. Cunningham's Text-book of anatomy. Anatomy. INTERNAL STEUCTUEE OF THE PONS. 565 The lateral area lies between the root fibres of the hypoglossal and those of the vagus. It contains : (a) the inferior olivary nucleus ; (b) the dorsal accessory olivary nucleus ; (c) the nucleus lateralis; (d) the nucleus ambiguus; (e) the splanchnic efferent nucleus of the vagus and glosso- pharyngeal nerves ; (/) the formatio reticularis grisea. The posterior area is situated behind the vagus roots, and within its limits are seen : (1) the restiform body ; (2) the superior part of the cuneate nucleus ; (3) to
. Cunningham's Text-book of anatomy. Anatomy. INTERNAL STEUCTUEE OF THE PONS. 565 The lateral area lies between the root fibres of the hypoglossal and those of the vagus. It contains : (a) the inferior olivary nucleus ; (b) the dorsal accessory olivary nucleus ; (c) the nucleus lateralis; (d) the nucleus ambiguus; (e) the splanchnic efferent nucleus of the vagus and glosso- pharyngeal nerves ; (/) the formatio reticularis grisea. The posterior area is situated behind the vagus roots, and within its limits are seen : (1) the restiform body ; (2) the superior part of the cuneate nucleus ; (3) to the medial side of this a crowd of transversely cut bundles of fibres, loosely arranged and forming the descending root of the vestibular part of the acoustic nerve; (4) close to these, but placed more deeply, a round, compact, and very conspicuous bundle of transversely cut fibres, viz., the tractus solitarius, or descending root of the vagus and glossopharyngeal nerves; (5) the large tractus spinalis of the trigeminal nerve close to the lateral side of its nucleus composed of substantia gelatinosa. INTERNAL STRUCTURE OF THE PONS. When transverse sections are made through the pons, it is seen to be composed of a basilar part and a dorsal or tegmental part. The latter may be regarded as Tractus spinalis of trigeminal nerve Its nucleu Facial nerve Facial nucleus Superior olive Fasciculus thalamo-olivaris Restiform body Nucleus of tractus spinalis of trigeminal nerve ..Vestibular nerve Tractus spinalis of trigeminal nerve. Brachium pontis Deep transverse fibres of pons Pyramidal bundles Superficial transverse fibres of pons Fig. 498.—Section through the Lower Part of the Human Pons immediately above the Medulla Oblongata. the upward prolongation of the medulla oblongata, exclusive of the pyramids which are drawn forward into the basilar part. Pars Basilaris Pontis.—This constitutes the chief bulk of the pons. It is composed of: (1) transverse fibres arranged in coarse bundle
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
