Flexor Forearm Ch.13

Question 1

General considerations of flexor forearm compartment

Answer 1

1. attached to medial epicondyle via common flexor tendon
2. flex the digits
3. flex, abduct and adduct the hand at wrist
4. assist pronation of hand by actively rotating the radius on the ulna
5. to a lesser degree flex the forearm
6. All innervated by Median N. (beside flexor carpi ulnaris, and flexor digitorum profundus)

Question 2

supination vs. pronation (in regards to ulna vs. radius)

Answer 2

radius is on outside, ulna is on the inside. When pronation occurs the radius rotates around the humerus and the distal end ends up medially.

Question 3

Pronator Teres

Answer 3

A: pronates and slightly flexes forearm
N: Median

Question 4

Superficial Flexor Layer (from lateral–>medial)

Answer 4

pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris
TRLU: TeResa’s LongUnderwear

Question 5

Flexor Carpi Radialis

Answer 5

A: flexes wrist and abducts hand (radial deviation)
N: Median
“flexor goes to radial side”

Question 6

Palmaris Longus

Answer 6

A: flexes wrist
N: median n
“something goes into palm and is long”

Question 7

Flexor Carpi Ulnaris

Answer 7

A: Flexes wrist, adducts hand (ulnar deviation)
N: Ulnar N.
“flexor goes to ulnar side”

Question 8

Intermediate flexor layer

Answer 8

Flexor Digitorum Superficialis

Question 9

Flexor Retinaculum

Answer 9

• A specialization of deep fascia which spans the concavity created by carpal bones and forms the carpal tunnel
• (attached to trapezium and scaphoid laterally, the hamate/hamulus and pisiform medially)
• tendons of IM and deep layer as well as median nerve go through the carpal tunnel

Question 10

Flexor Digitorum Superficialis

Answer 10

(long powerful muscle not attached to thumb - attaches to middle phalanges 2-5)
A: flexes proximal I-P joints. Assists in flexion of the M-P joints, wrist and forearm
N: Median N.
“power grip”

Question 11

2 Flexors of Forearm not innervated by the Median N.

Answer 11

• Flexor Carpi Ulnaris

- Medial portion of Flexor Digitorum Profundus

Question 12

Flexor Digitorum Profundus

Answer 12

• go to tips of fingers for precise flexion of fingers
  A: flexion of distal IP joints; assists in flexion of proximal I-P, MP and wrist joints
  N: lateral portion (digits 2/3)= median n.
  medial portion (digits 4/5) = ulnar n.
  “precise flexion”

Question 13

Deep Flexor Layer

Answer 13

Flexor Digitorum Profundus, Flexor Pollicis Longus, Pronator Quadratus

Question 14

Flexor Pollicis Longus

Answer 14

A: Flexes thumb
N: median n.

Question 15

Pronator Quadratus

Answer 15

A: pronates hand
N: median n.