| PION | posterior ischemic optic neuropathy |
|---|---|
| PIP | paralytic infantile paralysis; peak inflation pressure, peak inspiratory pressure; periodic interim ... |
| PLD | peripheral light detection; phospholipase D; platelet defect; polycystic liver disease; posterior la... |
| PLF | perilymphatic fistula; posterior lung fiber |
| PLL | peripheral light loss; phase-locked loop; poly-L-lysine; pressure length loop; posterior longitudina... |
| posterior nasal spine | The sharp posterior extremity of the nasal crest of the hard palate. Synonym: spina nasalis posterior, posterior palatine spine. (05 Mar 2000) |
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| posterior neck region | The back of neck, including the suboccipital region. Synonym: regio nuchalis, nuchal region, posterior neck region, regio cervicalis posterior. (05 Mar 2000) |
| posterior nephrectomy | Retroperitoneal removal of a kidney through an incision in the posterior lumbar muscles, usually with the patient in a prone position. (05 Mar 2000) |
| posterior neuropore | The temporary opening at the extreme caudal end of the neural tube in early embryos; closes at the 25th somite stage. Synonym: posterior neuropore. (05 Mar 2000) |
| posterior notch of cerebellum | A narrow notch between the cerebellar hemispheres posteriorly, occupied by the falx cerebelli. Synonym: incisura cerebelli posterior, marsupial notch, posterior notch of cerebellum. (05 Mar 2000) |
| posterior occipitoaxial ligament | A gelatinous membrane, attached to the bony spiral lamina, which overlies the hair cells within the cochlea of the inner ear. (12 Dec 1998) |
| posterior occlusion | The most effective contact of the molar and bicuspid teeth of both jaws which allows for all the natural movements of the jaws essential to normal mastication and closure. Synonym: posteroclusion. (05 Mar 2000) |
| posterior palatal seal | The seal at the posterior border of a denture. See: posterior palatal seal area. Synonym: palatal seal, post dam, postdam, postpalatal seal. (05 Mar 2000) |
| posterior palatal seal area | The soft tissues along the junction of the hard and soft palates on which pressure within the physiologic limits of the tissues can be applied by a denture to aid in the retention of the denture. Synonym: post dam area, postpalatal seal area. (05 Mar 2000) |
| posterior palatine arch | One of a pair of ridges or folds of mucous membrane which passes downward from the posterior margin of the soft palate to the lateral wall of the pharynx. It encloses the palatopharyngeus muscle and forms the posterior margin of the tonsillar fossa. It also demarcates the isthmus of fauces from oropharynx. Synonym: arcus palatopharyngeus, pharyngopalatine arch, posterior palatine arch, posterior pillar of fauces. (05 Mar 2000) |
| posterior palatine foramina | Openings on the hard palate of palatine canals passing vertically through the tuberosity of the palatine bone and transmitting the smaller palatine nerves and vessels. Synonym: foramina palatina minora, posterior palatine foramina. (05 Mar 2000) |
| posterior palatine spine | The sharp posterior extremity of the nasal crest of the hard palate. Synonym: spina nasalis posterior, posterior palatine spine. (05 Mar 2000) |
| posterior parolfactory sulcus | A shallow groove on the medial surface of the hemisphere demarcating the subcallosal gyrus or precommissural septum from the parolfactory area. Synonym: sulcus parolfactorius posterior. (05 Mar 2000) |
| posterior parotid veins | Branches draining part of the parotid gland and emptying into the retromandibular vein. Synonym: venae parotidea, posterior parotid veins. (05 Mar 2000) |
| posterior part | The posterior portion of the anterior commissure of the brain. (05 Mar 2000) |