The Anterior Compartment of the Forearm

Question 1

Answer 1

Question 1

the muscles of the anterior compartment of the forearm facilitate which movements?

Answer 1

• flexion of the wrist and digits
• pronation of the forearm at the radio-ulnar joint

Question 2

Answer 2

Question 3

which superficial flexor forearm muscle is absent in about 20% of people?

Answer 3

palmaris longus

Question 4

Answer 4

Question 5

what is the action of the pronator teres?

Answer 5

pronation

Question 6

apart from flexing the wrist, wich superficial muscle is involved in adduction (ulnar deviation) of the wrist joint?

Answer 6

flexor carpi ulnaris

Question 7

apart from flexing the wrist, which superficial muscle is involved in abduction (radial deviation) of the wrist joint?

Answer 7

flexor carpi radialis

Question 8

Three superficial muscles of the anterior compartment of the forearm are supplied by the blank nerve (C5-T1) with the blank nerve (C8-T1) supplying the flexor carpi ulnaris muscle.

Answer 8

Three superficial muscles are supplied by median nerve (C5-T1) with the ulnar nerve (C8-T1) suppling the flexor carpi ulnaris muscle.

Question 9

what is the anatomical location of the flexor digitorum superficialis (FDS)?

Answer 9

• lies immediately deep to the superficial group of flexors in the forearm and is seen as the only muscle on the intermediate group of the forearm.

Question 10

the flexor digitorum superficialis has an extensive origin in the forearm, and passes distally down the arm giving rise to how many tendons?

Answer 10

4 tendons

Question 11

to which digits (fingers) are the tendons of the flexor digitorum superficialis (FDS) attached?

Answer 11

2-5 digits (no thumb)

Question 12

on which phalanx are the 4 tendons of the flexor digitorum superficialis (FDS) inserted?

Answer 12

middle phalanges of digits 2-5

Question 13

the flexor digitorum superficialis (FDS) flexes which joints?

Answer 13

• wrist joint
• metacaropophalangeal joints
• proximal interphalangeal joints

Question 14

can the flexor digitorum superficialis (FDS) act on the distal interphalangeal joint?

Answer 14

no (FDP) acts on distal

Question 15

what nerve innervates the flexor digitorum superficialis (FDS)?

Answer 15

median nerve C5-T1

Question 16

what is the main action of the brachioradialis muscle?

Answer 16

flexion of the elbow

Question 17

which nerve innervates the brachioradialis muscle?

Answer 17

radial nerve

Question 18

which muscle is the exception to the rule that all flexors lie in the anterior compartments of the forearm, and that the radial nerve only innervates extensor muscles?

Answer 18

brachioradialis

Question 19

label the 3 deep muscles of the anterior forearm

Answer 19

Question 20

Answer 20

Question 21

all the flexor muscles acting on the wrist and the fingers originate from?

Answer 21

medial epicondyle of humerus

Question 22

all of the extensor muscles acting on the wrist and fingers originate from?

Answer 22

the lateral epicondyle of the humerus

Question 23

describe the flexor digitorum profundus (FDP)

Answer 23

Flexor Digitorum Profundus (FDP)
FDP is a long, thick muscle that lies deeply in the front of the forearm. It also lies more superficially on the medial border and back of the forearm.

Question 24

what is the main action of the FDP on the wrist and finger joints?

Answer 24

- flexion of wrist - flexion of finger joints (metacarpophalangeal, distal interphalangeal)

Question 25

what is the nerve supply of the FDP?

Answer 25

dual nerve supply: - medial half supplied by the ulnar nerve - lateral half is supplied by the median nerve

Question 26

waht does pollicis mean?

Answer 26

thumb

Question 27

what does brevis mean?

Answer 27

short

Question 28

what does profundus mean?

Answer 28

deep

Question 29

what does quadratus mean?

Answer 29

square/rectangular

Question 30

The flexor pollicis longus (FPL) is the long flexor of the thumb. Which nerve innervates this muscle?

Answer 30

median nerve

Question 31

what is the origin and insertion of the pronator quadratus?

Answer 31

Lies deeply in the distal part of the forearm, taking origin from the front of the ulna, and passing across to be inserted into the radius.

Question 32

what is the innervation of the pronator quadratus?

Answer 32

median nerve

Question 33

what is the action of the pronator quadratus?

Answer 33

Pronator Quadratus works in synergy with the pronator teres muscle and form a powerful pair of pronators at both the proximal and distal radioulnar joints.