166 SPECIAL ANATOMY. 



319. Fascia antibrachii s. vagina cubiti, passes off from the 

 f. brachii, enveloping the entire fore-arm as far as the Crista ulnse, 



serving at the upper part more especially for the attachment of 

 muscles. Fibrous striae serve to strengthen it which come off 

 behind, from the triceps, on the outside, from brachial intern., 

 and in front and internally from biceps, as well as those from the 

 condyles of the Humerus. Aponeurosis bicipitis passes over 

 pronator teres like a bridge at the bend of the arm, from the outer 

 border and the anterior surface of Biceps tendon, inwards and 

 downwards ; covering art. brachialis. Besides several vascular 

 and nervous openings, one should be observed in the fascia anti- 

 brachii at the bend of the arm (on the outer border of aponeurosis 

 bicipitis), through which the uniting tissue beneath the skin com- 

 municates with that under the fascia, and which leads to a fossa 

 in which the following parts are situated : Tendon of m. biceps, 

 Art. brachialis, commencement of Art. radial., Nerv. medianus. 

 The fossa is formed : on the outside by supinator long., extensores 

 carpi radial., flexor sublimis ; on the inside by pronator teres; 

 and communicates above with the canal of the Art. brachial., 

 below with those of the Art. radial., ulnaris, interossea, and 

 Nerv. medianus. In consequence of the attachment of the f. 

 antibrachii to the internal angle of Radius and the internal sur- 

 face of Ulna, a sheath arises from the muscles of the Volar and 

 another for those of the Dorsal surface, and besides, by inversions, 

 sheaths for the individual muscles. At the Carpal articulation it 

 forms, 



320. a. Lig. carpi volare; arises internally, 1. from Os pisi- 

 forme, 2. from Os hamatum, and continues externally, as it passes 



over befor the Volar surface of the carpus, to the Os naviculare 

 and Trapezium. Behind it lie, with one (or two) synovial cap- 

 sules, the nine tendons of the flexor muscles and nerv. medianus 

 in one bundle. Its superficial layer, lig. carpi volare commune, 

 is thin, its deep layer, lig. carpi volare proprium, strong. From 

 both the aponeurosis palmaris springs. 



321. b. Lig. carpi dorsale commune, very fibrous, passes 

 obliquely from crista radii over the radio-ulnar articulation to 

 the os triquetrum and the basis of the five metacarpal bones, and 

 then passes into thefasc. manus dorsalis. Prolongations which 

 pass off from the internal surface of Lig. dors, form the following 

 tendinous sheaths, from without inwards: 1. for abductor long. 

 and extens. brevis pollicis. 2. and 3. for extens. carp, radiates 

 and extens. pollicis longus (associated together below in one 

 sheath). 4. for extensor digitor. commun. and indicator. 5. 

 extens. digiti V. proprius. 6. for extensor carpi ulnaris. Each 

 tendon enjoys its own synovial capsule. 



