FOREARM- EXTENSOR

Question 1

What is the origin of the Supinator muscle?

Answer 1

Lateral epicondyle of the humerus, crest of the ulna, supinator fossa, radial collateral and ulnar ligaments

The supinator muscle is primarily responsible for forearm supination.

Question 2

Where does the Supinator muscle insert?

Answer 2

Surface of the proximal third of the radial shaft

The insertion allows for the supination of the forearm.

Question 3

What is the innervation of the Supinator muscle?

Answer 3

Deep branch of the radial nerve

This nerve is crucial for the motor function of the supinator muscle.

Question 4

What is the primary function of the Supinator muscle?

Answer 4

Forearm supination

Supination is the action of rotating the forearm so that the palm faces upwards.

Question 5

What is the origin of the Extensor Digitorum muscle?

Answer 5

Lateral epicondyle of the humerus

This muscle is essential for finger extension.

Question 6

Where does the Extensor Digitorum muscle insert?

Answer 6

Posterior surfaces of the middle and distal phalanges (2nd-5th)

Its insertion allows for the extension of the fingers.

Question 7

What is the innervation of the Extensor Digitorum muscle?

Answer 7

Posterior interosseus nerve

This nerve supplies the extensor muscles in the forearm.

Question 8

What is the function of the Extensor Digitorum muscle?

Answer 8

Extension of the index, middle, ring and little finger

This muscle plays a key role in finger movements.

Question 9

What is the origin of the Extensor Carpi Ulnaris muscle?

Answer 9

Lateral epicondyle of the humerus, posterior border of the ulna

This muscle contributes to wrist movements.

Question 10

Where does the Extensor Carpi Ulnaris muscle insert?

Answer 10

Medial side of the base of the metacarpal

Its position allows it to assist in wrist actions.

Question 11

What is the innervation of the Extensor Carpi Ulnaris muscle?

Answer 11

Posterior interosseus nerve

This innervation is important for its extensor function.

Question 12

What are the functions of the Extensor Carpi Ulnaris muscle?

Answer 12

Extension and adduction of the wrist

It helps in moving the wrist backward and towards the body.

Question 13

What is the origin of the Extensor Carpi Radialis Longus muscle?

Answer 13

Lateral supra-epicondylar bridge of humerus

This muscle aids in wrist movement.

Question 14

Where does the Extensor Carpi Radialis Longus muscle insert?

Answer 14

Base of the 2nd metacarpal

This insertion supports its role in wrist actions.

Question 15

What is the innervation of the Extensor Carpi Radialis Longus muscle?

Answer 15

Radial nerve

The radial nerve is crucial for the function of the extensor muscles.

Question 16

What are the functions of the Extensor Carpi Radialis Longus muscle?

Answer 16

Extension and abduction of the hand at the wrist joint

This muscle helps in moving the hand backward and away from the body.

Question 17

What is the origin of the Extensor Carpi Radialis Brevis muscle?

Answer 17

Lateral epicondyle of humerus

This muscle is involved in wrist extension.

Question 18

Where does the Extensor Carpi Radialis Brevis muscle insert?

Answer 18

Base of the 3rd metacarpal

This insertion also contributes to wrist movement.

Question 19

What is the innervation of the Extensor Carpi Radialis Brevis muscle?

Answer 19

Deep branch of radial nerve

This innervation is necessary for the muscle’s extensor action.

Question 20

What are the functions of the Extensor Carpi Radialis Brevis muscle?

Answer 20

Extension and abduction of the hand at the wrist joint

Similar to the longus, it assists in moving the hand backward and away from the body.

Question 21

What is the origin of the Extensor Indicis Proprius muscle?

Answer 21

Posterior side of the distal third of the ulnar shaft, interosseous membrane

This muscle is specific to the index finger.

Question 22

Where does the Extensor Indicis Proprius muscle insert?

Answer 22

External expansion of the 2nd digit

It allows for independent movement of the index finger.

Question 23

What is the innervation of the Extensor Indicis Proprius muscle?

Answer 23

Posterior interosseous nerve

This nerve is essential for finger extension.

Question 24

What is the function of the Extensor Indicis Proprius muscle?

Answer 24

Extension of the 2nd digit

It specifically extends the index finger.

Question 25

What is the origin of the Extensor Digiti Minimi muscle?

Answer 25

Lateral epicondyle of the humerus ## Footnote This muscle is responsible for extending the little finger.

Question 26

Where does the Extensor Digiti Minimi muscle insert?

Answer 26

Dorsal aponeurosis of the little finger ## Footnote Its insertion allows the little finger to extend.

Question 27

What is the innervation of the Extensor Digiti Minimi muscle?

Answer 27

Posterior interosseous nerve ## Footnote This innervation is crucial for the muscle's function.

Question 28

What is the function of the Extensor Digiti Minimi muscle?

Answer 28

Extension of the little finger ## Footnote It enables the little finger to move backward.

Question 29

What is the origin of the Brachioradialis muscle?

Answer 29

Proximal two-thirds of the supra-epicondylar ridge of the humerus ## Footnote This muscle aids in flexing the forearm.

Question 30

Where does the Brachioradialis muscle insert?

Answer 30

Lateral surface of the distal end of the radius ## Footnote Its insertion supports flexion during specific positions.

Question 31

What is the innervation of the Brachioradialis muscle?

Answer 31

Radial nerve ## Footnote This nerve is vital for the brachioradialis function.

Question 32

What is the function of the Brachioradialis muscle?

Answer 32

Forearm flexion, especially during mid-pronation ## Footnote It is most effective when the forearm is in a neutral position.