A&P 1.12

Question 1

Superficial Anterior Forearm Muscles

Brachioradialis

Answer 1

L: Anterior/lateral forearm superficial
O: Lateral supracondylar ridge of humerus
I: Styloid process of radius
A: Flexion of forearm at elbow

Question 2

Deep Anterior Forearm Muscles

Flexor Pollicis Longus

Answer 2

L: Anterior forearm deep
O: Proximal radius & interosseous membrane
I: Base of distal phalanx of thumb
A: Flexion of thumb

Tendon of this muscle is part of carpal tunnel

Question 3

Deep Anterior Forearm Muscles

Flexor Digitorum Profundus

Answer 3

L: Anterior forearm deep
O: Proximal 3/4 of ulna & interosseous membrane
I: Base of distal phalanges of medial 4 digits
A: Flexion of distal phalanges of medial 4 digits

Tendon of this muscle is part of carpal tunnel

Question 4

Intermediate Anterior Forearm Muscles

Flexor Digitorum Superficialis

Answer 4

L: Anterior forearm intermediate
O: - Humeroulnar head: medial epicondyle of humerus
- Radial head: Proximal 1/2 of radius
I: Bodies of middle phalanges of medial 4 digits
A: Flexion of intermediate phalanges of medial 4 digits

Tendon of this muscle is part of carpal tunnel

Question 5

Intermediate Anterior Forearm Muscles

Flexor Retinaculum (deep)

Transverse carpal ligament

Not a muscle

Answer 5

L: Roof of carpal tunnel
O: Attaches to hook of hamate & trapezium
I: n/a
A: Holds 9 tendons within the carpal tunnel in place

Question 6

Accessories of the Anterior Forearm

Median Nerve

Answer 6

• The nerve associated with carpal tunnel syndrome
• When inflammed, can lead to tingling, numbness, pain or even loss of function of lateral 3 digits and pollex

Question 7

Superficial Anterior Forearm Muscles

Flexor Carpi Radialis

Answer 7

L: Anterior forearm superficial
O: Medial epicondyle of humerus
I: Base of 2nd and 3rd metacarpals
A: Flexion & radial devation of hand at wrist

Question 8

Superficial Anterior Forearm Muscles

Flexor Carpi Ulnaris

Answer 8

L: Anterior forearm superficial
O: - Humeral head: Medial epicondyle of humerus
- Ulnar head: Olecranon & posterior border of ulna
I: Pisiform
A: Flexion & ulnar deviation of hand at wrist

Question 9

Superficial Anterior Forearm Muscles

Flexor Retinaculum

Not a muscle

Answer 9

L: CT band on anterior wrist
O: Meets extensor retinaculum at distal radius & ulna
I: n/a
A: Holds flexor tendons in place