pelvis (redirected from assimilation pelvis)

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

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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.

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pel·vis (plvs)

n. pl. pel·vis·es or pel·ves (-vz)

1. A basin-shaped structure of the vertebrate skeleton, composed of the innominate bones 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.

3. A basinlike or cup-shaped anatomical cavity.

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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.

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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.

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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.

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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.