pelvic diaphragm

(redirected from diaphragma pelvis)

diaphragm

 [di´ah-fram]
1. the musculomembranous partition separating the thoracic and abdominal cavities. On its sides it is attached to the six lower ribs, at its front to the sternum, and at its back to the spine. The esophagus, aorta, vena cava, and numerous nerves pass through the diaphragm. When relaxed it is convex, but it flattens as it contracts during inhalation, thereby enlarging the chest cavity and allowing for expansion of the lungs. See also respiration.
2. any separating membrane or structure.
3. a disk with one or more openings or with an adjustable opening, mounted in relation to a lens or source of radiation, by which part of the light or radiation may be excluded from the area.
contraceptive diaphragm a shallow dome-shaped disk used as a contraceptive, made of a soft plastic material such as latex. Its anterior lip fits behind the symphysis pubis and its posterior lip rests in the posterior fornix. It is used with a spermicide to prevent entrance of spermatozoa into the cervical os. See also contraception.
pelvic diaphragm the portion of the floor of the pelvis formed by the coccygeus muscles and the levator ani muscles, and their fascia.
polyarcuate diaphragm one showing abnormal scalloping of margins on radiographic visualization.
urogenital diaphragm a traditional but no longer valid concept that superior and inferior layers enclose the sphincter urethrae and deep transverse perineal muscles and together form a musculomembranous sheet that extends between the ischiopubic rami.
vaginal diaphragm contraceptive diaphragm.

pel·vic di·a·phragm

[TA]
the paired levator ani and coccygeus muscles together with the fascia above and below them.

pelvic diaphragm

the inferior aspect of the body wall, stretched like a hammock across the pelvic cavity and comprising the levator ani and the coccygeus muscles. It holds the abdominal contents, supports the pelvic viscera, and is pierced by the anal canal, the urethra, and the vagina. It is reinforced by fasciae and muscles associated with these structures and with the perineum.

pel·vic di·a·phragm

, diaphragm of pelvis (pel'vik dī'ă-fram, pel'vis) [TA]
The paired levator ani and coccygeus muscles together with the fascia above and below them.

diaphragm

(di'a-fram?) [Gr. diaphragma, a partition]
1. A thin membrane as is used for dialysis.
2. In microscopy, an apparatus located beneath the opening in the stage and permitting regulation of the amount of light passing through the object.
Enlarge picture
CONTRACEPTIVE DIAPHRAGM
3. A rubber or plastic cup that fits over the cervix uteri, used for contraceptive purposes. See: illustration
Enlarge picture
MOVEMENT OF RIB CAGE AND DIAPHRAGM DURING RESPIRATION: A. Inspiration: Air drawn into lungs; B. Expiration: Air forced out of lungs
4. The dome-shaped skeletal muscle that separates the abdomen from the thoracic cavity with its convexity upward. It contracts to promote inhalation, flattening downward and permitting the lungs to expand. It relaxes to promote exhalation, rising to its dome-shaped position and compressing the lungs.

The origin of the diaphragm is the xiphoid process, the lower six costal cartilages, and the lumbar vertebrae. The diaphragm is directly superior to the liver, the stomach, the spleen, the adrenal glands, and the kidneys; the right side is slightly higher than the left. See: illustration; Boerhaave syndrome

Bucky diaphragm

See: Bucky, Gustav P.

hernia of diaphragm

A congenital or traumatic protrusion of abdominal contents through the diaphragm.

pelvic diaphragm

Pelvic floor.

Potter-Bucky diaphragm

Bucky diaphragm.

slit diaphragm

A gap between the foot processes of podocytes in the renal glomerulus, composed of a filter made of proteins that holds large molecules within the plasma but allows smaller soluble chemicals to pass with water into the urine.

urogenital diaphragm

The urogenital trigone, or triangular ligament. A musculofascial sheath that lies between the ischiopubic rami, it is superficial to the pelvic diaphragm. In males it surrounds the membranous urethra; in females, the vagina.
illustration

diaphragm

1. the musculomembranous partition separating the thoracic and abdominal cavities. On its sides, it is attached to the caudal ribs; ventrally to the sternum; at the back, to the spine. The esophagus, the aorta and vena cava, and nerves pass through the diaphragm. When relaxed, the diaphragm is convex but it flattens and moves caudally as it contracts during inhalation, thereby enlarging the chest cavity and allowing for expansion of the lungs. See also respiration.
2. any separating membrane or structure.
3. a disk with one or more openings or with an adjustable opening, mounted in relation to a lens, by which part of the light may be excluded from the area.
See also diaphragmatic.

Potter-Bucky diaphragm
see Potter-Bucky grid.
lightbeam diaphragm
an adjustable diaphragm which is used to cone down a light beam that indicates the dimensions of an x-ray beam and marks the position of the central ray.
pelvic diaphragm
the portion of the caudal wall of the pelvis formed by the coccygeus muscles, the levator ani muscles and fascia.
slit diaphragm
see filtration membrane.
urogenital diaphragm
the musculomembranous layer superficial to the pelvic diaphragm, extending between the ischiopubic rami and surrounding the urogenital ducts.