Muscles Of Wrist And Hand

Question 1

Flexor carpi radialis (of wrist flexor group)

Answer 1

Origin- medial epicondyle of the humerus via the common flexor belly

Insertion- anterior hand on the radial side

Functions- flexes the hand at the wrist joint
Radially deviates the hand at the wrist joint

Question 2

Palmaris longus (of wrist flexor group)

Answer 2

Origin- medial epicondyle of the humerus via the common flexor belly

Insertion- palm of the head

Functions- flexes the hand at the wrist joint

Question 3

Flexor carpi ulnaris (of wrist flexor group)

Answer 3

Origin- medial epicondyle of the humerus via the common flexor belly and the posterior proximal of the ulna

Insertion- anterior hand on the ulnar side

Functions - flexes the hand at the wrist joint
Ulnar deviates the hand at the wrist joint

Question 4

Extensor carpi radialis longus

Answer 4

Origin- lateral supracondylar ridge of the humerus

Insertion- posterior hand on the radial side

Functions-
Extends the hand at the wrist joint
Radially deviates the hand at the wrist joint

Question 5

Extensor carpi radialis brevis

Answer 5

Origin- lateral epicondyle of the humerus via the common extensor belly

Insertion- posterior hand on the radial side

Functions-
Extends the hand at the wrist joint
Radially deviates the hand at the wrist joint

Question 6

Extensor carpi ulnaris

Answer 6

Origin- lateral epicondyle of the humerus via the common extensor belly and the posterior middle of the ulna

Insertion- posterior hand on the ulnar side

Functions-
Extends the hand at the wrist joint
Ulnar deviates the hand at the wrist joint

Question 7

Flexor digitorum superficialis

Answer 7

Origin- medial epicondyle of the humerus via the common flexor belly and the anterior ulna and radius

Insertion- anterior surface of fingers 2-5

Functions-
Flexes fingers 2-5 at the MCP and PIP joints
Flexes the hand at the wrist joint

Question 8

Flexor digitorum profundus

Answer 8

Origin- medial and anterior ulna

Insertion- anterior surface of fingers 2-5

Functions- flexes fingers 2-5 at the MCP and PIP and DIP joints
Flexes the hand at the wrist joint

Question 9

Flexor pollicis longus

Answer 9

Origin- anterior surface, coronoid process of the ulna

Insertion- thumb- anterior aspect of the base of the distal phalanx

Functions-
Flexes the thumb at the CMC, MCP and IP joints
Flexes the hand at the wrist joint

Question 10

Extensor digitorum

Answer 10

Origin- lateral epicondyle of the humerus via the common extensor belly

Insertion- phalanges of fingers 2-5

Functions-
Extends fingers 2-5 at the MCP, PIP and DIP joints
Extends the hand at the wrist joint

Question 11

Abductor pollicis longus

Answer 11

Origin- posterior middle radius and ulna

Insertion- thumb- lateral side of the base of the first metacarpal

Functions-
Abducts the thumb at the CMC joint
Extends the thumb at the CMC joint

Question 12

Extensor pollicis longus

Answer 12

Origin- the middle posterior ulna

Insertion- thumb- posterior surface of the distal phalanx of the thumb

Functions-
Extends the thumb at the CMC, MCP and IP joints

Question 13

Extensor indicis

Answer 13

Origin- posterior distal ulna

Insertion- index finger- attaches into the ulnar side of the tendon of the extensor digitorum

Functions-
Extends the index finger at the MCP, PIP and DIP joints
Extends the hand at the wrist joint

Question 14

Lumbricals manus

Answer 14

Origin- the distal tendon of the flexor digitorum profundus

Insertion- distal tendons of the extensor digitorum

Functions
Extend fingers 2-5 at the PIP and DIP joint
Flex fingers 2-5 at the MCP joints

Question 15

Palmar interossei

Answer 15

Origin- the metacarpals of fingers 2,4 and 5

Insertion- proximal phalanges of fingers 2,4,5 on the middle finger side

Functions-
Adduct fingers 2,4 and 5 MCP joints

Question 16

Dorsal interossei

Answer 16

Origin- the metacarpals of fingers 1-5

Insertion- proximal phalanges of fingers 2,3 and 4 on the side that faces away from the centre of the middle finger

Functions- abduct fingers 2-4 at the MCP joints