Flexor Digitorum Profundus

Digits Two and Three Anterior Interosseus Nerve, Median Nerve, Medial Cord, Anterior Division, Middle and Lower Trunk, C7, C8. Digits Four and Five Ulnar Nerve, Medial Cord, Anterior Division, Lower Trunk, C8, 11. 

Upper three-fourths of volar and medial surfaces of ulna and interosseus membrane. 

Volar surfaces of bases of distal phalanges of four fingers. 

Place tip of little finger on olecranon (O) and ring, middle and index fingers along shaft of ulna. Insert needle electrode just beyond tip of index finger just ulnarly to shaft. The ulnar innervated portion is the more superficial (1-2 cm), while the median innervated portion is deeper (3-5 cm). 

If the needle electrode is inserted too volarly it will be in the flexor carpi ulnaris. 

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So if we were to design barbed sutures for use with tissue anchors, the surface contact between the suture and the anchor eyelet should have minimum friction, which is possible by having no barbs in that region of the suture. The suture can go into the eyelet only once when anastomosing a distal flexor digitorum profundus tendon to the distal phalanx. 

Dovan, T. T., Gelberman, R. H., Kusano, N., Calcaterra, M. and SUva, M. J. (March 2005). Zone of flexor digitorum profundus repair An ex vivo biomechanical... 

Figure 9.5 MRI scan at mid-forearm level showing selective signal change in the flexor digitorum profundus (FDP arrow) and not in the flexor digitorum sublimis (FDS arrowhead). FPL, flexor poUids longus R, radius U, ulna II and V refer to the portions of those muscles - i.e., FDP and FDS - that flex the second (II) and fifth (V) digits of the hand. (Reproduced from Takamure et al. [39], with permission of the author and publisher.)...

At the volar aspect of the wrist, nine flexor tendons enter the carpal tunnel to reach the fingers. There are four tendons from the flexor digitorum superficialis for the second through fifth fingers, four from the flexor digitorum profundus for the same fingers and the flexor pollicis longus tendon. 

Fig. 10.27a,b. Bifid median nerve, a Schematic drawing and b corresponding transverse 12-5 MHz US image over the ventral wrist in an asymptomatic subject reveal the radial and ulnar trunks (arrows) of a bifid median nerve. Sea, scaphoid Pis, pisiform Jpl, flexor pollicis longus tendon p and s, the tendons of the flexor digitorum profundus and superficialis... 

Fig. 10.33 a,b. Schematic drawings illustrate typical sites of overuse tendinopathies in the a dorsal and b ventral wrist, including Ay de Quervain tenosynovitis B, intersection syndrome C,extensor pollicis longus tenosynovitis, ),extensor carpi ulnaris tenosynovitis E, flexor carpi radialis tenosynovitis F, flexor digitorum superficialis and flexor digitorum profundus tenosynovitis Gy flexor carpi ulnaris tendinopathy... 

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