Posterior Forearm Muscles | Superficial Layer

The video tutorial explores the muscles of the posterior compartment of the forearm, focusing on their origins, insertions, functions, and innervations. It covers the extensor carpi ulnaris, extensor digiti minimi, extensor carpi radialis longus and brevis, extensor digitorum communis, brachioradialis, and anconeus. The tutorial highlights the role of these muscles in wrist and digit extension, as well as their contribution to elbow movements.

Which compartment of the forearm contains the wrist extensors?

• Medial compartment

• Lateral compartment

• Posterior compartment

• Anterior compartment

What is the primary function of the extensor carpi ulnaris?

• Extending the fingers

• Flexing the wrist

• Extending the wrist

• Flexing the fingers

Which nerve innervates the extensor digiti minimi?

• Radial nerve

• Median nerve

• Ulnar nerve

• Posterior interosseous nerve

Where does the extensor carpi radialis longus insert?

• Base of the first metacarpal

• Base of the second metacarpal

• Base of the third metacarpal

• Base of the fourth metacarpal

Which nerve innervates the extensor carpi radialis brevis?

• Radial nerve

• Deep radial nerve

• Ulnar nerve

• Posterior interosseous nerve

What is the primary action of the extensor digitorum communis?

• Flexing the wrist

• Extending the wrist

• Extending the fingers

• Flexing the fingers

Which muscle is most active in elbow flexion when the forearm is in mid pronation?

• Brachioradialis

• Brachialis

• Anconeus

• Biceps brachii

What is the primary function of the anconeus muscle?

• Extending the wrist

• Flexing the wrist

• Extending the elbow

• Flexing the elbow

Which muscle assists in preventing elbow joint capsule impingement?

• Brachioradialis

• Anconeus

• Extensor digitorum

• Triceps brachii

Which nerve innervates the brachioradialis?

• Ulnar nerve

• Radial nerve

• Posterior interosseous nerve

• Median nerve