Anatomy, physiology and hygiene . or nerves of smell; 2d, optic nerves, ornerves of sight; 3d, motor nerves to three of the muscles that move theeyeballs, and to the iris and ciliary muscle of the eye ; 4th, pathetic nerves,each of which moves one muscle of the eyeball, pulling the eyeball up-ward and outward ; 6th, motor nerve to one of the straight muscles of theeyeball; 8th, auditory nerves, or nerves of hearing; 9th, glossopharyn-geal nerves, nerves of sensation to pharynx, fauces, and tonsil, and specialnerve of taste to certain parts of the tongue; the 11th joins the 10th,and is also dis
Anatomy, physiology and hygiene . or nerves of smell; 2d, optic nerves, ornerves of sight; 3d, motor nerves to three of the muscles that move theeyeballs, and to the iris and ciliary muscle of the eye ; 4th, pathetic nerves,each of which moves one muscle of the eyeball, pulling the eyeball up-ward and outward ; 6th, motor nerve to one of the straight muscles of theeyeball; 8th, auditory nerves, or nerves of hearing; 9th, glossopharyn-geal nerves, nerves of sensation to pharynx, fauces, and tonsil, and specialnerve of taste to certain parts of the tongue; the 11th joins the 10th,and is also distributed to muscles about the neck; 12th, hypo-glossalnerves, mainly to muscles of tongue. 2 The cavity in which the eye rests. 3 This point is very sensitive to pressure. Where the other branchesof the nerve emerge, sensitiveness is less. THE NERVOUS SYSTEM. 289 opening just below the front lower edge of the orbitalcavity, it is distributed to the middle portion of the face,the nose, cheeks, and upper lip. The third branch, with. Fig. Branches of the Seventh and the Fi Fairs of Cranial Nerves, which the motor-nerve filaments are associated, suppliessensitive fibres to the mucous membrane of the cheeks,lips, and front part of the tongue, and to the lower emerges at an opening in the front part o( the lower jaw. 290 THE NERVOUS SYSTEM. to be distributed to the lower lip, chin, and adjacent parts(Fig. 93). Irritation of this nerve by disease or other cause produces intense pain, asin neuralgia, headache, or tooth-ache. 314. The Facial or Seventh Pairof Nerves are the great motornerves of the face, the nervesof expression, by which the fea-tures are animated by variousmovements, in response to theemotions. One nerve of the pairemerges from the skull near theexternal opening of each ear, andis distributed to the muscles ofthe face. When these nervesare irritated or diseased, convul-sive twitchings of the face andunusual exj)ressions result. Ifthe injury is c
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