334 



THE MUSCLES 



MUSCLES OF THE HAXD 



The muscles of the hand proper consist: — first, of a superficial one, which lies 

 upon the ])ahnar fascia; and, secondly, of a deeper set, which may be divided into a 

 central group l)elonging to the fingers generally, and two other groujis. which are 

 associated with the thumb on the radial, and the little finger on the ulnar side of 

 the palm. 



Superficial Muscle of the Hand 



PALMARIS BREVIS 



The palmaris brevis (fig. 280) — named from its position in the palm of the 

 hand, and its small size — is a small quadrilateral sheet. 



Fig. 279.— Diagram of a Vertical Section through the Middle of the Hand. 



Posterior annular ligament 



Deep transverse ligament 

 Attachment of common extensor 

 to first phalanx 



Superficial transverse ligament 



Vincula accessoria 



Attachment of common extensor 

 to second phalanx 



Attachment of common extensor 

 to third phalanx 



Great palmar bursa 



Anterior annular ligament 



Dorsal interosseous 

 Lumbriealis 

 Palmar fascia 



Flexor profundus digitorum 



Flexor sublimis digitorum 



Ligamentum vaginale 

 Vincula accessoria 



Origin. — f 1) The front of the lower part of the anterior annular ligament about 

 its middle; and (2) the adjacent part of the palmar fascia at the inner edge of its 

 great central division. 



