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Encyclopedia Britannica - Main :: MOS-NAN |
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MUSCLES OF THE UPPER EXTREMITY .The deltoid (see figs
shoulder cap and is used in abducting the arm to a right angle with the trunk; it runs from the clavicle, acromial process and spine of the scapula, to the middle of the humerus, and is supplied by the circumflex nerve , Several shortthe biceps (fig. 7), the long head of which rises from the top of the glenoid cavity inside the joint , while the short head comes from the coracoid process. The insertion is into the tubercle of the radius. These three muscles are all supplied by the same (musculo-cutaneous) nerve . At the back of the arm is the triceps (fig. 8) which passes behind both shoulder and elbow joints and is the great
long head rises from just below the glenoid cavity of the scapula, while the inner and outer heads come from the back of the humerus. It is inserted into the olecranon process of the ulna and is supplied by the musculo-spinal nerve. The muscles of the front of the forearm form superficial and deep sets (see fig. 7). Most of the superficial muscles come from the internal condyle of the humerus. From without inward they are the pronator radii teres going to the radius, the flexor carpi radialis to the base of the index metacarpal bone, the palmaris longus to the palmar fascia, the flexor sublimis digitorum to the middle phalanges of the fingers, and the flexor carpi ulnaris to the pisiform bone. The important56 points of practical
interest
ridge
phalanges of the fingers, the extensor minimi digiti, the extensor carp ulnaris passing to the metatarsal bone of the minimus, and the supinator brevis wrapping round the neck of the radius to which it is inserted. The aconeus which runs from the external condyle to the olecranon process is really a part of the triceps. The deep muscles rise from the posterior surfaces of the radius and ulna, and are the extensor ossis metacarpi pollicis, the name of which gives its insertion, the extensor brevis pollicis to the proximal phalanx, and the extensor longus pollicis to the distal phalanx of the thumb, while Axillary artery Musculocutaneous nerve Median nerve (outer head) Median nerve (inner bead) Ulnar nerve BRACHIO-RADIALIS Ulnar nerve End of Article: MUSCLES OF THE UPPER EXTREMITY If you wish, you can link directly to this article.
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