Electro-physiology and electro-therapeutics : showing the best methods for the medical uses of electricity / By Alfred C. Garratt.
463/740

passes down between the biceps and brachialis anlicus to the outside of the bend of the el- bow ; after supplying the in- teguments there, it perforates the fascia, and divides into two cutaneous branches. Thus the external cutaneous nerve first supplies the coraco-brachialis, the biceps, and brachialis an- ticus in the upper arm, and then the integuments of the outer or radial side (both the dorsal and palmar) of the fore- arm, from the elbow to the wrist, giving twigs also to the synovial membranes of the wrist joint. The internal cutaneous nerve of the arm is smaller, and passes down the upper arm by the side of the basilic vein, giv- ing off many cutaneous brandi- es in its course. At about the middle of the upper arm it comes out of the deep fascia, and divides into several, all of which pass down the bend of the elbow, in front of or behind the median basilic vein, and descend in the course of the palmaris longus muscle, even to the front of the wrist, distributing branches to the integuments in their course, which is mainly on the palmar and outer margin of the forearm. The lesser cutaneous nerve arises from the great plexus, and is lost in the integuments back of the elbow, giving some twigs in its course to the middle posterior aspect of the Fig. 72. A View of the Brachial Plexus of Nerves, showing its Branches to the Arm. 1, 1. The Scalenius Anticus Muscle. 2, 2. The Great Median Nerve. 3. The Ulnar Nerve. 4. The Branch from the Median to the Biceps Muscle. 5. The Thoracic Nerves ; and just above is seen the Thoracic Loop, that supplies the Pectoralis Major and Minor Muscles. 6. The Phrenic Nerve, formed from the Third and Fourth Cervical.