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Laboratory 8. Palm of the Hand
Step 10. Long Flexor Tendons in the Hand

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Retract, or cut and reflect, the tendons of the flexor digitorum superficialis [Step 2] to expose the tendons of the flexor digitorum profundus muscle and flexor pollicis longus muscle [tendon] [muscle belly]. Confirm the identification of these tendons by tracing them proximally to the muscle bellies that are located in the forearm. Now, examine the course of each tendon in the hand.

The tendon of the flexor pollicis longus muscle is located lateral to tendons of the flexor digitorum profundus muscle. Along the first metacarpal bone, the tendon of the flexor pollicis longus muscle lies medial to the flexor pollicis brevis muscle. Distally, the tendon of the flexor pollicis longus muscle inserts into the distal phalanx of the thumb.

Links and References:
Grant's: 6.99-6.100
Netter (1ed.): 422 and 433-437 (2ed.): 418 and 429-433
Rohen/Yokochi: 367, 368 and 370