. Cunningham's Text-book of anatomy. Anatomy. 6S4 THE NERVOUS SYSTEM. brain, dorsal to the efferent portion of the facial nerve, opposite to the auditory vesicle, and in close association with it. Becoming separated from the brain, the cellular mass separates into three portions, of which the intermediate part is associated with the facial nerve and intermediate nerve (as the genicular ganglion), while the medial and lateral parts are converted into the medial (vestibular) andf lateral (cochlear) ganglia and the roots of the acoustic nerve. The cells becoming bipolar, their central processes a
. Cunningham's Text-book of anatomy. Anatomy. 6S4 THE NERVOUS SYSTEM. brain, dorsal to the efferent portion of the facial nerve, opposite to the auditory vesicle, and in close association with it. Becoming separated from the brain, the cellular mass separates into three portions, of which the intermediate part is associated with the facial nerve and intermediate nerve (as the genicular ganglion), while the medial and lateral parts are converted into the medial (vestibular) andf lateral (cochlear) ganglia and the roots of the acoustic nerve. The cells becoming bipolar, their central processes are secondarily connected with the brain on the dorsal (lateral) aspect of the facial nerve; the peripheral processes proceed to the auditory vesicle, to which they are distributed as the vestibular and cochlear nerves. Numerous cells are carried along with the nerve trunks into relation with the auditory capside, and constitute the vestibular and cochlear ganglia. IX. and X. The glossopharyngeal and vagus nerves are developed from the side of the hind-brain, both in the same way, and each by two roots. A collection of cells separates itself from the alar lamina of the hind-brain behind the auditory vesicle to form the ganglionic afferent root. The ganglion of the vagus is much larger than that of the glossopharyngeal. Each ganglion becomes divided into two parts, a proximal and a distal portion, connected together by a commissural band of fibres. The proximal ganglion (superior ganglion of the glossopharyngeal; jugular ganglion of the vagus) is secondarily connected by centripetal fibres to the hind-brain. From the distal ganglion (petrous. LATERAL AREA MEDIAL AREA f ANTERIOR ROOT POSTERIOR ROOT " DC X 'ff/////^^- / / '""J A B Fig. 604.—Comparison of Origins of Nerve Roots from Spinal Medulla and Hind-Brain (after His). A. Spinal medulla ; B. Hind-brain. ganglion of the glossopharyngeal; ganglion nodosum of the vagus) peripheral fibres grow out
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
