. The brain from ape to man; a contribution to the study of the evolution and development of the human brain. Brain; Evolution; Pongidae. 222 THE LOWER PRIMATES LEVEL OF THE EMERGENCE OF THE SIXTH NERVE (FIG. 123) A remarkable feature at this level of the brain stem in mycetes is the appearance in its entire course of the emergent root of the abducens FIG. 123. MYCETES SENICULUS. LEVEL OF EMERGENCE OF SIXTH NERVE. CEN, Central Gray Matter; cow, Ventral Spinocerebellar Tract; mf, Mesial Fillet; nab, Abducens Nucleus; NBE, Nucleus of Bechterew; nr. Nucleus of Rolando; n6, Abducens Nerve;
. The brain from ape to man; a contribution to the study of the evolution and development of the human brain. Brain; Evolution; Pongidae. 222 THE LOWER PRIMATES LEVEL OF THE EMERGENCE OF THE SIXTH NERVE (FIG. 123) A remarkable feature at this level of the brain stem in mycetes is the appearance in its entire course of the emergent root of the abducens FIG. 123. MYCETES SENICULUS. LEVEL OF EMERGENCE OF SIXTH NERVE. CEN, Central Gray Matter; cow, Ventral Spinocerebellar Tract; mf, Mesial Fillet; nab, Abducens Nucleus; NBE, Nucleus of Bechterew; nr. Nucleus of Rolando; n6, Abducens Nerve; N7, Facial Nerve; n8, Auditory Nerve; pd, Predorsal Bundle; pl. Posterior Longitudinal Fasciculus; pv, Pyramid; ref, Reticular Formation; scp, Superior Cerebellar Peduncle; so, Superior Olive; trd, Descending Trigeminal Tract; trp, Trapezoid Body; TUR, Tractus Uncinatus of Russel (Hook Bundle). [Accession No. 148. Section 230. Actual Size 18X7 mm.) The origin of this nerve is seen in its nucleus (Nab), and its course directly ventrad through the trapezoid body (Trp ), the lateral portion of the mesial fillet (Mf), and its emergence lateral to the pyramid (Py), are exceptional in cross sections of the primate stem. No fibers of the pons are as yet appar- ent at this stage. The central gray matter (Ccn ) is a narrow zone, which in its mesial angle contains the second portion of the facial nerve (N7). Its lateral angle is continuous with the nucleus of Bechterew (NBe).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tilney, Frederick, 1875-1938; Riley, Henry Alsop, 1887-. New York, P. B. Hoeber, inc.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbrain, booksubjectevo
