Manual of general, descriptive, and pathological anatomy (Volume 3).

  • Meckel, J. F. (Johann Friedrich), 1781-1833.
Date:
1832
Catalogue details

Licence: Public Domain Mark

Credit: Manual of general, descriptive, and pathological anatomy (Volume 3). Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    All these ramifications frequently anastomose with each other or with those of the ulnar nerve, and thus give rise to a plexus called the dorsal arch of the hand (rete, s. arcus dorsalis mamis). The deeper or larger muscular branch gives off branches for the ra- dialis brevis and the supinator brevis muscles ; it then turns over these muscles and engages itself between their fibres, penetrates between the extensor digitorum communis muscle, arrives at the posterior sur- face of the fore-arm, gives off some large branches, some of which are recurrent to the extensor digitorum communis, to the extensor minimi digiti, and to the ulnaris internus and externus muscles. Then as the external interosseus nerve (N. interosseous externus), it descends on the extensor and the adductor pollicis longus muscles, to which it sends filaments, as also to the extensor indicis proprius muscle, and is finally lost in the capsule of the wrist-joint. V. EXTERNAL CUTANEOUS NERVE. § 1838. The external cutaneous nerve, or muscido-cutaneous nerve, or the perforating nerve of Casserius, radio-cutane', Ch. (JV. culuneus externus, s. musculo-cutaneus, s. perforans Casserii), is much smaller than the preceding, although it descends almost as low as it. It arises from the fasciculi of the fifth, sixth, and seventh cervical nerves. It sometimes comes from the median nerve. It frequently but not always penetrates the coraco-brachialis muscle. When this is not the case, it passes on the internal edge of this muscle, being joined to it only at its surface. It divides high up in the arm into two branches, the one muscular and small, the other cutaneous and larger. The muscular branch gives filaments to the coraco-brachialis muscle, to the two heads of the biceps, and to the brachialis internus muscle. The cutaneous branch passing between the biceps and the brachialis internus muscle, arrives at the anterior edge of the arm, descends on the radial side in the aponeurosis,' accompanying the cephalic vein. It anas- tomoses frequently above with the external cutaneous nerve, and below with the dorsal branch of the radial nerve ; it is distributed to the skin of the posterior surface of the fore-arm and the hand, and terminates at the thumb. VI. MEDIAN NERVE. § 1839. The median nerve, medio-digilal, Ch. (JV. medianus), the largest nerve of the upper extremity, comes also from the brachial plexus. It descends on the inside of the arm near its lower extremity without giving off any branch, unless it be sometimes the external cutaneous nerve.