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Fourth ventricle with the medulla oblongata and the corpora quadrigemina. The roman numbers indicate superficial origins of the cranial nerves, while the other numbers indicate their deep origins, or the position of their central nuclei. 8, 8', 8", auditory nuclei nerves; t, funiculus teres; A, B, corpora quadrigemina; c.g, corpus geniculatum; p, c, pedunculus cerebri; m, c, p, middle cerebellar peduncle; s, c, p, superior cerebellar peduncle; i, c, p, inferior cerebellar peduncle; l, c, locus caeruleus; e, t, eminentia teres; a, c, ala cinerea; a, n, accessory nucleus; o, obex; c, clava; f, c, funiculus cuneatus; f, g, funiculus gracilis.

Fourth Ventricle with the Medulla Oblongata and the Corpora Quadrigemina

Fourth ventricle with the medulla oblongata and the corpora quadrigemina. The roman numbers indicate…

Diagram of a longitudinal section through the pons, showing the relation of the nuclei for the ocular muscles. CQ, corpora quadrigemina; 3, third nerve; II I, its nucleus; 4, forth nerve; IV, its nucleus, the posterior part of the third; 6, sixth nerve. The probable position of the center and nerve fibers for accommodation is show at a and a' for the reflex action of iris, at b, and b'; for the external rectus muscles, at c, c'. The lines beneath the floor of the forth ventricle indicate fibers, which connect the nuclei.

Pons

Diagram of a longitudinal section through the pons, showing the relation of the nuclei for the ocular…