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Question 1

Superficial Forearm Flexors

Answer 1

1. Pronator teres- does not cross wrist
O: medial epicondyle and coronoid process
I: lateral mid-shaft of radius
A: pronate forearm and flex elbow
N: median

2. Flexor Carpi Radialis-
O: medial epicondyle 
I: 2nd and 3rd metacarpal
A: extends 2nd digit, flexes and radial deviates (abducts) wrist
N: median

3. Palmaris longus- absent in 10-15% of pop.
O: medial epicondyle 
I: palmar aponeurosis
A: flex wrist
N: median

4. Flexor Carpi Ulnaris-
O: medial epicondyle and olecranon 
I: pisiform and base of 5th metatarsal
A: flex and ulnar deviate (adduct) wrist
N: ulnar

Question 2

Intermediate Forearm Flexor

Answer 2

1. Flexor Digitorum Superficialis-
   O: medial epicondyle, coronoid process, and anterior radius
   I: base of middle phalanx of digits 2-5
   A: flexes PIP joints of 2nd-5th digits (up speed/strength of flexion)
   N: median

Question 3

Deep Forearm Flexors

Answer 3

1. Flexor Digitorum Profundus-
   O: anterior ulna and interosseous membrane
   I: base of distal phalanx of digits 2-5
   A: Flex DIP joints of 2nd-5th digits (flex slowly)
   N: Medial part- ulnar
   Lateral part- anterior interosseous (branch of median)

2. Flexor Pollicis Longus-
O: radius
I: distal phalanx of 1st digit
A: flexes thumb
N: anterior interosseous membrane (from median)

3. Pronator quadratus- doesn’t cross wrist
   O: distal radius and ulna, anterior to IM
   I: distal radius and ulna
   A: pronates Forearm
   N: anterior interosseous membrane (from median)

Question 4

Elbow Anastomosis Communication

Answer 4

1. Superior ulnar collateral
   Posterior ulnar recurrent
2. Inferior ulnar collateral
   Anterior ulnar recurrent
3. Middle collateral
   Recurrent interosseous
4. Radial collateral
   Radial recurrent

Question 5

2 Leftover Forearm Extensors

Answer 5

1. Brachioradialis- hammer curl, breaks rules
O: lateral supracondylar ridge
I: styloid process of radius
A: weak flexion of elbow
N: radial

2. Anconeus-
O: lateral epicondyle
I: olecranon process
A: extension of elbow and stabilizes elbow
N: radial

Question 6

Superficial Forearm Extensors

Answer 6

1. Extensor Carpi Radialis Longus-
O: lateral supracondylar ridge
I: base of 2nd metacarpal
A: extend and radially deviate (abduct) wrist
N: radial

2. Extensor Carpi Radialis Brevis-
O: lateral epicondyle
I: base of 3rd metacarpal
A: extend and radially deviate (abduct) wrist
N: radial (deep branch of radial)

3. Extensor Digitorum
   O: lateral epicondyle
   I: middle and distal phalanx of digits 2-5
   A: extends IP and MCP joints of digits 2-5
   N: posterior interosseous

4. Extensor digiti minimi
O: lateral epicondyle
I: extensor expansion of 5th digit
A: extends 5th digit at IP and MCP joints
N: posterior interosseous

5. Extensor Carpi Ulnaris
O: lateral epicondyle and ulna
I: base of 5th metacarpal
A: extends and ulnar deviates (adducts) wrist
N: posterior interosseous

Question 7

Deep Forearm Extensors

Answer 7

1. Abductor pollicis longus-
O: ulna and radius
I: base of 1st metacarpal
A: abduct thumb
N: posterior interosseous 

2. Extensor pollicis brevis-
O: radius
I: proximal phalanx of 1st digit
A: extends thumb across MCP joint
N: posterior interosseous

3. Extensor pollicis longus-
O: ulna
I: distal phalanx of 1st digit
A: extends thumb across IP joint
N: posterior interosseous 

4. Supinator-
O: lateral epicondyle
I: anterior-proximal radius
A: supinates forearm 
N: deep branch of radial (also posterior interosseous)

5. Extensor Indicis-
O: mid posterior ulna
I: extensor expansion of 2nd digit
A: extends 2nd digit
N: posterior interosseous