| posterior tympanic artery | <anatomy, artery> Origin, stylomastoid; distribution, middle ear; anastomoses, other tympanic arteries. Synonym: arteria tympanica posterior. (05 Mar 2000) |
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| posterior urethra | The portion of urethra posterior to the urogenital diaphram (external sphincter). (05 Mar 2000) |
| posterior urethral valves | Anomalous folds occurring at the level of the seminal colliculus. Synonym: Amussat's valvula. (05 Mar 2000) |
| posterior urethritis | Inflammation of the membranous and prostatic portions of the urethra. (05 Mar 2000) |
| posterior uveitis | <pathology> Inflammation of the choroid, a membrane or coat of the eyeball. (27 Sep 1997) |
| posterior vaginal hernia | Downward displacement of Douglas' pouch. (05 Mar 2000) |
| posterior vaginismus | Spasmodic stenosis of the vagina caused by contraction of the levator ani muscle. (05 Mar 2000) |
| posterior vein of left ventricle | Arises on the diaphragmatic surface of the heart near the apex, runs to the left and parallel to the posterior interventricular sulcus, and empties in the coronary sinus. Synonym: vena posterior ventriculi sinistri. (05 Mar 2000) |
| posterior vein of septum pellucidum | Vein draining the posterior part of the transparent septum; it empties into the superior thalamostriate vein. Synonym: vena septi pellucidi posterior. (05 Mar 2000) |
| posterior vertebral scalloping | <radiology> A acromegaly achondroplasia, M Marfan syndrome mucopolysaccharidoses (Morquio disease, Hurler syndrome), E Ehlers-Danlos syndrome, N neurofibromatosis (12 Dec 1998) |
| posterior vitrectomy | Removal of the posterior cortical vitreous; sometimes the preretinal membranes are removed. (05 Mar 2000) |
| posterior wall of middle ear | It contains the opening into the mastoid antrum. Synonym: paries mastoideus cavi tympani, mastoid wall of middle ear, posterior wall of middle ear. (05 Mar 2000) |
| posterior wall of stomach | That part of the gastric wall that faces the omental bursa. Synonym: paries posterior gastris. (05 Mar 2000) |
| posterior wall of tympanic cavity | It contains the opening into the mastoid antrum. Synonym: paries mastoideus cavi tympani, mastoid wall of middle ear, posterior wall of middle ear. (05 Mar 2000) |
| posterior wall of vagina | It is longer than the anterior wall and has a low ridge in the midline throughout most of its length. Synonym: paries posterior vaginae. (05 Mar 2000) |