Question

What is the origin and insertion of the flexor pollicis longus muscle?

1) Origin: anterior surface of radius and interosseous membrane, Insertion: distal phalanx of thumb
2) Origin: posterior surface of radius and interosseous membrane, Insertion: proximal phalanx of thumb
3) Origin: anterior surface of ulna and interosseous membrane, Insertion: distal phalanx of thumb
4) Origin: posterior surface of ulna and interosseous membrane, Insertion: proximal phalanx of thumb

Answer 1

The flexor pollicis longus muscle originates on the anterior surface of the radius and interosseous membrane, and its insertion is the distal phalanx of the thumb.

Step-by-step explanation:

The flexor pollicis longus muscle is one of the muscles in the deep anterior compartment of the forearm, which is involved in the flexion of the fingers and thumb. Looking at the options provided, the correct origin and insertion for the flexor pollicis longus muscle would be:

1. Origin: anterior surface of the radius and interosseous membrane
2. Insertion: distal phalanx of the thumb

This means that the correct answer is 1) Origin: anterior surface of radius and interosseous membrane, Insertion: distal phalanx of thumb.