SHOULDER, ARM, FOREARM, AND HAND. 



*59 



6. The anterior annular ligament on front of carpus. 



7. The musculi lumbricales on flexor tendons. 



8. The thenar and hypothenar muscles about thumb and little finger. 



9. The deep palmar arch and branches below the flexor tendons. 



10. The deep palmar branch of the ulnar nerve with deep arch. 



1 1. The dorsal interossei muscles. 



12. The ulnar nerve in the hand, supplying 1.5 fingers. 



13. Deep palmar arch and branches of ulnar nerve in the hand. 



14. The median nerve in the hand, supplying 3.5 fingers. 



15. The radial and ulnar arteries in the hand, forming the arches. 



1 6. The palmar interosseous muscles on the palmar surface. 



Dissection. The palmar fascia is the deep fascia of the flexor surface of the 



MEDIAN NERVE 



BRANCH TO MUSCLES 

 OF THUMB 



COLL A TERAL 

 BRANCHES OF 

 MEDIAN 



ULNAR NERVE 



COMMUNICA TION 

 BETWEEN MEDIAN 

 AND ULNAR 



COLLATERAL 

 BRANCHES OF 

 ULNAR 



FIG. in. SUPERFICIAL NERVES OF 'IHE PALM. (Ellis.) 



hand from the annular ligament above to the clefts of the fingers below. Having 

 removed the skin of the palm, and noticed the granular fat in the superficial 

 fascia thereof, you are now ready to study the palmar fascia. This fascia has 

 three divisions : (i) An inner thin part that covers the muscles forming the ball 

 of the little finger ; (2) an outer thin part that covers the muscles forming the 

 bail of the thumb ; (3) a central strong portion, investing the central distributory 

 region of the hand, in such a way as to protect the vessels and nerves for the 

 supply of the fingers and adjacent structures. The palmar fascia is continuous 

 above with the anterior annular ligament, and below with the ligamenta vaginales 

 in the form of heavy protective sheaths for the flexor tendons of all the fingers. 

 Figure 1 10 shows this ligamentum vaginale still intact in the little finger. 



The Flexor Tendons and Ligamenta Vaginales. Cut through the very 



