. Cunningham's Text-book of anatomy. Anatomy. DEVELOPMENT OF LABYKINTH. 853 which go through the foramina in the recessus cochlearis and are distributed to the hair cells of the vestibular part of the ductus cochlearis. On this vestibular branch, close to its origin from the cochlear nerve, is a minute ganglion (Bcettcher). N. Vestibuli.—The vestibular nerve is distributed to the utricle, the saccule, and the ampullse of the semicircular ducts. It divides into three branches, superior, inferior, and posterior, and each of these splits into filaments which pass through foramina in the fundus of
. Cunningham's Text-book of anatomy. Anatomy. DEVELOPMENT OF LABYKINTH. 853 which go through the foramina in the recessus cochlearis and are distributed to the hair cells of the vestibular part of the ductus cochlearis. On this vestibular branch, close to its origin from the cochlear nerve, is a minute ganglion (Bcettcher). N. Vestibuli.—The vestibular nerve is distributed to the utricle, the saccule, and the ampullse of the semicircular ducts. It divides into three branches, superior, inferior, and posterior, and each of these splits into filaments which pass through foramina in the fundus of the internal acoustic meatus. The filaments from the superior branch go through the foramina in the area vestibularis superior and supply the macula of the utricle and the cristse ampullares of the superior and lateral semicircular ducts; those from the inferior branch run through the fora- mina in the area vestibularis inferior to the macula of the saccule. _ The posterior branch passes through the foramen singulare, and its filaments, six to eight in number, are distributed to the crista ampullaris of the posterior semicircular duct. Ganglion Vestibulare.—On the trunk of the vestibular nerve, within the internal acoustic meatus, is a ganglion, the vestibular ganglion, of bipolar nerve cells ; the fibres of the nerve arise from the cells of this ganglion. Sometimes the vestibular nerve divides on the proximal side of the ganglion and the latter is then split into three parts, one on each of the three branches of the nerve. Vessels of the Internal Ear.—The internal auditory artery, a branch of the basilar, enters the internal acoustic meatus and divides into vestibular and cochlear branches. The vestibular branch supplies the soft tissues in the vestibule and semicircular canals, each canal receiving two arteries, which, starting from opposite extremities of the canal, anastomose on the summit of the arch. The cochlear branch divides into numerous twigs, which enter the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
