B7.018 Forearm, Cubital Fossa and Hand Flashcards Preview

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Flashcards in B7.018 Forearm, Cubital Fossa and Hand Deck (36):
1

2 compartments in the forearm

anterior (volar)
posterior (dorsal)
separated by the two bones and the interosseous membrane
each has its own deep fascia

2

anterior forearm compartment

anteromedial
muscles originate from the medial epicondyle and medial epicondyle ridge of humerus
innervated by median and ulnar nerves

3

posterior forearm compartment

posterolateral
muscles originate from the lateral epicondyle and lateral epicondyle ridge of the humerus
function as extensors and supinators
innervated by radial nerve

4

structure of forearm muscles

fleshy masses at proximal part of forearm
form tendons as they approach the distal forearm and tendons continue into the wrist, hand, and digits

5

what is the anterior interosseous nerve

branch of median nerve at distal cubital fossa

6

what does the anterior interosseous innervate

lateral FDP
flexor pollicis longus
pronator quadratus
(deep anterior forearm muscles)

7

forearm skin innervation

medial side = medial cutaneous
lateral side = musculocutaneous

8

hand skin innervation

anterior radial 3.5 fingers/palm = median
posterior radial 3.5 fingers = radial
anterior / posterior ulnar 1.5 finger/palm = ulnar

9

recurrent branch of median nerve

supplies 3 thenar muscles
comes out of the carpal tunnel woohoo

10

flexor retinaculum

transverse carpal ligament
dense CT band that bridges between trapezium and pisiform, plus hook of hamate
roof of carpal tunnel

11

palmar carpal ligament

superficial to flexor retinaculum
rook of Guyon's canal (ulnar nerve)

12

what structures make the canal of Guyon

pisiform and hook of the hamate

13

branches of the brachial artery

branches into ulnar (larger) and radial (smaller) at the head of the radius in the lower cubital fossa region

14

branches of the ulnar artery

-common interosseous artery
divides immediately into:
anterior interosseous artery
posterior interosseous artery
-muscular branches: muscles on medial forearm

15

superficial palmar arch

continuation of the ulnar artery that anastomoses with the radial artery

16

deep palmar arch

deep branch of ulnar artery that anastomoses with radial artery

17

significance of radial artery location

demarcation for the separation of the flexors and extensors of the forearm
runs across floor of anatomical snuff box (pulse)

18

US DR relationship

Superficial palmar arch is mainly Ulnar artery
Deep palmar arch is mainly Radial artery

19

borders of anatomical snuff box

top: extensor pollicis longus
bottom: extensor pollicis brevis

20

contents of anatomical snuff box

radial artery on floor
scaphoid, trapezium, and 1st CMC

21

deep branch of radial nerve

muscular and articular
injury: inability to extend thumb and MCPs

22

superficial branch of radial nerve

cutaneous and articular
supplies skin on dorsal side of hand and a number of joints in the hand

23

function of fibrous digital sheath

anchors flexor tendons to each phalanx with synovial sheath in between

24

annular

all the way around

25

cruciform

X shaped

26

how many digital arteries per finger

4

27

superficial branch of ulnar nerve

supplies medial one and a half digits on the anterior surface

28

deep branch of ulnar nerve

hypothenar muscles
medial 2 lumbricals
adductor pollicis
interossei muscles

29

dorsal branch of ulnar nerve

supplies medial half of dorsum hand, 5th digit, and medial half of 4th digit

30

radial nerve innervation of the hand

no intrinsic hand muscle innervation
innervates skin of lateral 2/3 of dorsum

31

ligaments of elbow joint

radial collateral
ulnar collateral

32

radial collateral ligament

from lateral epicondyle to annular ligament of the radius

33

ulnar collateral ligament

from medial epicondyle to coronoid process and olecranon of the ulna (3 bands):
1. anterior cordlike (strongest)
2. posterior fanlike (weakest)
3. oblique (deepens the socket for the trochlea)

34

bursa around elbow

subtendinous
intratendinous
subcutaneous

35

subcutaneous bursa

located in subcutaneous tissue over the olecranon

36

when are hand grips the strongest

when wrist is extended