Electro-physiology and electro-therapeutics : showing the best methods for the medical uses of electricity / By Alfred C. Garratt.
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it leaves the parent trunk, pierces the supinator brevis muscle, and emerges from its lower border rather on the posterior of the forearm, where it divides into two branches, which supply the whole of the muscle on the posterior aspect of the forearm. The longest branch of this, called the ramus profundus dorsalis nerve, descends to a little below the posterior aspect of the wrist, where it forms a large gangliform swelling, (as often observed in nerves that supply joints,) and from which numer- ous branches are distributed to the wrist joint. The circumflex or axillary nerve, arising from the brachial plexus, also passes downwards, but over the border of the sub- scapularis muscle, then winds around the neck of the humerus, and divides into numerous branches, which supply the muscle deUoideus. The branches of the circumflex nerve are both mus- cular and cutaneous. The muscular branches go to the sub- scapularis, teres major, latissimus dorsi, and the deltoid mus- cles. The cutaneous branches pierce the deltoid muscle after traversing its fleshy fibres, and are lost in the integument of the shoulder. One of these, which is the largest, (cutaneus brachii superior,') winds around the very posterior border of the deltoid, and divides into many filaments, which pass in a radiating direc- tion across the back of the shoulder, and are lost in the skin of those parts, and particularly over the upper region of the deltoid. The neuralgic points then, most to be noticed arc, first, the terminal cutaneous nerve region of the posterior branches along the lower cervical and spine muscles. Second, a neuralgic spot over the spine of the shoulder blade, where the supra-scapular nerve branch passes in front of the concave margin of the scap- ula, to enter the infra-spinous fossa. Third, a neuralgic spot close under the outer end of the clavicle, where lies the lower end of the great brachial plexus. Another spot in the upper anterior axilla. Another on the inner anterior neck of the humerus, where the several large nerve trunks for the arm first leave the great plexus, and here become superficial, which makes them at once liable to neuralgia, but also accessible to the elec- trodes. Fourth, a neuralgic spot on the pectoralis major muscle, where the loops of the anterior thoracic nerves are lost in its