pelvis

(redirected from giant pelvis)
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to giant pelvis: pelvis justo major

pelvis

 [pel´vis] (L.)
1. any basinlike structure in the body.
2. the bony pelvis, the lower (caudal) portion of the trunk of the body, forming a basin bounded anteriorly and laterally by the hip bones and posteriorly by the sacrum and coccyx; it is formed by the sacrum, the coccyx, and the ilium, pubis, and ischium, bones that also form the hip and the pubic arch. These bones are separate in the child, but become fused by adulthood. The pelvis is subjected to more stress than any other body structure. Its upper part, which is somewhat flared, supports the weight of internal organs in the upper part of the body. The floor of the pelvis or pelvic floor is the layer of tissue just below the outlet, formed by the coccygeal and levator ani muscles and the perineal fascia.

Pelvic structures in men and women differ both in shape and in relative size. The male pelvis is heart-shaped and narrow and proportionately heavier and stronger than that of the female, so that it is better suited for lifting and running. The female pelvis is constructed to accommodate the fetus during pregnancy and to facilitate its downward passage through the pelvic cavity in childbirth. The most obvious difference between the male and female pelvis is in the shape. A woman's hips are wider and her pelvic cavity is round and relatively large. There are differences in the shape of the female pelvis, which must be taken into account in childbirth. During pregnancy the capacity of the pelvis and the pelvic diameters are measured, so that possible complications during labor can be anticipated.
Dynamic pelvic floor imaging using MRI. MR sequences can now be acquired every half-second or so and this rapidity allows functional studies of the gastrointestinal tract to be undertaken. A and B, These sagittal views can be used to measure pelvic floor descent as well as to give valuable information on the local anatomy. C, Diagrammatic baseline sagittal view. (1 = pubococcygeal baseline; 2 = bladder base descent; 3 = uterocervical descent; 4 = anorectal junction descent.) From Aspinal and Taylor-Robinson, 2001.
Various types of pelvic inlets.
android pelvis one with a wedge-shaped inlet and narrow anterior segment typically found in the male.
anthropoid pelvis one whose anteroposterior diameter equals or exceeds the transverse diameter.
assimilation pelvis one in which the ilia articulate with the vertebral column higher (high assimilation pelvis) or lower (low assimilation pelvis) than normal, the number of lumbar vertebrae being correspondingly decreased or increased.
beaked pelvis one with the pelvic bones laterally compressed and their anterior junction pushed forward.
brachypellic pelvis a short oval type of pelvis, in which the transverse diameter exceeds the anteroposterior diameter by 1 to 3 cm.
contracted pelvis one showing a decrease of 1.5 to 2 cm in an important diameter; when all dimensions are proportionately diminished, it is a generally contracted pelvis.
cordate pelvis a heart-shaped pelvis.
dolichopellic pelvis a long, oval pelvis with the anteroposterior diameter greater than the transverse diameter.
extrarenal pelvis see renal pelvis.
false pelvis pelvis major.
flat pelvis one in which the anteroposterior dimension is abnormally reduced.
frozen pelvis a condition, due to infection or carcinoma, in which the adnexa and uterus are fixed in the pelvis.
funnel pelvis one with a normal inlet but a greatly narrowed outlet.
greater pelvis pelvis major.
gynecoid pelvis the normal female pelvis: a rounded oval pelvis with well rounded anterior and posterior segments.
infantile pelvis a generally contracted pelvis with an oval shape, a high sacrum, and inclination of the walls; called also juvenile pelvis.
pelvis jus´to ma´jor an unusually large gynecoid pelvis, with all dimensions increased.
pelvis jus´to mi´nor a small gynecoid pelvis, with all dimensions symmetrically reduced.
juvenile pelvis infantile pelvis.
kyphotic pelvis a deformed pelvis marked by increase of the conjugate diameter at the brim with decrease of the transverse diameter at the outlet.
lesser pelvis pelvis minor.
pelvis ma´jor the part of the pelvis superior to a plane passing through the ileopectineal lines. Called also false pelvis and greater pelvis.
pelvis mi´nor the part of the pelvis inferior to a plane passing through the ileopectineal lines. Called also lesser pelvis and true pelvis.
Nägele's pelvis one contracted in an oblique diameter, with complete ankylosis of the sacroiliac synchondrosis on one side and imperfect development of the sacrum and coxa on the same side.
Otto pelvis one in which the acetabulum is depressed, accompanied by protrusion of the femoral head into the pelvis.
platypellic pelvis (platypelloid pelvis) one shortened in the anteroposterior aspect, with a flattened transverse, oval shape.
rachitic pelvis one distorted as a result of rickets.
renal pelvis the funnel-shaped expansion of the upper end of the ureter into which the renal calices open; it is usually within the renal sinus, but under certain conditions a large part of it may be outside the kidney (extrarenal pelvis).
scoliotic pelvis one deformed as a result of scoliosis.
split pelvis one with a congenital separation at the symphysis pubis.
spondylolisthetic pelvis one in which the last, or rarely the fourth or third, lumbar vertebra is dislocated in front of the sacrum, more or less occluding the pelvic brim.
true pelvis pelvis minor.

pel·vis

, pl.

pel·ves

(pel'vis, pel'vēz), [TA]
1. The massive cup-shaped ring of bone, with its ligaments, at the inferior end of the trunk, formed of the hip bone (the pubic bone, ilium, and ischium) on either side and in front of the sacrum and coccyx, posteriorly.
2. Any basinlike or cup-shaped cavity, such as the pelvis of the kidney.
[L. basin]

pelvis

/pel·vis/ (pel´vis) pl. pel´ves   [L.] the lower (caudal) portion of the trunk, bounded anteriorly and laterally by the two hip bones and posteriorly by the sacrum and coccyx. Also applied to any basinlike structure, e.g., the renal pelvis.pel´vic
android pelvis  one with a wedge-shaped inlet and narrow anterior segment; used to describe a female pelvis with characteristics usually found in the male.
anthropoid pelvis  a female pelvis in which the anteroposterior diameter of the inlet equals or exceeds the transverse diameter.
assimilation pelvis  one in which the ilia articulate with the vertebral column higher (high assimilation p.) or lower (low assimilation p.) than normal, the number of lumbar vertebrae being correspondingly decreased or increased.
beaked pelvis  one with the pelvic bones laterally compressed and their anterior junction pushed forward.
brachypellic pelvis  one in which the transverse diameter exceeds the anteroposterior diameter by 1 to 3 cm.
contracted pelvis  one showing a decrease of 1.5 to 2 cm in any important diameter; when all dimensions are proportionately diminished it is a generally contracted p. (p. justo minor).
dolichopellic pelvis  an elongated pelvis, the anteroposterior diameter being greater than the transverse diameter.
extrarenal pelvis  see renal p.
false pelvis  the part of the pelvis superior to a plane passing through the iliopectineal lines.
flat pelvis  one in which the anteroposterior dimension is abnormally reduced.
funnel-shaped pelvis  one with a normal inlet but a greatly narrowed outlet.
gynecoid pelvis  the normal female pelvis: a rounded oval pelvis with well-rounded anterior and posterior segments.
infantile pelvis  a generally contracted pelvis with an oval shape, high sacrum, and marked inclination of the walls.
pelvis jus´to ma´jor  an unusually large gynecoid pelvis, with all dimensions increased.
pelvis jus´to mi´nor  a small gynecoid pelvis, with all dimensions symmetrically reduced; see also contracted p.
juvenile pelvis  infantile p.
pelvis ma´jor  false p.
mesatipellic pelvis  one in which the transverse diameter is equal to the anteroposterior diameter or exceeds it by no more than 1 cm.
pelvis mi´nor  true p.
platypellic pelvis , platypelloid pelvis one shortened in the anteroposterior aspect, with a flattened transverse oval shape.
rachitic pelvis  one distorted as a result of rickets.
renal pelvis  the funnel-shaped expansion of the upper end of the ureter into which the renal calices open; it is usually within the renal sinus, but under certain conditions a large part of it may be outside the kidney (extrarenal p.) .
scoliotic pelvis  one deformed as a result of scoliosis.
split pelvis  one with a congenital separation at the pubic symphysis.
spondylolisthetic pelvis  one in which the last, or rarely the fourth or third, lumbar vertebra is dislocated in front of the sacrum, more or less occluding the pelvic brim.
true pelvis  the part of the pelvis inferior to a plane passing through the iliopectineal lines.

pelvis

(pĕl′vĭs)
n. pl. pel·vises or pel·ves (-vēz)
1. A basin-shaped structure of the skeleton of many vertebrates, composed in humans of the hipbones on the sides, the pubis in front, and the sacrum and coccyx behind, that rests on the lower limbs and supports the spinal column.
2. The cavity formed by this structure.

pelvis

[pel′viz] pl. pelves
Etymology: L, basin
the lower part of the trunk of the body, composed of four bones, the two innominate bones laterally and ventrally and the sacrum and coccyx posteriorly. It is divided into the greater, or false, pelvis and the lesser, or true, pelvis by an oblique plane passing through the sacrum and the pubic symphysis. The greater pelvis is the expanded part of the cavity situated cranially and ventrally to the pelvic brim. The lesser pelvis is situated distally to the pelvic brim, and its bony walls are more complete than those of the greater pelvis. The inlet and outlet of the pelvis have three important diameters: anteroposterior, oblique, and transverse. The pelvis of a woman is usually less massive but wider and more circular than that of a man. Also called true pelvis. pelvic, adj.
enlarge picture
Comparison of male and female bony pelvis

pel·vis

, pl. pelves (pel'vis, -vēz) [TA]
1. The massive, cup-shaped ring of bone, with its ligaments, at the lower end of the trunk, formed of the hip bone (the pubic bone, ilium, and ischium) on either side and in front, and of the sacrum and the coccyx posteriorly.
2. Any basinlike or cup-shaped cavity, as the pelvis of the kidney.
[L. basin]

pelvis

(pel'vis) (pel'vez?) (pel'vi-sez) plural.pelvespelvises [L. pelvis, basin]
1. A basin-shaped structure or cavity.
Enlarge picture
PELVIS
2. The bony compartment comprising the innominate bones, the sacrum, and the coccyx, joined at the symphysis pubis, sacroiliac, and sacrococcygeal articulations by a network of cartilage and ligaments. The structure supports the vertebral column and articulates with the lower limbs. See: illustration
3. The cavity encompassed by the innominate bones, the sacrum, and the coccyx.

Anatomy

The pelvis is separated into a false or superior pelvis and a true or inferior pelvis by the iliopectineal line and the upper margin of the symphysis pubis. The circumference of this area constitutes the inlet of the true pelvis. The lower border of the true pelvis, termed the outlet, is formed by the coccyx, the protuberances of the ischia, the ascending rami of the ischia, and the descending rami of the ossa pubis and the sacrosciatic ligaments. The floor of the pelvis is formed by the perineal fascia, the levator ani, and the coccygeus muscles. All diameters normally are larger in the female than in the male.

External Diameters

Interspinous: The distance between the outer edges of the anterosuperior iliac spines, the diameter normally measuring 26 cm (1014 in.). Intercristal: The distance between the outer edges of the most prominent portion of the iliac crests, the diameter normally being 28 cm (11 in.). Intertrochanteric: The distance between the most prominent points of the femoral trochanters, 32 cm (1212 in.). Oblique (right and left): The distance from one posterosuperior iliac spine to the opposite anterosuperior iliac spine, 22 cm (812 in.), the right being slightly greater than the left. External conjugate: The distance from the undersurface of the spinous process of the last lumbar vertebra to the upper margin of the anterior surface of the symphysis pubis, 20 cm (778 in.).

Internal Diameters

True conjugate: The anteroposterior diameter of the pelvic inlet, 11 cm (414 in.), the most important single diameter of the pelvis. Diagonal conjugate: The distance between the promontory of the sacrum to the undersurface of the symphysis pubis, 13 cm (518 in.). Two cm (34 in.) are deducted for the height and inclination of the symphysis pubis to obtain the diameter of the conjugate. Transverse: The distance between the ischial tuberosities, 11 cm (414 in.). Anteroposterior (of outlet): The distance between the lower border of the symphysis pubis and the tip of the sacrum, 11 cm (414 in.). Anterior sagittal: The distance from the undersurface of the symphysis pubis to the center of the line between the ischial tuberosities, 7 cm (234 in.). Posterior sagittal: The distance from the center of line between the ischial tuberosities to the tip of the sacrum, 10 cm (4 in.).

pelvis aequabiliter justo major

A pelvis that is symmetrically larger than the standard in all its dimensions. Synonym: giant pelvis

pelvis aequabiliter justo minor

A pelvis with all its dimensions uniformly smaller than the standard. Synonym: reduced pelvis

android pelvis

The normal shape of the male pelvis. About 30% of women share this bony configuration; however, the heart-shaped inlet, convergent sidewalls, slanted sacrum, and narrow sacrosciatic notch pose problems for childbearing. The narrowed dimensions increase the risk of fetopelvic disproportion, obstructed labor, and cesarean delivery. Synonym: masculine pelvis

anthropoid pelvis

A deviation from the normal gynecoid configuration of the pelvic bones in which the anterior-posterior diameter is greater than the transverse diameter. It is found in approximately 20% of women. Deviations from the normal gynecoid configuration include a long, oval, narrow inlet and narrow sacrum, straight sidewalls, and a wide sacrosciatic notch. The shape increases the potential for fetal posterior positions during childbearing.

assimilation pelvis

A structural abnormality that results from a developmental lumbosacral fusion or from a sacrococcygeal fusion.

beaked pelvis

A pelvis with the pelvic bones laterally compressed and pushed forward so that the outlet is narrow and long. Synonym: rostrate pelvis; triradiate pelvis

bony pelvis

The skeleton of the pelvis, consisting of the right and left hip bones (each made of an ilium, an ischium, and a pubis), the sacrum, and the coccyx.

brachypellic pelvis

An oval pelvis in which the transverse diameter is at least 1 cm longer, but no more than 3 cm longer, than the anteroposterior diameter of the pelvis.

brim of the pelvis

Brim (2).

contracted pelvis

A pelvis in which one or more of the principal diameters is reduced to a degree that parturition is impeded.

cordate pelvis

A pelvis possessing a heart-shaped inlet.

coxalgic pelvis

A pelvis deformed subsequent to hip joint disease.

dolichopellic pelvis

An abnormal pelvis in which the anteroposterior diameter is greater than the transverse diameter.

dwarf pelvis

An unusually small pelvis in which all diameters are symmetrically reduced.

elastic pelvis

Osteomalacic pelvis.

extrarenal pelvis

A renal pelvis located outside the kidney.

false pelvis

The portion of the pelvic cavity that lies above the pelvic brim, bounded by the linea terminalis and the iliac fossae. It supports the weight of the growing uterus during the middle and last trimesters of pregnancy.
Synonym: pelvis major

fissured pelvis

A structural malformation in which the ilia are pushed forward to an almost parallel position; caused by rickets.

flat pelvis

A pelvis in which the anteroposterior diameters are shortened.

frozen pelvis

Adhesion of the female reproductive organs to the peritoneum or bowel by cancer, endometriosis, or pelvic infection.

funnel-shaped pelvis

A pelvis in which the outlet is considerably contracted but the inlet dimensions are normal.

giant pelvis

Pelvis aequabiliter justo major.

gynecoid pelvis

A normal female pelvis. Relative to the male pelvis, it has a wider bone structure and a more oval shape.

halisteretic pelvis

A deformed pelvis resulting from softening of bones because of osteomalacia..

infantile pelvis

An adult pelvis that retains its infantile characteristics. Synonym: juvenile pelvis

pelvis justo major

An unusually large pelvis.

juvenile pelvis

Infantile pelvis.

kyphoscoliotic pelvis

A deformed pelvis caused by rickets.

kyphotic pelvis

A deformed pelvis characterized by an increase of the conjugate diameter at the brim with reduction of the transverse diameter at the outlet.

lordotic pelvis

A deformed pelvis in which the spinal column has an anterior curvature in the lumbar region.

pelvis major

False pelvis.

masculine pelvis

A female pelvis that resembles a male pelvis, esp. in that it is narrower, more conical, and heavier-boned and has a heart-shaped inlet. Synonym: android pelvis

pelvis minor

True pelvis.

pelvis obtecta

A deformed pelvis in which the vertebral column extends across the pelvic inlet.

osteomalacic pelvis

A pelvis distorted because of osteomalacia. Synonym: elastic pelvis

Otto pelvis

See: Otto pelvis

platypellic pelvis

A rare structural malformation that resembles a flattened gynecoid pelvis with shortened anteroposterior and wide transverse diameters.

pseudo-osteomalacic pelvis

A rachitic pelvis similar to that of a person with osteomalacia.

rachitic pelvis

A pelvis deformed from rickets.

reduced pelvis

Pelvis aequabiliter justo minor.

renal pelvis

The expanded proximal end of the ureter. It is within the renal sinus of the kidney and receives the urine through the major calyces.

reniform pelvis

A pelvis shaped like a kidney.

Robert pelvis

See: Robert pelvis

rostrate pelvis

Beaked pelvis.

pelvis rotunda

A tympanic depression in the inner wall, at the bottom of which is the fenestra rotunda.

round pelvis

A pelvis with a circular inlet.

scoliotic pelvis

A deformed pelvis resulting from spinal curvature.

simple flat pelvis

A pelvis with a shortened anteroposterior diameter.

pelvis spinosa

A rachitic pelvis with a pointed pubic crest.
Synonym: Kilian pelvis

split pelvis

A pelvis with a congenital division at the symphysis pubis.

spondylolisthetic pelvis

A pelvis in which the last lumbar vertebra is dislocated in front of the sacrum, causing occlusion of the brim.

triradiate pelvis

Beaked pelvis.

true pelvis

The portion of the pelvis lying below the iliopectineal line. The dimensions of the true pelvis are of obstetrical significance in determining the success of fetal descent. Synonym: pelvis minor

pelvis

1. The basin-like bony girdle at the lower end of the spine with which the legs articulate. The pelvis consists of the SACRUM and COCCYX, behind, and the INNOMINATE bones on either side. Each innominate bone is made up of three bones-the pubis, the ilium and the ischium.
2. Any funnel-shaped structure such as the pelvis of the kidney.
Figure 1: The nervous system.
Figure 2: The brain viewed from the left showing the lobes of the cerebral hemisphere, the cerebellum and the lower parts of the brain stem in continuity with the spinal cord. Coloured area: the position of the ventricles, lying deep in the brain, containing cerebrospinal fluid and continuous with the central canal of the spinal cord.

pelvis

(from Latin meaning 'basin') the bony framework of the lowest part of the trunk, where the hip bonestogether with the sacrum and coccyx enclose the pelvic cavity, which is continuous above with the abdominal cavity. Each hip bone has three fused components: the ilium with a flared upper rim, the iliac crest, and linked to the sacrum at the sacroiliac joint; the ischium with the socket for the head of the femur (the acetabulum) at the hip joint; and the pubis which is attached to its partner at the pubic symphysis, centre front. See Figure 1, Figure 2.

pelvic girdle

; pelvis bowl-shaped bony girdle (formed by fusion of paired ischia, ilia and pubi, together with sacrum and coccyx); forming the articulation between trunk and lower limbs, and containing lower abdominal organs; frontal- and transverse-plane curvatures of the female pelvis are shallower than those of the male

pel·vis

, pl. pelves (pel'vis, -vēz) [TA]
Massive cup-shaped ring of bone, with its ligaments, at inferior end of the trunk, formed of hip bone (pubic bone, ilium, and ischium) on either side and in front of sacrum and coccyx, posteriorly.
[L. basin]

pelvis (pel´vis),

n the lower portion of the trunk of the body, composed of four bones, the two innominate bones laterally and ventrally and the sacrum and coccyx posteriorly.

pelvis

pl. pelves; the caudal portion of the trunk of the body, forming a basin bounded ventrally and laterally by the hip bones and dorsally by the sacrum and coccygeal vertebrae. Also applied to any basin-like structure, e.g. the renal pelvis.
The bony pelvis is formed by the sacrum, coccyx, ilium, pubis and ischium, bones that form the hip and pubic and sciatic arches.

android pelvis
one with a wedge-shaped inlet and narrow cranial segment typically found in the male.
extrarenal pelvis
see renal pelvis (below).
rachitic pelvis
one distorted as a result of rickets.
renal pelvis
the funnel-shaped expansion of the cranial end of the ureter; it is usually within the renal sinus, but under certain conditions, a large part of it may be outside the kidney (extrarenal pelvis).
split pelvis
one with a congenital separation at the symphysis pubis.
tipped pelvis
a tilted pelvis as occurs in cows and causes the external urinary meatus to be higher than the anterior pelvic floor so that urine accumulates in the vagina. See also urovagina.