Dorsal interossei muscles of the hand

This tutorial covers the dorsal interossei muscles of the hand, explaining their anatomy, location, and function. These muscles, found in both the hand and foot, are bipennate and have two heads originating from adjacent metacarpal bones. The tutorial details the insertion points at the dorsal aponeurosis and proximal phalanx bases, highlighting their role in finger abduction and joint movements. Innervation is provided by the deep branch of the ulnar nerve. The video concludes with a call to explore more anatomy resources on Ken Hub.

What is the primary structural characteristic of the dorsal interossei muscles?

• They are unipennate muscles.

• They are bipennate muscles.

• They are fusiform muscles.

• They are circular muscles.

Where does the first dorsal interosseous muscle originate?

• Radial side of the index finger's metacarpal and ulnar side of the middle finger's metacarpal.

• Ulnar side of the thumb's metacarpal and radial side of the index finger's metacarpal.

• Radial side of the thumb's metacarpal and ulnar side of the index finger's metacarpal.

• Ulnar side of the index finger's metacarpal and radial side of the middle finger's metacarpal.

Which finger does the second dorsal interosseous muscle insert on?

• Ulnar side of the ring finger.

• Radial side of the middle finger.

• Radial side of the index finger.

• Ulnar side of the middle finger.

Which nerve innervates the dorsal interossei muscles of the hand?

• Deep branch of the ulnar nerve

• Superficial branch of the ulnar nerve

• Radial nerve

• Median nerve

What action do the dorsal interossei muscles perform on the fingers?

• Adduction of the fingers

• Abduction of the fingers

• Flexion of the distal interphalangeal joints

• Extension of the metacarpal phalangeal joints