| pontine gray matter | The massive gray matter filling the basilar pons. The nuclei are of fairly homogeneous architecture and project to the cortex of the contralateral cerebellar hemisphere by way of the middle cerebellar peduncle. Their main afferents come from the entire extent of the cerebral neocortex by way of the longitudinal pontine bundles (corticopontine fibres); thus, the pontine nuclei form a major way-station in the impulse conduction from the cerebral cortex of one hemisphere to the posterior lobe of the opposite cerebellum. Synonym: nuclei pontis, pontine gray matter. (05 Mar 2000) |
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| pontine haemorrhage | Haemorrhage occurring in the substance of the pons, typically in hypertensive patients. (05 Mar 2000) |
| pontine nuclei | The massive gray matter filling the basilar pons. The nuclei are of fairly homogeneous architecture and project to the cortex of the contralateral cerebellar hemisphere by way of the middle cerebellar peduncle. Their main afferents come from the entire extent of the cerebral neocortex by way of the longitudinal pontine bundles (corticopontine fibres); thus, the pontine nuclei form a major way-station in the impulse conduction from the cerebral cortex of one hemisphere to the posterior lobe of the opposite cerebellum. Synonym: nuclei pontis, pontine gray matter. (05 Mar 2000) |
| pontine veins | Several veins running transversely on the pons to join the petrosal vein. Synonym: venae pontis, veins of pons. (05 Mar 2000) |
| pontis nervi trigeminalis nucleus | <anatomy, nerve> The term commonly used to designate the nucleus pontis nervi trigeminalis; located in pons lateral to the motor trigeminal nucleus; receives primary sensory (touch and pressure) input via the trigeminal nerve, projects to ventral posteromedial nucleus of thalamus. Synonym: nucleus sensorius principalis nervi trigemini, nucleus sensorius superior nervi trigemini, principal sensory nucleus of the trigeminus. (05 Mar 2000) |
| pontobulbar body | A collection of nerve cells in the lower part of the medulla oblongata forming a ridge which crosses the restiform body obliquely. Synonym: corpus pontobulbare. (05 Mar 2000) |
| pontocerebellar recess | The angle formed at the junction of cerebellum, pons, and medulla. Synonym: pontocerebellar recess. (05 Mar 2000) |
| pontomedullary groove | The transverse groove on the ventral aspect of the brainstem that demarcates the pons from the medulla oblongata; from its bottom the sixth, seventh, and eighth cranial nerves emerge. (05 Mar 2000) |
| pontoon | 1. A wooden flat-bottomed boat, a metallic cylinder, or a frame covered with canvas, India rubber, etc, forming a portable float, used in building bridges quickly for the passage of troops. 2. A low, flat vessel, resembling a barge, furnished with cranes, capstans, and other machinery, used in careening ships, raising weights, drawing piles, etc, chiefly in the Mediterranean; a lighter. Pontoon bridge, a bridge formed with pontoons. Pontoon train, the carriages of the pontoons, and the materials they carry for making a pontoon bridge. The French spelling ponton often appears in scientific works, but pontoon is more common form. Origin: F. Ponton (cf. It. Pontone), from L. Ponto, -onis, fr. Pons, pontis, a bridge, perhaps originally, a way, path: cf. Gr. Path, Skr. Path, pathi, panthan. Cf. Punt a boat. Source: Websters Dictionary (01 Mar 1998) |