| nuclei pontis | 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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| fasciculus obliquus pontis | A bundle of fibres in the ventral surface of the pons running from the anterior mesial portion outward and backward. Synonym: fasciculus obliquus pontis, oblique bundle of pons. (05 Mar 2000) |
| fibrae arcuatae cerebri | Short association fibres that connect adjacent gyri in the cerebral cortex. Synonym: fibrae arcuatae cerebri. (05 Mar 2000) |
| fibrae arcuatae externae | They include: 1) dorsal external arcuate fibres that arise from cells in the accessory or lateral cuneate nucleus and pass to the cerebellum; 2) ventral external arcuate fibres that arise from the arcuate nuclei at the base of the medulla oblongata and pass around the lateral surface of the medulla; both enter the cerebellum as components of the restiform portion of the inferior cerebellar peduncle. Synonym: fibrae arcuatae externae. (05 Mar 2000) |
| fibrae arcuatae internae | <anatomy> Fibres that arise in the cuneate and gracile nuclei, pass in a curving course across the midline of the medulla oblongata, and form the contralateral medial lemniscus. It also designates other fibres such as those of the olivocerebellar tract that arch through the substance of the medulla and form sensory decussation. Synonym: fibrae arcuatae internae. (05 Mar 2000) |
| fibrae circulares | The circular fibres of the ciliary muscle. Synonym: fibrae circulares, Muller's fibres, Muller's muscle, Rouget's muscle. (05 Mar 2000) |
| fibrae corticonucleares | <physiology> Descriptive term connotating fibres from a cortical structure (cerebral or cerebellar) passing to subcortical cell groups; fibres comprising the tractus corticobulbaris; cerebellar corticonuclear fibres (Purkinje cell axons to the cerebellar nuclei). Synonym: fibrae corticonucleares. (05 Mar 2000) |
| fibrae corticopontinae | <physiology> The fibres that compose the corticopontine tract. Synonym: fibrae corticopontinae. (05 Mar 2000) |
| fibrae corticoreticulares | <physiology> Corticofugal fibres distributed to the reticular formation of the mesencephalon and rhombencephalon. See: corticobulbar fibres. Synonym: fibrae corticoreticulares. (05 Mar 2000) |
| fibrae corticospinales | The fibres that compose the pyramidal tract (corticospinalis). Synonym: fibrae corticospinales, corticospinal fibres, fibrae pyramidales. (05 Mar 2000) |
| fibrae dentatorubrales | Nerve fibres arising in the dentate nucleus of the cerebellum and projecting, via the superior cerebellar peduncle and its decussation, to the contralateral red nucleus of the midbrain. Synonym: fibrae dentatorubrales. (05 Mar 2000) |
| fibrae intercrurales | Horizontal arched fibres that pass from the inguinal ligament across the medial and lateral crura of the superficial inguinal ring. Synonym: fibrae intercrurales, intercolumnar fasciae, intercolumnar fibres. (05 Mar 2000) |
| fibrae lentis | <biology, ophthalmology, physiology> The elongated cells of ectodermal origin forming the substance of the crystalline lens of the eye. Synonym: fibrae lentis. (05 Mar 2000) |
| fibrae meridionales | The longitudinal fibres of the ciliary muscle. Synonym: fibrae meridionales. (05 Mar 2000) |
| fibrae obliquae gastrici | The smooth muscle fibres of the innermost layer of the muscular coat of the stomach; the fibres occur chiefly at the cardiac end of the stomach and spread over the anterior and posterior surfaces. Synonym: fibrae obliquae gastrici. (05 Mar 2000) |