. Medical and surgical therapy. is major. Ext. anterior thoracic. C, C, C. Infraspinatus. Suprascapular. C». C. Teres minor. Circumjlex. C». Teres major. Nerre to teres major. C^ C, C. Pectoralis minor. Int. anterior thoracic. C, C*. D. Latissimus dorsi. Long subscapular. C*, C, C. Biceps. Musculo-cutaneous. C, anticus. ,, ,, C, C. Triceps. Musculo-spiral. C*, C. Supinator longus. ,, ,, C, €•. Ext. car. rad. long. ,, ,, C, C. Anconeus. ,, ,, C^C*. Ext. car. ulnaris. ,, ,, C, C». rad. brev. ,, •,. C, C. Ext. coram, dig. ., ,, C», C, C». Abd. long, pojlicis. ., ,, C, C. Ext
. Medical and surgical therapy. is major. Ext. anterior thoracic. C, C, C. Infraspinatus. Suprascapular. C». C. Teres minor. Circumjlex. C». Teres major. Nerre to teres major. C^ C, C. Pectoralis minor. Int. anterior thoracic. C, C*. D. Latissimus dorsi. Long subscapular. C*, C, C. Biceps. Musculo-cutaneous. C, anticus. ,, ,, C, C. Triceps. Musculo-spiral. C*, C. Supinator longus. ,, ,, C, €•. Ext. car. rad. long. ,, ,, C, C. Anconeus. ,, ,, C^C*. Ext. car. ulnaris. ,, ,, C, C». rad. brev. ,, •,. C, C. Ext. coram, dig. ., ,, C», C, C». Abd. long, pojlicis. ., ,, C, C. Ext. brev. pollicis. ,, ,, C«, C. Fig. 8.—Muscles supplied by themuscvlo-spiral nerve. Triceps. — The triceps for-cibly extends the forearm onthe arm. From Duchennesexperiments, it appears thatthe long head of the tricepsis the weakest, on account of want of stabilityin its upper attachment; but either the externalor internal head of the triceps can do all that isrequired, and when the triceps is entirely paralysed. THE MUSCULO-SPIRAL NERVE 29 the anconeus alone is capable of extending thearm. When a wound of the posterior part of the arm hasdirectly ajffected the nerve fibres of the external andinternal triceps, or of all three heads, without injuringthe trunk of the musculo-spiral nerve itseK, this wantof efficiency of the extensors of the forearm is notalways easy to detect. The patient can alternately flex and extend the fore-arm, holding a heavy weight in his hand ; but ifhe is made to raise his elbow high enough, with hisforearm flexed and his hand touching his shoulder, itbecomes impossible for him to extend this bent fore-arm by reason of the weight alone. Another way to test paralysis of the triceps is to ex-tend the elbow and then to ask the patient to resistmth vigour an attempt to flex the forearm onthe arm. When the lesion has involved the musculo-spiralnerve in the axillary region, the whole of the tricepsis paralysed. As a result, then, of atrophy of
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