MSK Anatomy

Question 1

The thumb (1st metacarpal) has no __________ (whereas all the other metacarpals do)

Answer 1

intermediate phalanx

Question 2

The proximalrow of the carpals articulate with the ulna and radius and are comprised of

Answer 2

mn: So Long To Pinky

Scaphoid Lunate Triquetral Pisiform

mnemonic to know where to start (and to separate the triquetral and the pisiform): the scaphoid is Sizeable and the pisiform is closest to the pinky

or you can just remeber it’s going frtom lateral to medial

Question 3

the distal row from lateral to medial is

Answer 3

mn: Here Comes The Thumb (continuing in circular pattern from the pisiform)

Traprezium

Trapezoid

Capitate

Hamate

Question 4

what bones comprise the radiocarpal joint

Answer 4

indicated by red Xs

Question 5

extensor expansions

Answer 5

Question 6

Although there are 5 deep palmar muscles, there are only 3 interosseous muscles

They are:

Answer 6

1st palmar interosseus (2nd metacarpal)

2nd palmar interosseus (4th metacarpal)

3rd palmar interosseus (5th metacarpal)

Interossei are named such because they span between the 2 bones of 1 finger: the metacarpal and the proximal phalange

mn:

1. “interosseus” and “deep” both sound like a dirty word. … but ironically the two dirty fingers are the one’s left out of the action
2. notice, they all are located on the side of the finger pointing to the middle

Question 7

What do these two clinical signs mean

Answer 7

Sail sign indicates effusion

Fat pad sign is due to displacement during humeral fracture

Question 8

What muscles are these (and on what side of the hand)

Answer 8

dorsal interossei muscles

Question 9

What are these muscles (and on what side of the hand)?

Answer 9

palmar interossei

Question 10

what are the muscles of the thenar compartment

Answer 10

1. opponens pollicis
2. abductor pollicis brevis
3. flexor pollicis brevis

Question 11

what is the innervation of the thenar compartment muscles

Answer 11

Recurrent branch of median nerve

Question 12

the median nerve innervates which muscles of the hand

Answer 12

1/2 L.O.A.F

the first 2 lumbricals, opponens pollicis, abductor pollicis brevis and flexor pollicis brevis

Question 13

what is the actiofn of the lumbricals

Answer 13

extension of phalanges and flexion of metcarpal-phalangeal joint –> resulting in an L shape of the hand

mn: the lumbricals are Lob-sided. on the lateral side they are bipennate (2) and on the medial side they are unipennate (2)

Question 14

where specifically is the infection

Answer 14

hypothenar space

Question 15

where is the subaponeurotic space?

Answer 15

subaponeurotic space lies between the metacarpal bones and the extensor tendons (deep to the subcutaneous space)

Question 16

Answer 16

what pathology is shown

ossification of plantar fascia toward the calcaneus