DEEP FASCIA . 37 



Costo- Coracoid Membrane, a process of the deepjfascia cover' 

 ing pectoralis minor, which, after splitting to enclose subclavius, 

 becomes attached to the first costal cartilage and the coracoid 

 process. The membrane itself is thin and pierced by superficial 

 vessels, but the piece between the costal cartilage and coracoid 

 process is much stronger, and is called the costo-coracoid liga- 

 ment. 



Axillary Fascia, a particularly strong fascia forming the floor 

 of the axillary space, from the edge of the pectoralis major in 

 front to the latissimus dorsi and teres major behind ; it is con^ 

 tinuous with the deep fascia of the arm. 



Bicipital Fascia, a strong band of fascia from the tendon of 

 the biceps, which joins the deep fascia covering the front of the 

 elbow. It separates the brachial artery from the median basilic 

 vein. 



Anterior annular ligament, a band of transverse fibres in the 

 deep fascia attached on the ulnar side to the pisiform bone and 

 the hook of the unciform, and on the radial side to the scaphoid 

 and trapezium. It bridges across the concavity of the carpus 

 and holds the flexor tendons in place. All the tendons pass 

 under it, except palmaris longus and flexor carpi radialis, the 

 latter piercing the ligament to reach its insertion. The ulnar 

 artery and nerve cross over the ligament". 



Posterior annular ligament, a 'transverse band of fibres in the 

 deep fascia, attached to tne external border of the lower end of 

 the radius, and the internal border of the lower end of the ulna. 

 This is a much weaker and less important band than the anterior 

 one. All the tendons pass underneath it, the ulnar and radial 

 nerves passing over it. 



The fascia is divided underneath into six compartments for 

 the passage of the tendons, which lie in grooves in the bone. 



1 . Extensor ossis metacarpi "1 . 



. . in the nrst groove on the ex- 



pollicis . ... e ... 



,,_: . ,,. . ternal side of the radius. 



Jbxtensor brevis pollicis J 



2 . Extensor carpi radiales, } . 



un the second groove, 

 longior and brevior 



3. Extensor longus pollicis in the third groove. 



