This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...that a portion of the neuraxons is distributed entirely within the medullary wall, while another portion passes out to form ventral roots, one of which', N. 12, forming part of the hypoglossal t Fig. 116.--Pig, 12.0 Mm. Transverse Series 5, Section 249. Car.in, Internal carotid artery. cl.I, First or auditory gill ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...that a portion of the neuraxons is distributed entirely within the medullary wall, while another portion passes out to form ventral roots, one of which', N. 12, forming part of the hypoglossal t Fig. 116.--Pig, 12.0 Mm. Transverse Series 5, Section 249. Car.in, Internal carotid artery. cl.I, First or auditory gill cleft. D. Z, Dorsal zone of spinal cord. Ec, Ectoderm. H, Anlage of cerebral hemisphere. Jug, Jugular vein. Jug.in. Internal jugular vein. L, Lens. L.R.u, Lateral root of the eleventh nerve. L. V, Lateral ventricle. Mx.in, Inferior maxillary nerve. N.y, Facial nerve. N.q.petr, Petrosal ganglion of the ninth nerve. N.io.ii, United vagus and spinal accessory nerve. N.12, Hypoglossal nerve. Op, Stalk of the optic evagination. Ph, Pharynx. Ret, Retina. V. Z, Ventral zone of spinal cord. X 22 diams. nerve, is shown in the figure. A third portion of the neuraxons, at least in the upper cervical region, as also in the medulla oblongata, passes out to form the lateral roots. The positions of the exits of these two bundles of nerve-fibers are constant and characteristic. The ventral root always passes out from the middle of the ventral zone about half-way between the median floor-plate and the dorsal limit of the zone. The lateral root always passes out at the upper dorsal limit of the ventral zone and immediately below the point of entrance of the true dorsal root. Formerly the lateral roots were not distinguished from the dorsal roots. Following downward in the figure we come to the section of the jugular vein, Jug, just inside of which lies the common trunk, N. 10. It, of the united tenth and eleventh or vagus and accessorius nerves, and also, nearby, the lower part of the petrosal ganglion, N. p. petr, of the glosso-pharyngeal nerve. Lower down and nea...
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