. Text-book of operative surgery . ls branch (n. cutaneus antebrachii dorsalis) whichis distributed on the back of the forearm pierces the fascia in the external bicipitalsulcus below the middle of the arm (vide Fig. 5). (c) The posterior interosseous nerve (iamus profundus). (Fig. 126.) Theposterior interosseous nerve is the motor nerve to the supinators and extensors in theforearm. To expose it an incision is carried vertically downwards from the head ofthe radius, along the radial aspect of the posterior surface of the forearm, in theinterval between the radial extensors and the tendinous e
. Text-book of operative surgery . ls branch (n. cutaneus antebrachii dorsalis) whichis distributed on the back of the forearm pierces the fascia in the external bicipitalsulcus below the middle of the arm (vide Fig. 5). (c) The posterior interosseous nerve (iamus profundus). (Fig. 126.) Theposterior interosseous nerve is the motor nerve to the supinators and extensors in theforearm. To expose it an incision is carried vertically downwards from the head ofthe radius, along the radial aspect of the posterior surface of the forearm, in theinterval between the radial extensors and the tendinous extensor communis fascia is divided between the glistening tendinous origin of the extensor communisdigitorum and the muscular fibres of the radial extensors, the latter being drawnforwards with blunt liooks. The supinator brevis muscle now appears, the fibres ofwhich pass in a characteristic manner obliquely downwards and forwards. The nerve 551 Long head of triceps m. Teres major m Long head of triceps Musculo-spirE. —Deltoid m. Teres minor m. (1)■ Circumflex n.— rosterior circumflex a. Deltoid m. Superior profunda a-Long head of triceps m. Outer head of triceps m Deltoid m. (2) Outer head of triceps m. Coraco-braohialis m. Musciilo-spiral n. andsuperior profunda a. (3) Outer head of triceps cutaneous u. Tendon of triceps. Supinator longus m. Fig. 125.—(1) Ligature of posterior circumflex artery, circumflex nerve. (2) and (3) Musculo-spiralnerve and superior profunda artery. 552 OPERATIVE SURGERY issues froni the muscle about 5 cm. (2 in.) below the liead of the radius, and at oncebreaks up into several branclies. To expose tlie trunk of the nerve for a greaterextent, the supinator brevis muscle is divided in an upward direction. The forearmis flexed and lield in a position midway between pronation and supination. Longerbranches of the nerve pass between the extensor communis and radial extensors to theextensors of the thumb and index finger, w
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