. Anatomy, descriptive and applied. Anatomy. THE FIFTH, TRIGEMINAL, OR TRIFACIAL NERVE 991 supraorbital foramen; that of the second through the infraorbital foramen; and the third throujjh the mental foramen. The supraorbital foramen is situated at the junction of the internal and middle third of the supraorbital arch. If a straight line is drawn from this point to the lower border of the mandibfe, so that it passes between the two bicuspid teeth of the mandible, it will pass over the infraorbital and mental foramina, the former being situated about one centimetre (two-fifths of an inch) below
. Anatomy, descriptive and applied. Anatomy. THE FIFTH, TRIGEMINAL, OR TRIFACIAL NERVE 991 supraorbital foramen; that of the second through the infraorbital foramen; and the third throujjh the mental foramen. The supraorbital foramen is situated at the junction of the internal and middle third of the supraorbital arch. If a straight line is drawn from this point to the lower border of the mandibfe, so that it passes between the two bicuspid teeth of the mandible, it will pass over the infraorbital and mental foramina, the former being situated about one centimetre (two-fifths of an inch) below the margin of the orbit, and the latter varying in jjosition according to the age of the individual. In the adult it is midway between the upper and lower borders of the mandible; in the child it is nearer the lower border; and in the edentulous jaw of old age it is close to the upper margin. Applied Anatomy.—In fracture of the hose of the skull the trigeminal nerve or one of its brandies may be injured. It seems certain that occasionally, though seldom, the trigeminal nerve may be actually divided by such an injury. The trigeminal nerve may be aft'ected in its entirety, or its sensor or motor root may be affected, or one of its primary main divisions. In injury to the sensor root there is anesthesia of the half of the face on the side of the lesion, with the exception of the skin over the parotid gland; insensibility of the conjunctiva, followed, if the eye is not temporarily protected with a watch glass, by destructive inflammation of the cornea,. MENTAL NtRVE- FlG. 742.—Sensor areas of the head, showing the general distribution of the three dii nerve. Gerrish'3 Anatomy. (Modified from Testut.) partly, it is held, from loss of trophic influence, and partly it is certain, from the irritation pro- duced by the presence of foreign bodies on it, which are not perceived by the patient, and there- fore not by the act of winking; dryness of the nose, loss to a conside
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
