. Anatomy, descriptive and applied. Anatomy. THE SEVENTH OR FACIAL NERVE 999 the Platysma and Depressor anguli oris, supplying the muscles of the lower lip and chin, and communicating with the mental branch of the inferior dental nerve. The cervical branch (ramtis colli) runs forward beneath the Platysma, and forms a series of arches across the side of the neck over the suprahyoid region. A branch descends vertically to join with the superficial cervical nerve from the cervical plexus; others supply the Fig. 746.—^The nerves of the scalp, face, and side of thi Applied Anatomy.—The f
. Anatomy, descriptive and applied. Anatomy. THE SEVENTH OR FACIAL NERVE 999 the Platysma and Depressor anguli oris, supplying the muscles of the lower lip and chin, and communicating with the mental branch of the inferior dental nerve. The cervical branch (ramtis colli) runs forward beneath the Platysma, and forms a series of arches across the side of the neck over the suprahyoid region. A branch descends vertically to join with the superficial cervical nerve from the cervical plexus; others supply the Fig. 746.—^The nerves of the scalp, face, and side of thi Applied Anatomy.—The facial nerve is more frequently paralyzed than any of the other of the cranial nerves. The paralysis [facial 'palsy) may depend either upon (1) central causes —i. e., blood clots or intracranial tumors pressing on the nerve before its entrance into the internal auditory meatus. It is also one of the nerves involved in bulbar -paralysis. Or (2) it may be paralyzed in its passage through the petrous bone by damage due to middle-ear disease or by fractures of the base of the skull. Or (3) it may be afl'ected at or after its exit from the stylomastoid foramen. This is commonly known as Bell's paralysis. It may be due to exposure to cold or to injury of the nerve, either from accidental wounds of the face or during some surgical operation, as removal of parotid tumors, opening of abscesses, or operations on the mandible. When the cause is central, the abducent nerve is usually paralyzed as well, and there is also hemiplegia on the opposite side. In these cases the electric reactions are the same as in health; whereas, when the paralysis is due to a lesion in the course of the nerve, the reactions of degenera- tion develop. When the nerve is paralyzed in the petrous bone, in addition to the paralysis of the muscles of expression, there is loss of taste in the anterior part of the tongue, and the patient is. Please note that these images are extracted from scanned page images tha
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
