Carpenter's principles of human physiology . jection on the floor of the fourth ventricle and pass upwards tothe corpora quadrigemina; the lateral pair (lemniscus) is the continuation of theposterior and lateral columns of the medulla oblongata lying between the olivarybody and restiform column.* They ascend on each side to the nates. The trans-verse fibres of the pons constitute the great commissure of the Cerebellum; andare an extension of the arciform fibres of the medulla oblongata; it will beobserved that these fibres not only surround the longitudinal bands which* German, Halse
Carpenter's principles of human physiology . jection on the floor of the fourth ventricle and pass upwards tothe corpora quadrigemina; the lateral pair (lemniscus) is the continuation of theposterior and lateral columns of the medulla oblongata lying between the olivarybody and restiform column.* They ascend on each side to the nates. The trans-verse fibres of the pons constitute the great commissure of the Cerebellum; andare an extension of the arciform fibres of the medulla oblongata; it will beobserved that these fibres not only surround the longitudinal bands which* German, Halsenstranges. STRUCTURE OF THE MEDULLA OBLONGATA. 5S3 connect the Cerebral mass with the Spinal Cord, but pass through them so as iasome degree to isolate the two lateral halves from one another, and to form acomplete septum between the anterior and posterior portions of each. Theseanterior and posterior tracts of the Crura Cerebri are probably essentiallysubservient to the motor and sensory functions. The cells of the grey substance Fig. Course of the Motor tract, according to Sir C. Bell;—A, A, fibres of the Hemisphere, converging toform the anterior portion of the cms cerebri; Li, the same tract, where it passes the crus cerebri; C,the right Pyramidal body, a little above the point of decussation ; d, the remaining part of the PonsVarolii, a portion having been dissected off to expose if.—1, olfactory nerve, in outline: 2, union ofoptic nerves; 3, 3, motor oculi; 4,4, patheticus ; 5,5, trigeminus; 6, 6, its muscular division ; 7,7, itssensory root; 8, origin of sensory root from the posterior part of the medulla oblongata; 9, abducensoculi; 10, auditory nerve; 11, facial nerve; 12, eighth pair; 13, hypoglossal; 14, spinal nerves; 15,spinal accessory of right side, separated from par vaguin and glosso-pharyngeal. of the pons are generally round, oval, or fusiform, and of about the 1500thof an inch in diameter, and are so connected with nerve fibres in chains orbundles
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphysiology, bookyear1
