Extensor carpi radialis longus muscle

The video tutorial explains the extensor carpi radialis longus muscle, located in the posterior forearm. It originates from the lateral supracondylar ridge of the humerus and extends to the second metacarpal bone. This muscle extends and abducts the hand at the wrist, with motor innervation provided by the radial nerve.

Where does the extensor carpi radialis longus muscle originate?

• Lateral supracondylar ridge of the humerus

• Medial epicondyle of the humerus

• Coracoid process of the scapula

• Olecranon of the ulna

What is the insertion point of the extensor carpi radialis longus muscle?

• Base of the second metacarpal bone

• Base of the first metacarpal bone

• Base of the fourth metacarpal bone

• Base of the third metacarpal bone

Which movement is facilitated by the extensor carpi radialis longus muscle?

• Flexion of the hand at the wrist

• Extension of the hand at the wrist

• Pronation of the forearm

• Supination of the forearm

What additional movement does the extensor carpi radialis longus muscle assist with due to its radial positioning?

• Adduction of the hand at the wrist

• Extension of the fingers

• Abduction of the hand at the wrist

• Flexion of the fingers

Which nerve is responsible for the motor innervation of the extensor carpi radialis longus muscle?

• Musculocutaneous nerve

• Median nerve

• Ulnar nerve

• Radial nerve