Which muscle abducts the joints of the thumb and wrist?

A) extensor digitorum
B) abductor pollicis longus
C) extensor indices
D) flexor pollicis longus


B
Explanation:
A) The extensor digitorum extends the joints at the fingers and wrist.
C) The extensor indices cause adduction and extension at the joints of the index finger.
D) The flexor pollicis longus causes flexion at the joints of the thumb.

Exercise 20: Post-Lab Questions

Anatomy & Physiology

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