Forearm, Wrist, Shoulder

Question 1

What phalange doe the thumb not have?

Answer 1

middle phalange

Question 2

Colles’ Fracture:

Answer 2

• “FOOSH” injury: fall on outstretched hand
• fracture of the distal radius
• broken end of the radius (styloid process) points upward, ulna styloid prominence
• “dinner fork” appearance

Question 3

What is this an image of?

Answer 3

Colles’ fracture

Question 4

Scaphoid fracture:

Answer 4

• FOOSH with impact on thenar prominence
• scaphoid usually fractures at waist
• blood enters scaphoid distally, fracture can lead to osteonecrosis of proximal fragment

Question 5

What is this an image of?

Answer 5

scaphoid fracture

Question 6

Radioulnar joint:

Answer 6

• annular ligament
• pronation/supination

Question 7

What bone is in red?

Answer 7

trapezium

• sits at base of thumb to form thumb carpometacarpal joint

Question 8

Wrist flexors:

Answer 8

• Flexor carpi radialis
• Flexor carpi ulnaris
• Palmaris longus

ALL ATTACH TO MEDIAL EPICONDYLE

Question 9

Digit flexors:

Answer 9

• Flexor digitorum superficialis (medial epicondyle)
• Flexor digitorum profundus (proximal ulna)
• Flexor pollicis longus (mid-distal radius)

Question 10

The three deep flexors innervated by the anterior interosseous nerve:

Answer 10

• flexor digitorum profundus (½AI; ½ U)
• flexor pollicis longus
• pronator quadratus

Question 11

Pronators and innervations:

Answer 11

• pronator teres (M)
• pronator quadratus (AI)

Question 12

Wrist Extensors:

Answer 12

• Extensor Carpi Radialis Longus (R)
• Extensor Carpi Radialis Brevis (DR)
• Extensor Carpi Ulnaris (PI)

ALL ATTACH TO LATERAL EPICONDYLE

Question 13

Superficial Digit Extensors:

Answer 13

• Extensor digitorum (PI)
• Extensor digiti minimi (PI)

Question 14

Deep muscles of the posterior forearm innervated by posterior interosseous nerve:

Answer 14

• Abductor Pollicis Longus (PI)
• Extensor Pollicis Brevis (PI)
• Extensor Pollicis Longus (PI)
• Extensor Indicis (PI)

Question 15

The only extensors not innervated by posterior interosseous nerve:

Answer 15

• Extensor Carpi Radialis Longus (R)
• Extensor Carpi Radialis Brevis (DR)

Question 16

Interossei that are adductors:

Answer 16

PAD

• palmar interossei adduct digits 2, 3, and 5

Question 17

Interossei that are abductors:

Answer 17

DAB

• dorsal interossei abduct digits 2, 3, and 4

Question 18

Contents of the carpal tunnel:

Answer 18

• 9 Flexor Tendons
• Median Nerve

Question 19

Result of Median Nerve Compression in the carpal tunnel:

Answer 19

• Paresthesia (“pins and needles”) in first 3.5 digits
• Motor Weakness
• Thenar Atrophy

Question 20

Thenar Muscles are innervated by:

Answer 20

Median Nerve

Question 21

Hypothenar Muscles are innervated by:

Answer 21

Deep Ulnar Nerve

Question 22

Interossei are innervated by:

Answer 22

Deep Ulnar Nerve

Question 23

Adductor Pollicis is innervated by:

Answer 23

Deep Ulnar Nerve

Question 24

Lumbrical injury will lead to:

Answer 24

claw-like appearance of hand

Question 25

Median nerve innervation in the hand:

Answer 25

• 2LOAF:
  
  • 2 Lumbricals (radial side)
  • Opponens Pollicis
  • Abductor Pollicis Brevis
  • Flexor Pollicis Brevis

Question 26

What is the arrow pointing to?

Answer 26

superficial palmar arch

Question 27

What is the arrow pointing to?

Answer 27

deep palmar arch