| PAR | participating provider; passive avoidance reaction; perennial allergic rhinitis; photosynthetically ... |
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| PAV | percutaneous aortic valvuloplasty; poikiloderma atrophicans vasculare; posterior arch vein; proporti... |
| PBW | posterior bite wing |
| PCD | pacer-cardioverter-defibrillator; papillary collecting duct; paraneoplastic cerebellar degeneration;... |
| PCF | peripheral circulatory failure; pharyngoconjunctival fever; platelet complement fixation; posterior ... |
| posterior labial veins | They pass posteriorly from the labia majora and minora to the internal pudendal veins. Synonym: venae labiales posteriores. (05 Mar 2000) |
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| posterior lacrimal crest | A vertical ridge on the orbital surface of the lacrimal bone which, together with the anterior lacrimal crest, bounds the fossa for the lacrimal sac. Synonym: crista lacrimalis posterior. (05 Mar 2000) |
| posterior lateral nasal arteries | Branches of the sphenopalatine artery that supply the posterior parts of the conchae and lateral nasal wall. Synonym: arteriae nasales posteriores laterales. (05 Mar 2000) |
| posterior layer of rectus abdominis sheath | The portion of the sheath of the rectus abdominis muscle that lies posterior to the muscle covering only its upper two-thirds; it is formed by contributions from the aponeuroses of the internal oblique and transversus abdominis muscles; its free inferior margin forms the arcuate line; it is deficient below this, the posterior aspect of the muscle being covered only by transversalis fascia and peritoneum. Synonym: lamina posterior vaginae musculi recti abdominis. (05 Mar 2000) |
| posterior ligament of head of fibula | A ligament uniting the posterior part of the head of the fibula to the tibia. Synonym: ligamentum capitis fibulae posterius. (05 Mar 2000) |
| posterior ligament of incus | Ligamentous band extending from short crus of fincus. Synonym: ligamentum incudis posterius. (05 Mar 2000) |
| posterior ligament of knee | <anatomy> A broad fibrous band attached above to the lateral condyle of the femur and passing medially and downward, blending with the posterior part of the fibrous capsule of the knee joint, arching over the tendon of the popliteus muscle. Synonym: ligamentum popliteum arcuatum, popliteal arch, posterior ligament of knee. (05 Mar 2000) |
| posterior limb of internal capsule | That subdivision of the internal capsule caudal to the genu between the thalamus and lentiform nucleus. Synonym: crus posterius capsulae internae. (05 Mar 2000) |
| posterior limb of stapes | The posterior of the two delicate limbs of the stapes that connect the head and base or footplate of the bone. Synonym: crus posterius stapedis, posterior limb of stapes. (05 Mar 2000) |
| posterior limiting layer of cornea | A transparent homogeneous acellular layer between the substantia propria and the endothelial layer of the cornea; considered to be a highly developed basement membrane. Synonym: lamina limitans posterior corneae, membrana vitrea, Descemet's membrane, Duddell's membrane, entocornea, hyaloid membrane, lamina elastica posterior, limiting layers of cornea, membrana hyaloidea, posterior elastic layer, tunica vitrea, vitreous membrane. (05 Mar 2000) |
| posterior lip of uterine os | The portion of the uterine cervix that bounds the ostium posteriorly. It is slightly longer than labium anterius, intervening between the cervical canal and the posterior fornix of the vagina. Synonym: labium posterius ostii uteri. (05 Mar 2000) |
| posterior lobe of hypophysis | It is composed of the infundibulum and the nervous lobe of hypophysis. See: hypophysis. Synonym: lobus posterior hypophyseos, neural part of hypophysis, pars nervosa hypophyseos, posterior lobe of hypophysis. Origin: neuro-+ hypophysis (05 Mar 2000) |
| posterior longitudinal bundle | A longitudinal bundle of fibres extending from the upper border of the mesencephalon into the cervical segments of the spinal cord, located close to the midline and ventral to the central gray matter; it is composed largely of fibres from the vestibular nuclei ascending to the motor neurons innervating the external eye muscles (abducens, trochlear, and oculomotor nuclei), and descending to spinal cord segments innervating the musculature of the neck. Synonym: fasciculus longitudinalis medialis, Collier's tract, medial longitudinal bundle, posterior longitudinal bundle. (05 Mar 2000) |
| posterior longitudinal ligament | <anatomy> The fibrous band interconnecting the posterior surfaces of the vertebral bodies; it narrows to pass between the pedicles and spreads out to blend with the posterior annulus fibrosus of the intervertebral discs; forms the anterior wall of the vertebral canal. Synonym: ligamentum longitudinale posterius. (05 Mar 2000) |
| posterior lunate lobule | The part of the superior surface of the cerebellar hemisphere lying behind the horizontal fissure. Synonym: lobulus semilunaris inferior, crus II, posterior lunate lobule. (05 Mar 2000) |