Electro-physiology and electro-therapeutics : showing the best methods for the medical uses of electricity / By Alfred C. Garratt.
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supplying the muscles of the little finger, and the interossei, and other deep structures in the ulnar side of the palm of the hand. There is also a dorsal branch of the ulnar nerve at the lower third of the forearm, that passes backward be- neath the tendon of the flexor carpi ulnaris, and divides into two branches which supply the integument along that side of the forearm, besides two fingers and a half, on their posterior aspect. Another anastomotic branch of the ulnar nerve arises about midway down the forearm, and this divides into two; the one accompanies the ulnar artery, the other pierces the deep fascia outwards, and is distributed along the integu- ment. The musculo-spiral nerve is the largest branch of the brachial plexus. It passes downward in front of the tendons of the lalis- simus dorsi and teres major muscles, then winds around the humerus in the spiral groove to the space between the brachialis anlicus and supinator longus, and thence downwards to the bend of the elbow, where it divides into two, the posterior interosseous and the radial nerve. The branches of the great musculo-spiral are, first, the muscular, which are distributed to the triceps, to the supinator longus, and to the extensor carpi radialis longior. The next is the spired cutaneous, that becomes superficial just below the insertion of the deltoid muscle, and this passes down the outer side of the arm and forearm as far as the wrist, and is lost in the integument. The next branch forms the radial nerve, which runs along the radial side of the forearm to the beginning of the lower third of it; and here it passes beneath the tendon of the supinator longus, but at about two inches above the wrist joint it comes out again, piercing the deep fascia, and dividing into two branches. The external of these is dis- tributed to the upper and outer or radial border of the hand and thumb. The internal branch crosses obliquely on the dorsum of the tensor tendons of the thumb, and divides into several fila- ments for the supply of the ulnar border of the thumb, the radi- al border of the index finger, and the neighboring borders of the index and middle fingers. The posterior interosseous branch separates from the radial at the bend of the elbow, as soon as