Wrist and Hand Muscle Description

Question 1

What is the Pronator teres -

• Action
• Origin
• Insertion
• Antagonist
• Nerve

Answer 1

• Action - Radioulnar pronation, Elbow flexion
• Origin - Medial epicondyle of the humerus (humeral head), Coronoid process (ulnar head)
• Insertion - Middle 1/3 of the lateral radius
• Antagonist - Supinator
• Nerve - Median nerve

Question 2

What is the Supinator -

• Action
• Origin
• Insertion
• Antagonist
• Nerve

Answer 2

• Action - Radioulnar supination
• Origin - Lateral epicondyle of humerus
• Insertion - Upper 1/3 of the posterior radius
• Antagonist - Pronator teres
• Nerve - Radial nerve

Question 3

What is the Extensor carpi radialis (longus) -

• Action
• Origin
• Insertion
• Antagonist
• Nerve

Answer 3

• Action - Wrist extension, Wrist radial deviation
• Origin - Superior to the lateral epicondyle of humerus
• Insertion - Base of 2nd metacarpal (dorsal surface)
• Antagonist - Flexor carpi ulnaris
• Nerve - Radial nerve

Question 4

What is Extensor carpi radialis (brevis) -

• Action
• Origin
• Insertion
• Antagonist
• Nerve

Answer 4

• Action - Wrist extension, Wrist ulnar deviation
• Origin - Lateral epicondyle of humerus
• Insertion - Base of 3rd metacarpal (dorsal surface)
• Antagonist - Flexor carpi ulnaris
• Nerve - Radial nerve

Question 5

What is the Extensor ulnaris -

• Action
• Origin
• Insertion
• Antagonist
• Nerve

Answer 5

• Action - Wrist extension, Wrist ulnar deviation
• Origin - Lateral epicondyle of humerus, Olecranon process
• Insertion - Base of 5th metacarpal (dorsal surface)
• Antagonist - Flexor carpi radialis
• Nerve - Radial nerve

Question 6

What is the Extensor digiti minimi -

• Action
• Origin
• Insertion
• Antagonist
• Nerve

Answer 6

• Action - 5th digit extension
• Origin - Lateral epicondyle of humerus
• Insertion - Base of the proximal phalange of the 5th digit (dorsal surface)
• Antagonist - Flexor digiti minimi
• Nerve - Radial nerve

Question 7

What is the Extensor digitorum communis -

• Action
• Origin
• Insertion
• Antagonist
• Nerve

Answer 7

• Action - Elbow extension, 2nd-5th digit extension
• Origin - Lateral epicondyle of humerus
• Insertion - Middle and distal phalange of the 2nd-5th digits (dorsal surface)
• Antagonist - Flexor digitorum
• Nerve - radial nerve

Question 8

What is the Extensor indicis -

• Action
• Origin
• Insertion
• Antagonist
• Nerve

Answer 8

• Action - 2nd digit extension
• Origin - Lower 1/3 of posterior ulna
• Insertion - Base of the proximal phalange of the 2nd digit (dorsal surface)
• Antagonist - Flexor digitorum
• Nerve - Radial nerve

Question 9

What is the Flexor carpi radialis -

• Action
• Origin
• Insertion
• Antagonist
• Nerve

Answer 9

• Action - Wrist flexion, Wrist radial deviation
• Origin - Medial epicondyle of the humerus
• Insertion - Base of 2nd and 3rd metacarpals (palmer surface)
• Antagonist - Extensor carpi ulnaris
• Nerve - Median nerve

Question 10

What is the Flexor carpi Ulnaris -

• Action
• Origin
• Insertion
• Antagonist
• Nerve

Answer 10

• Action - Wrist flexion, Wrist ulnar deviation
• Origin - Medial epicondyle of the humerus, Olecranon
• Insertion - Base of the 5th metacarpal (palmer surface), Pisiform, Hook of hamate
• Antagonist - Extensor carpi radialis
• Nerve - Ulna nerve

Question 11

What is the Profundus -

• Muscle group
• Action
• Origin
• Insertion
• Antagonist
• Nerve

Answer 11

• Muscle group - Flexor digitorum
• Action - 2nd-5th digit flexion
• Origin - Upper 1/2 of the anterior ulna
• Insertion - Distal phalange of the 2nd-5th digits (palmer surface)
• Antagonist - Extensor digitorum communis
• Nerve - Ulna nerve

Question 12

What is the Superficialis -

• Muscle group
• Action
• Origin
• Insertion
• Antagonist
• Nerve

Answer 12

• Muscle group - Flexor digitorum
• Action - 2nd-5th digit flexion, Elbow flexion
• Origin - Medial epicondyle of the humerus
• Insertion - Middle phalange of the 2nd-5th digits (palmer surface)
• Antagonist - Extensor digitorum communis
• Nerve - Ulna nerve