DISSECTION OF THE HAND. 69 



it ends by anastomosing with the posterior iiiterosseous and carpal 

 arteries. 



Branches. Numerous offsets are given to the deep muscles. Branches: 



One long branch, median (/), accompanies the median nerve, m 

 which it supplies, and either ends in the flexor sublimis, or is con- m 

 tinned beneath the annular ligament to the palmar arch. 



Above the middle of the forearm the medullary arteries of the medullary to 

 radius and ulna arise from the vessel. aes> 



Where it is about to pass through the interosseous membrane and carpal, 

 it furnishes twigs to the pronator quadratus ; and one branch is 

 continued beneath that muscle to anastomose with the anterior 

 carpal arteries. 



The ANTERIOR INTEROSSEOUS NERVE (fig. 27, 2 ) is derived from Anterior 



the median, and accompanies the artery of the same name to the ^^emls 18 

 pronator quadratus muscle, the under-surface of which it enters. n pronator. 

 Branches are given by it to the flexor longus pollicis and to the outer 

 part of the flexor profundus digitorum muscles. 



Dissection. The attachment of the biceps and brachialis anticus Dissection, 

 to the bones of the forearm may be now cleaned and examined. 



The insertion of the brachialis anticus takes place by a broad thick Insertion of 

 tendon, about an inch* in length, which is fixed into the inner and anti?us. hS 

 lower parts of the rough impression on the front of the coronoid 

 process of the ulna. 



Insertion of the biceps. The tendon of the biceps is inserted into insertion of 

 the rough hinder part of the tuberosity of the radius, a bursa 

 separating it from the fore part of the prominence. Near its 

 attachment the tendon is twisted, so that the anterior surface be- 

 comes external. The supinator brevis muscle partly surrounds the 

 insertion. 



SECTION V. 



THE PALM OF THE HAND. 



Dissection (fig. 27, p. 72). The digits should be well sepa- Dissection. 

 rated and fixed firmly to a board with tacks, and the skin reflected 

 from the palm of the hand by means of two incisions. One is to be 

 carried along the centre of the palm from the wrist to the fingers ; Clean small 

 and the other is to be made from side to side at the termination of nTuscie, 

 the first. In raising the inner flap, the small palniaris brevis 

 muscle will be seen at the inner margin of the hand ; and its 

 insertion into the skin may be left till the muscle has been learnt. 



In the fat the ramifications of the palmar branches of the median and trace 

 j i L T. j cutaneous 



and ulnar nerves are to be traced. nerves. 



The student should remove the fat from the palniaris muscle, and Define the 

 from the strong palmar fascia in the centre of the hand ; and he {^scfa * 

 should take care not to destroy a fibrous band (transverse ligament) 

 which lies across the roots of the fingers. When, cleaning the fat 



