. Cunningham's Text-book of anatomy. Anatomy. 5SS THE MUSOULAE SYSTEM. 2. Intermediate Layer. M. Flexor Digitorum Sublimis.âThe flexor digitorum sublimis occupies a deeper plane than the four previous muscles. It has a threefold origin, from the humerus, radius, and ulna. (1) The chief or humeral head of origin is from the medial epicondyle of the humerus by the common tendon, from the ulnar collateral ligament of the elbow, and from adjacent intermuscular septa. (2) The ulnar head of origin is by a slender fasciculus from the medial border of the coronoid process of the ulna, proximal and med
. Cunningham's Text-book of anatomy. Anatomy. 5SS THE MUSOULAE SYSTEM. 2. Intermediate Layer. M. Flexor Digitorum Sublimis.âThe flexor digitorum sublimis occupies a deeper plane than the four previous muscles. It has a threefold origin, from the humerus, radius, and ulna. (1) The chief or humeral head of origin is from the medial epicondyle of the humerus by the common tendon, from the ulnar collateral ligament of the elbow, and from adjacent intermuscular septa. (2) The ulnar head of origin is by a slender fasciculus from the medial border of the coronoid process of the ulna, proximal and medial to the origin of the pronator teres (Fig. 348, p. 389). (3) The radial head of origin is from the proximal two-thirds of the volar margin of the radius by a thin fibro- muscular attachment (Fig. 348, p. 389). The muscle divides in the distal third of the forearm into four parts, each provided with a separate tendon which goes beneath the transverse car- '^-Expansion of extensor tendon pgj ligament, paSSeS through the palm /Z~W Flexor digitoeum n ,t_ â > j j j. j oi the hand, and enters the correspond- ing digital sheath of the finger. At the wrist the four tendons are arranged in pairs, those for the middle and ring fingers in front, and those for the fore and little fingers behind, and are sur- rounded by a synovial sheath, along with the tendons of the flexor digi- torum profundus, beneath the trans- verse carpal ligament. In the palm of the hand the tendons separate, and conceal the deep flexor tendons and lumbrical muscles. Within the digital sheath each tendon is split into two parts by the tendon of the flexor digitorum pro- fundus ; after surrounding that tendon the two parts are partially re-united on its deep surface, and are inserted, after partial decussation, in two portions into the sides of the second phalanx. The vincula tendinum form additional insertions of the muscle. They consist of delicate bands of connective tissue enveloped in synovial membr
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