814 MR. G. E. DOBSON ON THE ANATOMY [JuaC 21, 



with that of the pectoralis major; some of the fibres of its scapular 

 portion are inserted into the superficial fascia of the arm. Rhom- 

 boideus consists of two parts of nearly equal extent : the first arises 

 from the occipital bone under cover of part of the cleido-occipital 

 and the trapezius, the second from the ligameutum nuchse (as far 

 forwards as the second dorsal spine) and from two or three dorsal 

 spines, and is inserted into the inner side of the posterior margin of 

 the scapula external to the insertion of the occipital part. 



Latissimus dorsi divides near the axilla into two parts ; the smaller 

 is united to and inserted with the teres major ; the other part, many 

 times larger, after giving off the dmso-epitrochlearis, suddenly nar- 

 rows into a small tendon which is inserted into the bicipital groove. 

 The dorsn-epitrochlearis is enormous, covering the greater part of 

 the posterior and inner side of the arm ; it is inserted by a tendinous 

 expansion. 



The coraco-brachialis is closely united with the short head of the 

 biceps ; it is inserted into the humerus above the middle ; but a 

 fasciculus of muscular fibres continuous with it passes on with the 

 biceps, and is inserted with the latter into the radius. Covered by 

 this muscle at its origin, a short but broad muscle, the coraco-bra- 

 chialis brevis {rotator humeri. Wood) arises, aud is inserted into the 

 neck of the humerus below the lesser tuberosity. 



The extensor ossis metacarpi pollicis is very large, and has but 

 a single tendon, inserted into the proximal extremity of the first 

 metacarpal bone. 



Extensor secundi internodii pollicis is feeble, and has a single 

 long tendon. Extensor communis digitorum sends three tendons to 

 the three middle digits. Extensor minimi digiti forms two long 

 tendons in the arm, which are inserted into the outer and inner sides 

 of the fifth digit. Extensor indicis has also two tendons ; one goes 

 to the second digit, the other to the third, gives off also a tendon 

 to the fourth digit. There is no trace of an extensor primi inter- 

 nodii pollicis. 



Palmar is longus, arising with the flexor carpi radialis, is inserted 

 as usual into the palmar fascia, from which a muscular bundle of 

 fibres arises on the radial side, and is inserted into the integument 

 of the palm ; the corresponding integumentary muscle on the ulnar 

 side is the palmaris brevis, which arises wholly from the pisiform 

 bone and annular ligament. 



Flexor digitorum profundus arises by three heads, which, how- 

 ever, are closely connected together, the only approximately distinct ■ 

 one being tliat arising from the outer side of the ulna, which gives 

 origin to the tendon for the fifth digit. The tendon for the pollex 

 arises from the superficial surface of the common tendon ; it is very 

 much smaller than the other tendons. 



From the annular ligament near the insertion of the tendon of 

 the Jlexor carpi radialis arises a small muscle, the fibres of which 

 occupy a space scarcely exceeding that which would be taken by a 

 split pea ; this muscle forms a very slender tendon, which, passing 

 superficially across the large abductor pollicis, gets to the ulnar 



