| postlaminar part of optic nerve | <anatomy, nerve> The portion of the optic nerve posterior to the lamina cribrosa of the sclera. Synonym: pars postlaminaris nervi optici. (05 Mar 2000) |
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| postsulcal part of tongue | See: dorsum of tongue. (05 Mar 2000) |
| cupular part of epitympanic recess | The dome-shaped, highest portion of the epitympanic recess. Synonym: pars cupularis recessus epitympanici. (05 Mar 2000) |
| precommunical part of anterior cerebral artery | precommunical part of anterior cerebral artery |
| prelaminar part of optic nerve | <anatomy, nerve> The portion of the optic nerve anterior to the lamina cribrosa of the sclera. Synonym: pars prelaminaris nervi optici. (05 Mar 2000) |
| presulcal part of tongue | See: dorsum of tongue. (05 Mar 2000) |
| prevertebral part of vertebral artery | See: vertebral artery. (05 Mar 2000) |
| sacral part of spinal cord | The part of the cord from which consists of the five sacral segments of the spinal cord (S1-S5) and from which five pairs of sacral nerves originate. Synonym: pars sacralis medullae spinalis, segmenta medullae spinalis sacralia. (05 Mar 2000) |
| sarcoma, alveolar soft part | A variety of sarcoma having a reticulated fibrous stroma enclosing groups of sarcoma cells, which resemble epithelial cells and are enclosed in alveoli walled with connective tissue. It is a rare tumour, usually occurring between 15 and 35 years of age. It appears in the muscles of the extremities in adults and most commonly in the head and neck region of children. Though slow-growing, it commonly metastasizes to the lungs, brain, bones, and lymph nodes. (12 Dec 1998) |
| hidden part | <anatomy> An obsolete term, pars tecta duodeni, the part of duodenum covered by the root of the transverse mesocolon, the coalescence of the ascending mesocolon, and the root of the mesentery, pars tecta pancreatis, hidden portion of the pancreas; part of the pancreas covered by the root of the transverse mesocolon, the coalescence of the ascending mesocolon, and the root of the mesentery, pars tecta renalis, hidden portion of the kidney; part of the kidney covered by the root of the transverse mesocolon, pars tecta ureteralis, hidden portion of the ureter; part of the right ureter covered (crossed) by the root of the mesentery, and of the left ureter covered (crossed) by the root of the sigmoid mesocolon. Synonym: hidden part. (05 Mar 2000) |
| pterygopharyngeal part of superior constrictor muscle of pharynx | pterygopharyngeal part of superior constrictor muscle of pharynx |
| horizontal part of duodenum | pars horizontalis duodeni, inferior part of duodenum, pars inferior duodeni |
| horizontal part of facial canal | First portion of facial canal, between beginning of canal (at the introitus of the facial canal at the end of the internal auditory meatus) and the point at which it turns to descend, beginning the descending part. There are two components (crura) of the horizontal part: the medially-located, anteriorly-directed medial crus and the laterally-placed, posteriorly-directed lateral crus, the two being continuous at a sharp bend, the genu of the facial canal. This lateral part is where the genicular ganglion is located and which communicates with the middle cranial fossa via the hiatus of the facial canal, through which the greater superficial petrosal nerve passes. (05 Mar 2000) |
| sphenoidal part of middle cerebral artery | sphenoidal part of middle cerebral artery |
| spinal part of accessory nerve | <anatomy, nerve> Originates from the upper five or six cervical spinal segments, emerges from the lateral surface of the spinal cord and ascends through the foramen magnum to join the cranial root. Synonym: radices spinales nervi accessorii, ramus externus nervi accessorii, pars spinalis nervi accessorii, spinal part of accessory nerve. (05 Mar 2000) |