Forearm

Question 1

Radius orientation

Answer 1

lateral/thumb

Question 2

Ulna orientation

Answer 2

medial/pinky

Question 3

Elbow Joints

Answer 3

• Hinge joint: ulna w/ humerus
• Ball & socket: radius w/ humerus

Question 4

Interosseus Membrane

Answer 4

Connective tissue between ulna and radius holding them together/in place, restricting movement.

Surface for forearm muscle attachments

Disperses force from hand (when supinated) equally from radius to ulna

Question 5

Hand osteology - pollex

Answer 5

thumb

Question 6

hand osteoology - indicis

Answer 6

fingers

Question 7

hand osteology - digiti minimi

Answer 7

pinky

Question 8

Arteries of Forearm

Answer 8

• Brachial A. that splits to radial a. and ulnar a.

Question 9

Branch from Radial A.

Answer 9

Radial recurrent A.

Question 10

Branches from Ulnar A.

Answer 10

• Common interosseous A.
• Anterior interosseous A. (ultimately moves posterior)
• Posterior interosseous A.
• Recurrent interosseous A.

Question 11

Forearm Nerves

Answer 11

• Radial N: posterior innervation
• Median N: lateral innervation
• Ulnar N: medial innervation, NO branches

Question 12

Median Nerve’s Branch

Answer 12

Anterior interosseous N

Question 13

Radial Nerve’s Branches

Answer 13

1) superficial radial n.
2) deep radial n: passes the supinator m.

Question 14

Forearm Compartments

Answer 14

• Flexor Compartment (anterior)
  -Extensor Compartment (posterior)
• Mobile Wad Compartment (lateral)

Question 15

Forearm Flexors Orientation

Answer 15

Anterior and medial

Originate from medial side of distal humerus

Question 16

Forearm Extensors Orientation

Answer 16

Posterior and lateral

Originate from lateral side of distal humerus

Question 17

Forearm Flexor Superficial Components

Answer 17

• pronator teres m
• flexor carpi radialis m
• flexor carpi ulnaris m
• palmaris longus m

Question 18

Forearm Flexor Intermediate Component

Answer 18

• flexor digitorum superficialis m

Question 19

Forearm Flexor Deep Components

Answer 19

• flexor pollicis longus m
• flexor digitorum profundus m

Question 20

Pronator teres m

Answer 20

• Attach: medial epicondyle of humerus and proximal ulna
• Innervation: median n.
• Action: forceful and rapid forearm pronation, weakly flexes elbow

Question 21

Flexor carpi radialis m

Answer 21

• Attaches: medial epicondyle of humerus and ventral/lateral side of wrist
• Innervations: Median N.
• Actions: Flexes and aBducts wrist

Question 22

Flexor carpi ulnaris m

Answer 22

• Attaches: medial epicondyle of humerus and medial/ventral side of wrist
• Innervations: ULNAR N
• Actions: flexes and aDducts wrist

Question 23

Palmaris Longus M

Answer 23

• Attaches: medial epicondyle of humerus and flexor retinaculum and palmar aponeurosis
• Innervations: median n
  -Actions: flexes wrist, tenses palmar aponeurosis

Frequently absent in certain populations

Question 24

Flexor digitorum superficialis m

Answer 24

• Attaches: medial epicondyle of humerus, anterior radius (proximally), middle phalanges of DII-V
• Innervation: median n.
• Actions: flexes DII-V at first IP joints and MP joint, flexes wrist

Median N runs just deep to this muscle

Question 25

Flexor pollicis longus m

Answer 25

- Attaches: interosseous membrane and anterior radius , distal phalanx of DI (thumb) - Innervation: anterior interosseous n. - Actions: flexes IP joint of DI (thumb)

Question 26

Flexor digitorum of profundus m

Answer 26

-Attaches: interosseous membrane and ulnar shaft, distal phalanges of DII-V - Innervations: ulnar n and anterior interosseous n. - Actions: flexes distal IP joints of DII-V and assists wrist flexion

Question 27

Flexor Retinaculum

Answer 27

Holds flexor tendons in place

Question 28

Carpal Tunnel

Answer 28

all tendons of flexor digitorum, superficialis, profundus, flexor pollicis longus t 3and median n

Question 29

Pronator quadraus m

Answer 29

- Attaches: anterior surface of ulna and anterior surface of radius - Innervations: anterior interosseous n - Actions: pronates forearm

Question 30

Mobile Wad Components

Answer 30

Brachioradialis m, Extensor carpi radialis longus m and extensor carpi radialis brevis m All located postolaterally

Question 31

Brachioradialis m

Answer 31

- Attaches: distal humerus (lateral) and distal radius (lateral) - Innervations: superficial radial n. * superficial radial n. is deep to brachioradialis m - Actions: flexes elbow in (in neutral position)

Question 32

Extensor carpi radialis longus m and extensor carpi radialis brevis m

Answer 32

- Attaches: lateral supracondylar ridge and epicondyle, doral and lateral side of wrist - Innervation: deep radial n

Question 33

Extensor Compartment Components

Answer 33

Anconius m, extensor carpi ulnaris m, extensor digitorium m, extensor digiti minimi m, extensor expansion, supinator m, and deep extensor muscles