urogenital diaphragm (redirected from UG diaphragm)

diaphragm /di·a·phragm/ (di´ah-fram)

1. the musculomembranous partition separating the abdominal and thoracic cavities and serving as a major muscle aiding inhalation.

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.

4. a device of molded rubber or other soft plastic material, fitted over the uterine cervix before intercourse to prevent entrance of spermatozoa.diaphragmat´ic

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contraceptive diaphragm  diaphragm (4).

pelvic diaphragm  the portion of the floor of the pelvis formed by the coccygeal and levator ani muscles and their fasciae.

polyarcuate diaphragm  one showing abnormal scalloping of the margins on radiographic visualization.

Potter-Bucky diaphragm  see under grid.

respiratory diaphragm  diaphragm (1).

urogenital diaphragm  traditional but no longer valid concept that fascial layers enclose the sphincter urethrae and deep transverse perineal muscles and together form a musculomembranous sheet that extends between the ischiopubic rami.

vaginal diaphragm  diaphragm (4).

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urogenital diaphragm

n.

A triangular sheet of muscle between the ischiopubic rami, composed of the sphincter muscle of the urethra and the deep transverse muscles of the perineum.

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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.

4. contraceptive diaphragm.

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.

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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.

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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.