Anterior Forearm

Question 1

A patient presents with difficulty in making a fist. Her hand and wrist are hyperextended and she is unable to flex their 4th and 5th digits. Which nerve is affected? Where along its course is it most likely injured?
_______ Nerve
a) posterior to medial epicondyle of humerus
b) in the cubital tunnel
c) near the wrist
d) in the hand

Answer 1

Ulnar Nerve

EDIT

Question 2

Blood supply to anterior forearm?

Answer 2

• ulnar artery

- anterior interosseous artery (via common interosseous artery)

Question 3

Blood supply to posterior forearm?

Answer 3

• radial a.
• recurrent interosseous a.
• posterior interosseous a.
• ulnar a.

Question 4

Blood supply to anterior hand?

Answer 4

Ulnar a. => superficial palmar arch

Radial a. => deep palmar arch

Question 5

Pronator teres

• origin
• insertion
• actions
• blood supply
• innervation

Answer 5

• anterior forearm
• coronoid process (ulna)
• middle of lateral surface of radius
• pronation & flexion of forearm @ elbow
• anterior ulnar recurrent a.
• median nerve (C6,C7)

Question 6

Pronator quadratus

• Origin
• Insertion
• Actions
• Blood supply
• Innervation

Answer 6

• distal 1/4 of anterior surface of ulna
• distal 1/4 of anterior surface of radius
• pronation of forearm, deep fibers bind radius & ulna together
• anterior interosseous artery
• median nerve via Anterior interosseous nerve (C8, T1)

Question 7

Anatomical relationships from lateral to medial in the anterior forearm?

Answer 7

• Superficial branch (Radial N.)
• Radial A.
• Median N.
• Ulnar A.
• Ulnar N.

Question 8

Ulnar Nerve Relationships within anterior forearm?

Answer 8

• posterior to the medial epicondyle
• runs along the medial forearm under the flexor carpi ulnaris (FCU)
• goes through Guyon’s canal (lateral to the pisiform bone)
• enters the hand & supplies most of the intrinsic muscles of the hand.

Question 9

A patient presents with difficulty in making a fist. Her hand and wrist are hyperextended and she is unable to flex their 4th and 5th digits. Which nerve is affected? Where along its course is it most likely injured?
_______ Nerve
a) posterior to medial epicondyle of humerus
b) in the cubital tunnel
c) near the wrist
d) in the hand

Answer 9

Ulnar Nerve

EDIT

Question 10

Blood supply to anterior forearm?

Answer 10

• ulnar artery

- anterior interosseous artery (via common interosseous artery)

Question 11

Blood supply to posterior forearm?

Answer 11

• radial a.
• recurrent interosseous a.
• posterior interosseous a.
• ulnar a.

Question 12

Blood supply to anterior hand?

Answer 12

Ulnar a. => superficial palmar arch

Radial a. => deep palmar arch

Question 13

Pronator teres

• origin
• insertion
• actions
• blood supply
• innervation

Answer 13

• anterior forearm
• coronoid process (ulna)
• middle of lateral surface of radius
• pronation & flexion of forearm @ elbow
• anterior ulnar recurrent a.
• median nerve (C6,C7)

Question 14

Pronator quadratus

• Origin
• Insertion
• Actions
• Blood supply
• Innervation

Answer 14

• distal 1/4 of anterior surface of ulna
• distal 1/4 of anterior surface of radius
• pronation of forearm, deep fibers bind radius & ulna together
• anterior interosseous artery
• median nerve via Anterior interosseous nerve (C8, T1)

Question 15

Anatomical relationships from lateral to medial in the anterior forearm?

Answer 15

• Superficial branch (Radial N.)
• Radial A.
• Median N.
• Ulnar A.
• Ulnar N.

Question 16

Ulnar Nerve Relationships within anterior forearm?

Answer 16

• posterior to the medial epicondyle
• runs along the medial forearm under the flexor carpi ulnaris (FCU)
• goes through Guyon’s canal (lateral to the pisiform bone)
• enters the hand & supplies most of the intrinsic muscles of the hand.