ANAT: Posterior forearm and Hand Flashcards Preview

My cards > ANAT: Posterior forearm and Hand > Flashcards

Flashcards in ANAT: Posterior forearm and Hand Deck (41):
1

Innervation of posterior forearm muscles

Radial n.

2

Superficial layer muscles

Brachioradialis, Extensor carpi radialis longus, Extensor carpi radialis brevis, Extensor digitorum, Extensor digiti minimi, Extensor carpi ulnaris, Anconeus

3

Deep layer muscles

Supinator, Abductor pollicis longus, Extensor pollicis brevis, Extensor pollicis brevis, Extensor indicis

4

Brachioradialis [O]

Lateral supracondylar ridge of the humerus

5

Brachioradialis [I]

Distal radius, near styloid process

6

Brachioradialis [A]

Flexes the forearm, partially supinates from fully pronated position

7

Extensor carpi radialis longus [O]

Lateral supracondylar ridge

8

Extensor carpi radialis longus [I]

Base of second metacarpal

9

Extensor carpi radialis longus [A]

Extends and abducts the hand, weakly flexes forearm

10

Extensor carpi radialis brevis [O]

Lateral epicondyle of humerus

11

Extensor carpi radialis brevis [I]

Base of third metacarpal

12

Extensor carpi radialis brevis [A]

Extends and abducts the hand; assists in forearm extension

13

Extensor digitorum [O]

Lateral epicondyle

14

Extensor digitorum [I]

Tendons to digits II, III, IV, and often (not always) V. Base of proximal phalanx, splits into central band to base of middle phalanx, and then then two side bands (collateral bands) to the distal phalanx

15

Extensor digitorum [A]

Extends MCP joint, PIP, and DIP joints. Assists in extending hand and forearm

16

Extensor digiti minimi [O]

Lateral epicondyle

17

Extensor digiti minimi [I]

Joins ED tendon of Digit V

18

Extensor digiti minimi [A]

Extension of MCP, PIP, and DIP joints of digit V, minorly assists in hand an forearm extension

19

Extensor carpi ulnaris [O]

Lateral epicondyle and posterior border of the Ulna

20

Extensor carpi ulnaris [I]

Base of the fifth metacarpal

21

Extensor carpi ulnaris [A]

Extends and adducts the hand; assists in extension of the forearm

22

Anconeus [O]

Posterior lateral epicondyle

23

Anconeus [I]

lateral side of the proximal Ulna; including Olecranon process

24

Anconeus [A]

Assists triceps in extending the forearm, stabalizes the elbow joint; abducts the ulna during pronation

25

Supinator [O]

Lateral epicondyle, radial collateral ligament of the elbow, and lateral side of the proximal Ulna

26

Supinator [I]

Spirals around proximal radius to insert on the posterior, lateral and anterior sides of radius

27

Supinator [A]

Supinates the forearm by swiveling radius, less powerful supinator than biceps brachii, unless fully extended.

28

Outcropping (interosseous) muscles

Abductor pollicis longus, Extensor pollicis brevis, Extensor pollicis longus, Extensor indicis

29

Outcropping (interosseous) muscles [O]

Posterior side of the interosseous membrane, and adjacent parts of the ulna and radius

30

Abductor pollicis longus [I]

Base of the metacarpal 1, laterally

31

Abductor pollicis longus [A]

Abducts and extends the 1st carpometacarpal joint and abducts the hand

32

Extensor pollicis brevis [I]

Base of the proximal phalanx of the thumb

33

Extensor pollicis brevis [A]

Extends CM and MCP joints of the thumb and abducts the hand

34

Extensor pollicis longus [I]

Base of the distal phalanx of the thumb

35

Extensor pollicis longus [A]

Extends the CM, MCP, and IP joint of the thumb. Assists in extending the hand

36

Extensor indicis [I]

Joins ED tendon to digit II

37

Extensor indicis [A]

Extends, MCP, PIP, and DIP joints of digit II. Slightly assists in extending the hand

38

Anatomical Snuffbox

Area between the Extensor pollicis longus tendon and the Extensor pollicis brevis tendon
*Clinical: fractured Scaphoid is tender here.

39

Lateral epicondylitis

(Elbow tendinitis) Due to excessive use of the superficial extensor muscles of the forearm.
- Inflammation of the periosteum of the lateral epicondyle and the origin of the superficial extensor mm.
*Pain conveyed by the superficial branch of the radial n. - radiates inferiorly down posterior forearm.

40

Mallet/ Baseball finger ("Jammed" finger)

Due to avulsion of the insertion of the extensor tendon on the distal phalanx; resulting from forceful flexion of the DIP during extension.
*Presentation: extension of all joints except the DIP which remains flexed.

41

Synovial cyst of the wrist

Cysts of mucinous fluid called "ganglion" non-tender swellings that appear on dorsal wrist -- communicates with synovial sheaths