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METENCEPHALON. Part of the rhomben-cephalon consisting of the pons, cerebellum and tegmentum.

PONS. Located between the interpeduncular fossa and pyramids. It consists mostly of crossing fibers and cells of the cerebral, pontine and cerebellar tracts. A B

Bulbopontine (pontobulbar) sulcus. Sulcus bulbopontines. Limiting furrow between the inferior margins of the medulla oblongata and pons. Site of exit of cranial nerves VI, VII and VIII. A

Basilar sulcus of pons. Sulcus basilaris. Median groove produced by the pyramidal tract fibers situated to the right and left of the midline. It is occupied by the basilar artery. A C Middle (pontine) cerebellar peduncle. Pedun-culus cerebellaris medius (pontinus). Thick middle peduncle containing the pontocerebel-lar tract. A

Pontocerebellar trigone. Trigonum pontocere-bellare. Clinically important angle between the pons, medulla oblongata and cerebellum. A SECTIONS OF PONS. Senctiones pontis. Anterior (balisar) part of pons. Pars anterior (balisaris) pontis. Portion of pons consisting mainly of fibers of the cerebropontocerebellar tract. C

Longitudinal pontine fibers. Fibrae pontis longitudinales. Longitudinally coursing tracts of fibers described below. Corticospinal fibers. Fibrae corticospinales. Part ofthe pyramidal tract passing into the spinal cord. C

Corticonuclear (corticobulbar) fibers. Fibrae corticonucleares. Fibers of the pyramidal tract passing to the motor nuclei of cranial nerves. C Corticoreticular fibers. Fibrae corticoreticu-lares. Fibers passing from the cerebral cortex to the reticular formation. Corticopontine fibers. Fibrae corticopontinae. Fibers extending to the pontine nuclei from the frontal, occipital and temporal lobes. C Transverse pontine fibers. Fibrae pontis trans-versae. Transversely coursing fibers of the cere-bropontocerebellar tract. C Pontocerebellar fibers. Fibrae pontocerebel-lares. Fibers of the pontocerebellar tract passing from the pons to the cerebellum. C Pontine nuclei. Nuclei pontis. Intercalary cells of the cerebropontocerebellar tract situated in the ventral part of the pons. C

Posterior part of pons (tegmentum of pons).

Pars posterior pontis (tegmentum pontis). Part of pons situated between the 4th ventricle and the transverse pontine fibers. C Pontine raphe. Raphe pontis. Fibers from the trigeminal nucleus forming the midline of the pons. C

19 Medial longitudinal fasciculus. Fasciculus longitudinalis medialis. Tract that connects the nuclei of the ocular and neck muscles on one side and the vestibular organ on the other. C

20 Posterior longitudinal fasciculus. Fasciculus longitudinalis posterior [[Schutz]]. Reciprocal connections between the hypothalamus and the nuclei of cranial nerves III, V, VII, X; XII, the nucleus ambiguus, and the tractus solitarius and salivatorius in the mesencephalic central gray region. C

21 Medial lemniscus. Lemniscus medialis. De-cusssating connection between the nuclei of the posterior funiculus and the thalamus located mainly medially but also laterally. C Tectospinal (spinotectal) tract. Tractus tec-tospinalis. It begins in the superior colliculus, crosses the opposite side and then lies ventral to the medial longitudinal fasciculus. It is concerned with optic reflexes. C Reticular formation. Formatio reticularis. Located in the posterior part of the pons; this long group of cells is permeated by nerve fibers and continues anterosuperiorly and caudally. It is concerned with the integration of visceral and muscular functions. C

Spinal lemniscus. Lemniscus spinalis. Cranial continuation of the lateral and anterior spinothalamic tracts. C

Spinal tract of trigeminal nerve. Tractus spinalis nervi trigeminalis. Trigeminal fibers descending as far as C4 to join the nucleus of the spinal tract of the trigeminal nerve. B

Spinal (inferior) nucleus of trigeminal nerve. Nucleus spinalis (inferior) nervi trigeminalis. Nucleus belonging to the spinal tract of the trigeminal nerve. B

Pontine nucleus of trigeminal nerve. Nucleus pontinus nervi trigeminalis. Main nucleus of trigeminal serving primarily for the sense of touch. B

Trigeminal lemniscus (trigeminothalamic tract). Lemniscus trigeminalis (tractus trige-minothalamicus). Crossed fibers ofthe trigemi-nal nucleus extending to the thalamus. C Mesencephalic tract of trigeminal nerve. Trac-tus mesencephalicus nervi trigeminalis (trac-tus mesencephalicus trigeminalis). Trigeminal fibers for the nucleus of the trigeminal nerve tract located lateral to the cerebral aqueduct and in the lateral part of the arch to the 4th ventricle. B C

Mesencephalic nucleus of trigeminal nerve.

Nucleus mesencephalicus nervi trigeminalis [nucleus mesencephalicus trigeminalis]. Upper sensory nucleus extending to the area below the tectal lamina. B

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