Wrist Joint Chapter 12 Terms

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Flexor Carpi Radialis Insertion

Base of second and third metacarpals

Extensor Carpi Radialis Longus Insertion

Base of second metacarpal

Extensor Carpi Radialis Brevis Insertion

Base of third metacarpal

Wrist muscles in order from anterior medial side proceeding laterally around wrist

FCU, FCR, PL, ECRL,ECRB, ECU

Flexor Carpi Ulnaris Insertion

Pisiform and base of 5th Metacarpal

Radial collateral function

Provides lateral support

*Palmar Fascia Function

Provides protection and attachment

Radiocarpal Joint concave surface

Proximal Radius

Loss of radial nerve function results in wrist drop why?

Radial nerve innervates extensor muscles. When nerve is compromised, extension and supination are affected.

Extensor Carpi Radialis Longus Origin

Supracondyler ridge of humerus

radiocarpal joint convex surface

distal carpal

extensor carpi radialis brevis motion(s)

extension

Extensor Carpi Radialis Longus motion(s)

extension, radial deviation

extensor carpi ulnaris motion(s)

extension, ulnar deviation

muscles of wrist that attach on posterior side of wrist

extensor carpi radialis longus, extensor carpi radialis brevis, extensor carpi ulnaris

radial nerve innervation

extensor muscles of the wrist

*Articular disk function

filler between ulna and adjacent carpals

Palmaris longus motion(s)

flexion

flexor carpi radialis motion(s)

flexion

Flexor Carpi Ulnaris Motion(s)

flexion and radial deviation

Radiocarpal motion(s)

flexion, extension, ulnar deviation

Midcarpal Motion(s)

gliding

placing the plate on the counter

neutral wrist position

Extensor Carpi Ulnaris Insertion

base of fifth metacarpal

Radiocarpal Shape

biaxial joint

Wrist extension by extensor carpi radialis longus. Neutralizing muscle?

flexor carpi ulnaris

Wrist flexion by flexor carpi ulnaris. Neutralizing muscle?

flexor carpi ulnaris

muscles weakened by ulnar nerve entrapment

flexor carpi ulnaris

muscles that attach on the base of the fifth metacarpal

flexor carpi ulnaris, extensor carpi ulnaris

Radiocarpal Axis

frontal

Why doesn't extensor carpi radialis play a major role in wrist radial deviation?

inserts at midline of the third metacarpal

the plate is being lowered from the cabinet shelf to the counter

isometric muscle contraction

the plate is being raised from the counter to the cabinet shelf

isometric muscle contraction

Extensor Carpi Radialis Brevis Origin

lateral epicondyle of humerus

Extensor Carpi Ulnaris Origin

lateral epicondyle of humerus

Palmar radiocarpal ligament function

limits extension

Dorsal radiocarpal ligament function

limits flexion

Flexor Carpi Radialis Origin

medial epicondyle of humerus

Flexor Carpi Ulnaris Origin

medial epicondyle of humerus

Palmaris Longus Origin

medial epicondyle of humerus

wrist flexors share a common proximal attachment on or in the area of the

medial epicondyle of humerus

flexor carpi radialis nerve

median

palmaris longus nerve

median

wrist flexors nerve

median and ulnar

starting to remove the plate from the cabinet shelf

neutral wrist position

Midcarpal plane and axis

nonaxial

Nonbony attachment of palmaris longus

palmar fascia

Muscle that doesn't have two bony attachments

palmaris longus

Ulnar collateral ligament function

provides medial support

extensor carpi radialis brevis nerve

radial

extensor carpi radialis longus nerve

radial

extensor carpi ulnaris nerve

radial

wrist extensors nerve

radial

Palpate your partner's pulse at the anterior distal lateral aspect of the forearm, just proximal to the wrist. What artery are you palpating?

radial artery

Wrist extension by extensor carpi radialis longus. Need to neutralize what movement?

radial deviation

opening a jar with a screw on lid using your right hand movement

radial deviation

What structure limits radial deviation?

radius hitting into carpal bones

Radiocarpal Plane

sagittal

Exception: flexor carpi ulnaris nerve

ulnar

flexor carpi ulnaris nerve

ulnar

Wrist flexion by flexor carpi ulnaris. Need to neutralize what movement?

ulnar deviation

opening a jar with a screw-on lid using your left hand movement

ulnar deviation

replacing the lid on the jar using your right hand movement

ulnar deviation

can the position of the elbow joint affect the range of motion of the wrist?

yes

Midcarpal Shape

Irregular

Palmaris Longus Insertion

Palmar Fascia


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