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Muscles of back/upper extremity > Hand > Flashcards

Flashcards in Hand Deck (21):
1

Number of bones in hand

27
8 carpals
5 metacarpals
14 phalanges

2

Radiocarpal joint type

condyloid synovial
permits movement in 2 directions (flexion/extension, abduction/adduction, circumduction)

3

Intercarpal (IC) joint type

gliding synovial

4

Carpometacarpal (CMC) joint type

planar synovial
saddle for 1st CMC - higher mobility

5

Metacarpophalangeal (MCP) joint type

condyloid synovial
pure hinge at 1st MCP

6

Interphalangeal (IP) joint type

hinge synovial
2 on digits 2-5 (PIPs, DIPs)
1 on digit 1

7

Intrinsic muscles of hand (by compartment)

palmaris brevis
thenar compartment
adductor compartment
hypothenar compartment
central compartment
interosseous compartments

8

Attachments of palmaris brevis

continuation of palmar aponeurosis
Distal: skin of medial border of hand

9

Thenar compartment muscles

abductor pollicis brevis
flexor pollicis brevis
opponens pollicis

10

Hypothenar compartment muscles

abductor digiti minimi
flexor digiti minimi
opponens digiti minimi

11

Adductor compartment muscle

adductor pollicis

12

Central compartment muscles

lumbricals

13

Interosseous compartments

dorsal interossei (DAB), 4
palmar interossei (PAD), 3

14

Innervation of thenar compartment muscles

recurrent branch of median nerve

15

Muscles in hand supplied by median nerve

1/2 LOAF
1/2 lumbricals
opponens pollicis
abductor pollicis brevis
flexor pollicis brevis
OAF of LOAF = thenar eminence

16

Innervation of hypothenar compartment muscles

deep branch of ulnar nerve

17

Function of lumbricals

flex MCP joints, extend IP joints

18

Innervation of lumbricals

lumbricals 1,2 - median nerve
lumbricals 3,4 - ulnar nerve

19

Innervation of interossei muscles

deep branch of ulnar nerve

20

Function of interossei

dorsal - abduct
palmar - adduct
assist lumbricals in flexion at MCPs, extension at IPs

21

Innervation of palmaris brevis

superficial branch of ulnar n.