The anatomy of the nervous system, from the standpoint of development and function . lature. Neuron I, or upper motor neuron. The corticobulbar fibers arise from the I I 11 Rl NT PATHS AND REFLEX ARCS 321 giant pyramidal cells of the part of the motor cortex near the lateral fibers run through the genu of the internal capsule and the basis pedunculi to end, directly or indirectly, in synaptic relation to the primary motor neuronsof the somatic motor and special visceral motor nuclei of the brain stem. Before terminating, the majority cross the median plane, but some end in the mo
The anatomy of the nervous system, from the standpoint of development and function . lature. Neuron I, or upper motor neuron. The corticobulbar fibers arise from the I I 11 Rl NT PATHS AND REFLEX ARCS 321 giant pyramidal cells of the part of the motor cortex near the lateral fibers run through the genu of the internal capsule and the basis pedunculi to end, directly or indirectly, in synaptic relation to the primary motor neuronsof the somatic motor and special visceral motor nuclei of the brain stem. Before terminating, the majority cross the median plane, but some end in the motornuclei of the same side (Fig. 239). Neuron II, lower or primary motor neuron. From the large multipolarcells of the somatic motor and special visceral motor nuclei arise fibers, whii hrun through the cranial nerves to end in striated musculature. Tr. corticobulb. F. A. Sth. (Ill) F. A. Pd. Tr. cb. lot.(Ill, VI,XI) Jr. cb. med. /•. A. P. (V, X, XI, XII) Pons P. (VII) Tr. corticosp. Tr. corticobulb. XI, C 11-IV C II-IV Tr. corticosp. mcd. C II-IVXI, CII-IV. Pulvinar Med. Ii mniscusNuc. A . /// Corpora quad. Nuc. N. V Fourth N. VI Nuc. N. VII Nuc. ambiguus Nn. IX and X Nuc. N. XII Xuc. gracilisNuc. cuncatusXuc. XI XI, XII, C II-IVTr. corticosp. lat. Fig. 240.—The course of the fibers of the corticobulbar tract. Redrawn from tract, solid black; corticospinal tract, vertical lines; the medial lemniscus, horizontallines. F. A. B. P., Bulbopontine aberrant fibers; 7. A. P., aberrant fibers of the pons; F. A. Pd.,aberrant fibers of the peduncle; F. A. Sth., subthalamic aberrant fibers; Tr. cb. lat., tractus cortico-bulbaris lateralis; Tr. cb med., tractus corticobulbaris medialis. The Roman numerals indicatethe nuclei of the cranial and cervical nerves which are supplied by the various bundles. The Corticobulbar Tract.—According to Dejerine (1914). who, because of the carefulstudy which he and his associates have m
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