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Serial transverse sections of the brain stem

Pons.

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Image #30-4
Bassett ImageDiagram Image
Legend Image
Serial transverse sections of the brain stem
Pons.
This section is 4 mm. above the last one. Fibers of the trigeminal nerve (4) pass obliquely medially through the brachium pontis. On the right side the motor nucleus (13) of this nerve is visible. The spinal tract of the trigeminal nerve, which begins its descending course through the brain stem at this level, is not clearly seen here. The trapezoid body (5) is prominent. The superior olive (15) is still present and the lateral lemniscus (14) is larger at this level than in the previous section.
1 . Vermis
2 . Fourth ventricle
3 . Brachium pontis (middle cerebellar peduncle)
4 . Trigeminal nerve (V) (fibers within pons)
5 . Trapezoid body and medial lemniscus
6 . Deep pontine fibers
7 . Longitudinal fasciculus
8 . Superficial pontine fibers
9 . Optic chiasm
10 . Commissural fibers of cerebellum
11 . Brachium conjunctivum (superior cerebellar peduncle)
12 . Restiform body (inferior cerebellar peduncle)
13 . Motor nucleus of trigeminal nerve
14 . Lateral lemniscus
15 . Superior olivary nucleus
16 . Central tegmental tract
17 . Trigeminal nerve (V)
18 . Pons
19 . Oculomotor nerve (III)
20 . Olfactory trigone