| piriform cortex | The olfactory cortex, corresponding to the rostral half of the uncus; receiving its major afferents from the olfactory bulb, it is classified as allocortex. See: cerebral cortex. Synonym: olfactory cortex, piriform area. (05 Mar 2000) |
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| piriform fossa | A recess in the anterolateral wall of the nasopharynx on each side of the vestible of the larynx separated from it by the aryepiglottic folds. Synonym: recessus piriformis, piriform recess, piriform sinus. (05 Mar 2000) |
| piriform muscle | <anatomy, muscle> Origin, margins of pelvic sacral foramina and greater sciatic notch of ilium; insertion, upper border of greater trochanter; action, rotates thigh laterally; nerve supply, nerve to piriformis (sciatic plexus). Synonym: musculus piriformis, musculus pyriformis, piriform muscle. (05 Mar 2000) |
| piriform neuron layer | The layer of Purkinje cells between the molecular and granular layers of the cerebellar cortex. Synonym: stratum neuronorum piriformium, ganglionic layer of cerebellar cortex, layer of piriform neurons, Purkinje's layer, stratum gangliosum cerebelli. (05 Mar 2000) |
| piriform opening | The anterior nasal opening in the skull. Synonym: apertura piriformis, piriform opening. (05 Mar 2000) |
| piriform recess | A recess in the anterolateral wall of the nasopharynx on each side of the vestible of the larynx separated from it by the aryepiglottic folds. Synonym: recessus piriformis, piriform recess, piriform sinus. (05 Mar 2000) |
| piriform sinus | A recess in the anterolateral wall of the nasopharynx on each side of the vestible of the larynx separated from it by the aryepiglottic folds. Synonym: recessus piriformis, piriform recess, piriform sinus. (05 Mar 2000) |
| piriformis | <anatomy, muscle> Origin, margins of pelvic sacral foramina and greater sciatic notch of ilium; insertion, upper border of greater trochanter; action, rotates thigh laterally; nerve supply, nerve to piriformis (sciatic plexus). Synonym: musculus piriformis, musculus pyriformis, piriform muscle. (05 Mar 2000) |
| pirinitramide | <chemical> 1'-(3-cyano-3,3-diphenylpropyl)-(1,4'-bipiperidine)-4'-carboxamide. A diphenylpropylamine with intense narcotic analgesic activity of long duration. It is a derivative of meperidine with similar activity and usage. Pharmacological action: analgesics, opioid, narcotics. Chemical name: (1,4'-Bipiperidine)-4'-carboxamide, 1'-(3-cyano-3,3-diphenylpropyl)- (12 Dec 1998) |
| piririgua | <zoology> A South American bird (Guira guira) allied to the cuckoos. Origin: From the native name. Source: Websters Dictionary (01 Mar 1998) |
| pirl | 1. To spin, as a top. 2. To twist or twine, as hair in making fishing lines. Origin: Cf. Purl. Source: Websters Dictionary (01 Mar 1998) |
| pirn | A quill or reed on which thread or yarn is wound; a bobbin; also, the wound yarn on a weaver's shuttle; also, the reel of a fishing rod. Origin: Etymol. Uncertain. Source: Websters Dictionary (01 Mar 1998) |
| Pirogoff's amputation | Amputation of the foot; the lower articular surfaces of the tibia and fibula are sawed through and the ends covered with a portion of the os calcis which has also been sawed through from above posteriorly downward and forward. (05 Mar 2000) |
| Pirogoff's angle | The junction of the internal jugular and subclavian veins, toward which converge the external and the anterior jugular and the vertebral veins, the thoracic duct in the left angle and the right lymphatic duct in the right angle. Synonym: Pirogoff's angle. In neuroradiology, the angle of union of the superior thalamostriate vein (vena terminalis) with the internal cerebral vein, usually closely behind the interventricular foramen of Monro. (05 Mar 2000) |
| Pirogoff's triangle | A triangle formed by the intermediate tendon of the digastric muscle, the posterior border of the mylohyoid muscle, and the hypoglossal nerve. (05 Mar 2000) |