| external inguinal ring | The slit-like opening in the aponeurosis of the external oblique muscle of the abdominal wall through which the spermatic cord (round ligament in the female) and inguinal hernias emerge from the inguinal canal. See: aponeurosis of external abdominal oblique muscle. Synonym: annulus inguinalis superficialis, external inguinal ring, subcutaneous ring. (05 Mar 2000) |
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| lateral crus of the superficial inguinal ring | Portion of the external oblique aponeurosis which passes lateral to the superficial inguinal ring blending into the inguinal ligament and forming the lateral boundary of the ring. Synonym: crus laterale anuli inguinalis superficialis. (05 Mar 2000) |
| lateral inguinal fossa | A depression on the peritoneal surface of the anterior abdominal wall lateral to the ridge formed by the inferior epigastric artery; it corresponds to the position of the deep inguinal ring, and is the site of an indirect inguinal hernia. Synonym: fossa inguinalis lateralis. (05 Mar 2000) |
| amniotic fold | A fold of amniotic membrane enclosing the yolk stalk and extending from the point of insertion of the umbilical cord to the yolk sac; in reptiles and birds it is the reflected edge of the amnion where it folds over to cover the embryo during early development. Synonym: Schultze's fold. (05 Mar 2000) |
| anterior axillary fold | Bounds axilla anteriorly; formed by skin and fascia overlying inferior border of pectoralis major muscle. (05 Mar 2000) |
| aryepiglottic fold | A prominent fold of mucous membrane stretching between the lateral margin of the epiglottis and the arytenoid cartilage on either side; it encloses the aryepiglottic muscle. Synonym: plica aryepiglottica. (05 Mar 2000) |
| axillary fold | One of the folds of skin and muscular tissue bounding the axilla anteriorly and posteriorly. Synonym: plica axillaris. (05 Mar 2000) |
| palpebronasal fold | A fold of skin that comes down across the inner angle of the eye. The epicanthal fold is more common in children with Down syndrome and other birth defects than normal children and so is of value in diagnosis. Although some dictionaries state that this eye fold is found in peoples of Asian origin, this is not true. The normal Asian eyefold is continuous with the lower edge of the upper eyelid and actually appears distinctly different than a true epicanthal fold. (12 Dec 1998) |
| vascular fold of the caecum | <anatomy> A peritoneal fold that arches over a branch of the ileocolic artery and bounds in front a narrow recess, the superior ileocaecal (or ileocolic) recess. Synonym: plica caecalis vascularis. (05 Mar 2000) |
| malar fold | An ill-defined groove in the skin that extends downward and medially from the lateral canthus. (05 Mar 2000) |
| Vater's fold | A fold of mucous membrane in the duodenum just above the greater duodenal papilla. (05 Mar 2000) |
| mallear fold | One of two ligamentous bands, anterior and posterior, making folds on the tympanic side of the tympanic membrane extending from each extremity of the tympanic notch to the malleolar prominence; they mark the boundary between the tense and the flaccid portions of the tympanic membrane. Synonym: plica mallearis, plica membranae tympani, Troltsch's fold. (05 Mar 2000) |
| mammary fold | Bandlike thickening of ectoderm in the embryo extending on either side from just below the axilla to the inguinal region; in human embryos, the mammary glands arise from primordia in the thoracic part of the ridge, the balance of the ridge disappearing; in some lower mammals which give birth to a litter of young, several milk glands develop along these lines. Synonym: mammary fold, milk line, milk ridge. (05 Mar 2000) |
| paraduodenal fold | A sickle-shaped fold of peritoneum sometimes found arching between the left side of the duodenojejunal flexure and the medial border of the left kidney; its right free edge contains the ascending branch of the left colic artery and inferior mesenteric vein; forms anterior boundary of the paraduodenal recess. See: paraduodenal recess. Synonym: plica paraduodenalis, Treitz's arch. (05 Mar 2000) |
| ventricular fold | One of the pair of folds of mucous membrane stretching across the laryngeal cavity from the angle of the thyroid cartilage to the arytenoid cartilage; they enclose a space called the rima vestibuli or false glottis. Synonym: plica vestibularis, false vocal cord, plica ventricularis, ventricular band of larynx, ventricular fold. (05 Mar 2000) |