The anatomy of the nervous system, from the standpoint of development and function . rs which are continuous with the longitudinal fasciculi of thepons. The Tegmentum.—The dorsal portion of the pons is directly continuouswith the tegmentum of the mesencephalon. Both are composed of reticularformation, consisting of interlacing longitudinal and transverse fibers groupedin fine bundles and separated by minute masses of gray substance, in which areembedded important nuclei and fiber tracts. In the caudal part of the mid-brain and the rostral part of the pons are four cellular masses the locations
The anatomy of the nervous system, from the standpoint of development and function . rs which are continuous with the longitudinal fasciculi of thepons. The Tegmentum.—The dorsal portion of the pons is directly continuouswith the tegmentum of the mesencephalon. Both are composed of reticularformation, consisting of interlacing longitudinal and transverse fibers groupedin fine bundles and separated by minute masses of gray substance, in which areembedded important nuclei and fiber tracts. In the caudal part of the mid-brain and the rostral part of the pons are four cellular masses the locations ofwhich are indicated in Fig. 112. They are the dorsal nucleus of the raphe, thesuperior central nucleus, the ventral tegmental nucleus, and the dorsal tegmentalnucleus. The latter is a collection of small cells in the central gray substance, sep-arated from the ventral tegmental nucleus by the medial longitudinal the ventral and dorsal tegmental nuclei receive fibers from the mammillarybody (tractus mamillotegmentalis), and within the dorsal one there also ter-158. 1111. [NTERNAL STRUCTURE 01 nil. MESENCEPHALON minute fibers from the interpeduncular ganglion (Fig. 211). The tegmentumcontains many longitudinal fiber tracts which are continued into it from the dor-sal part of the pons. The most conspicuous of these is the brackium conjunc-tivum. The Decussation of the Brachia Conjunctiva.—In the sections of the psaw that, as the brachia conjunctiva ascend toward the mesencephalon, theysink deeper and deeper into the pars dorsalis pontis I Fig. 112). When theyreach the level of the inferior colliculi of the corpora quadrigemina they are Aqueduct of eerebru Mesencephalic root of X Medial longitudinalfasciculusDecussati >>i ofbrachiconjunctiv Interpeduncular fosSubstantia, nigra
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectnervoussystem, bookye
