Electro-physiology and electro-therapeutics : showing the best methods for the medical uses of electricity / By Alfred C. Garratt.

lary region. They are the masseteric, the temporal, the buccal, and the internal pterygoid. Then, again, the internal branch of the inferior maxillary divides into three branches, which are the gustatory, the inferior dental, and the anterior auricular. The gustatory supplies the side of the tongue, its papillae, and the mucous membrane. The inferior dental passes on by the ramus of the lower jaw, enters the dental foramen, and runs along the bony canal in the jaw, giving off branches to the teeth and gums as it passes, and then terminates in two considerable twigs, the incisive and the mental. The former supplies the lower incisive teeth, while the mental branch escapes through the mental fora- men, and there becomes superficial, to supply the muscles and skin of the chin, lower lip, and the mucous membrane of the lower lip ; it also communicates with the portio dura. Now, if we go back and trace the temporal, or the second of the four branches of the inferior maxillary, we find it at first turns around the posterior side of the neck of the lower jaw condyle, near the joint of the jaw, then goes up vertically between the articulation of the jaw and the anterior edge of the ear, where it becomes superficial, and then even sub-cutaneous, in the most superior portions of the temporal fossa. But at its root, and behind the condyle, it furnishes important anastomotic branches to the portio dura; thus uniting with the upper divis- ions of these motory nerves, to be together distributed and lost in the integuments of the temple, the surroundings of the eye, and in the upper lip. These deserve our particular attention, as likewise do the twigs of this nerve to the lobe of the ear, and those to the auditory cavity and pavilion, as also the communi- cations with twigs from the cervical plexus, and from the lachry- mal, sub-cutaneous malar, auricular, and facial nerves. Neuralgic Points. —The, to us, most important points of the tri-facial nerve are, 1. The point of exit of the lachrymal branch, which is at the external part of the upper eyelid. This is what Dr. Valleix called the " palpebral painful point." 2. The point of emergence of the frontal nerve, or, rather, of its external branch, from the upper orbital foramen, called the upper orbital point. 37*