| OP | occipitoparietal; occipitoposterior; occiput posterior; octapeptide; olfactory peduncle; opening pre... |
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| OPLL | ossification of posterior longitudinal ligament |
| PAL | pathology laboratory; peptidyl-alpha-hydroxyglycine alpha-amidating lysine phase alteration plane; p... |
| PAR | participating provider; passive avoidance reaction; perennial allergic rhinitis; photosynthetically ... |
| PAS | para aminosalicylate; Parent Attitude Scale; patient administration system; patient appointments and... |
| arteria communicans posterior | <anatomy, artery> Origin, internal carotid; distribution, optic tract, crus cerebri, interpeduncular region, and hippocampal gyrus; anastomoses, with posterior cerebral to form the cerebral arterial circle (circle of Willis). Synonym: arteria communicans posterior. (05 Mar 2000) |
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| arteria conjunctivalis posterior | <anatomy, artery> One of a series of branches from the arterial arches of the upper and lower eyelids that supplies the conjunctiva. Synonym: arteria conjunctivalis posterior, conjunctival arteries. (05 Mar 2000) |
| arteria ethmoidalis posterior | <anatomy, artery> Origin, ophthalmic; distribution, posterior ethmoidal cells and upper posterior part of lateral wall of nasal cavity. Synonym: arteria ethmoidalis posterior. (05 Mar 2000) |
| arteria interossea posterior | <anatomy, artery> Origin, common interosseous artery; distribution, posterior compartment of forearm. Synonym: arteria interossea posterior, dorsal interosseous artery. (05 Mar 2000) |
| arteria meningea posterior | <anatomy, artery> Origin, ascending pharyngeal; distribution, dura mater of posterior cranial fossa; anastomoses, branches of middle meningeal and vertebral. Synonym: arteria meningea posterior. (05 Mar 2000) |
| arteria nasalis posterior septi | A branch of the sphenopalatine artery that supplies the nasal septum and accompanies the nasopalatine nerve. Synonym: arteria nasalis posterior septi. (05 Mar 2000) |
| arteria parietales posterior | <anatomy, artery> The branch distributed to the posterior part of the parietal lobe. Synonym: arteria parietales posterior. (05 Mar 2000) |
| arteria recurrens tibialis posterior | <anatomy, artery> An inconstant branch of the posterior tibial artery which ascends anterior to the popliteus muscle, anastomoses with branches of the popliteal artery, and sends a twig to the tibiofibular joint. Synonym: arteria recurrens tibialis posterior. (05 Mar 2000) |
| arteria spinalis posterior | <anatomy, artery> Origin, vertebral; distribution, medulla, spinal cord, and pia mater; anastomoses, spinal branches of intercostal arteries. Synonym: arteria spinalis posterior. (05 Mar 2000) |
| arteria temporalis posterior | <anatomy, artery> A branch of the insular part of the middle cerebral artery distributed to the cortex of the posterior part of the temporal lobe. Synonym: arteria temporalis posterior. (05 Mar 2000) |
| arteria tibialis posterior | <anatomy, artery> The larger and more directly continuous of the two terminal branches of the popliteal; branches, peroneal, nutrient of fibula, lateral and medial posterior malleolar, nutrient of tibia, medial and lateral plantar. Synonym: arteria tibialis posterior. (05 Mar 2000) |
| arteria tympanica posterior | <anatomy, artery> Origin, stylomastoid; distribution, middle ear; anastomoses, other tympanic arteries. Synonym: arteria tympanica posterior. (05 Mar 2000) |
| artery of posterior segment of kidney | Origin, continuation of the posterior branch of renal. See: segmental arteries of kidney. Synonym: arteria segmenti posterioris renis, artery of posterior segment of kidney. (05 Mar 2000) |
| ascending posterior branch | The ascending posterior branch of the superior lobar branch of the right pulmonary artery. Synonym: ramus posterior ascendens. (05 Mar 2000) |
| bulb of posterior horn of lateral ventricle of brain | Bulb of posterior horn of lateral ventricle of the brain; a curved elevation on the inner wall of the posterior horn produced by the fibres of the forceps major of the corpus callosum as they bend backward into the occipital lobe. Synonym: bulb of posterior horn of lateral ventricle of brain. (05 Mar 2000) |