Radiocarpal Joint and Inferior radioulnar joint

Question 1

What are the articualting surfaces of the radiocarpal Joint? describe how it articulates.

Answer 1

Between the Proximal carpal bones.
- Scaphoid, Lunate and triquetrium
And the distal radius.

The large concave facet of the distal radius allows for the ariuclation between the radius with the scpahoid and lunate.

The articulation between the radius and the triquetrium is mediated by the Triangular fibrocartilidge complex (Its indirect)

Question 2

What movements occur at the Radiocarpal joint

Answer 2

Flexion/Extension
Radial deviation/Ulnar deviation

Question 3

What kind of joint is the RadioCarpal Joint

Answer 3

A synovial ellipsoid joint, It is Biaxial and can contribute to;
Flexion/Extension
Radial deviation/Ulnar deviation

Question 4

What is the TFCC

Answer 4

Triangular fibrocartilaginous complex
- It acts like a meniscus, seperates the Ulnar styloid process from the triquetrum. Increases the surface area of the joint. It Mediates the articualtion between the radius and the triquetrium

Question 5

Name the 8 carpal Bones

Answer 5

• Scaphoid
• Lunate
• Triquetrium
• Pisiform
• Trapezium
• Trapezoid
• Capitate
• Hamate

Question 6

What are the ligaments involved in the support of the radiocarpal joint both intracapsular and extracapsular

Answer 6

Intra
- Dorsal radiocarpal Ligament (taut in flexion
- Palmar radiocarpal Ligament (taut in extension)
Extra
- Radial collateral Ligament (taut in adduction
- Ulnar Collateral ligament (taut in abduction)

Question 7

What are the end feels of Flexion, Extension, Ulnar deviation and radial deviation

Answer 7

Flexion - Firm
Extesnion - Firm
Radial dev - Hard
Ulnar dev - Firm

Question 8

Describe the Caprpal Tunnel

Answer 8

A structure in the anterior wrist formed by the carpal bones. A passage allowing the veins, arteries and nerves supplying the hand to move through. Carpal Tunnel syndrome is the compression of the median nerve.
Covered by tendon sheaths and the transverse Carpal Ligament

Question 9

What Kind of Joint is the Inferior radiocarpal Joint

Answer 9

Is a Uniaxial synovial pivot joint

Question 10

What are the articualting surfaces of the Inferior radiocarpal joint

Answer 10

The articualtion between the lateral aspect of the distal end of the ulnar with the concave notch on the medial aspect of the distal end of the radius. This joint is supported by the triangular fibrocartilaginous complex.

Question 11

What movement occur at the inferior radioulnar joint

Answer 11

Allows for supinationa dn pronation of the wrist

Question 12

What are the short flexors of the wrist

Answer 12

Flexor carpi Ulnaris
Flexor carpi radialis

Question 13

What are the long flexors of the wrist

Answer 13

Flexor digitorum superifcialis
Flexor digitorum profucndus
Flexor pollicis longus

Question 14

What are the short extensors of the wrist ?

Answer 14

Extensor carpi radialis Longus
Extensor carpi radialis brevis
Extensor carpi Ulnaris

Question 15

What are the Long flexors of the wrist

Answer 15

extensor digitorum
Extensor pollicis longus
Extensor pillicis brevis
Extensor indicis

Question 16

What muscles contribute to Radial deviation

Answer 16

Combined action of the flexor and extensor carpi radialis (brevis and longus)

Question 17

What msucles contribute to Ulnar deviation?

Answer 17

Combined flexor and extensor carpi ulnaris

Question 18

What muscles contribute to Pronation

Answer 18

Pronator teres
Pronator Quadratus

Question 19

What muscles contribute to Supination

Answer 19

Supinator
Biceps Brachii

Question 20

Flexor carpi Ulnaris (B)

Answer 20

M - fusiform in the anterior medial compartment of forearm
O - Medial epicondyle of humerus
I - Pisiform, hamate, base of 5th metacarpal
A - Wrist flexion and ulnar deviation

Question 21

Flexor carpi Radialis

Answer 21

M - Fusiform anterior medial to lateral
O - Medial epi of huemrus
I - Base of metacarpals 2-3
A- Wrist flexion, Radial deviation

Question 22

Flexor digitorum Superficialis

Answer 22

M - Two headed superficial flexor which divides into 4 tendons
O - Medial Epi of humerus and anterior radius
I - Middle phalanges of 2-5
A - Flexion of phalanges 2-5

Question 23

Flexor digitorum Profundus

Answer 23

M - Fusiform in anterior compartment of forearm
O - Proximal anterior Ulna
I - Palmar phalanges 2-5
A- Phalanges 2-5 flexion

Question 24

Flexor pollicis Longus

Answer 24

Thumb flexion

Question 25

What are the short extensors of the wrist

Answer 25

Extensor carpi radialis longus
Extensor carpi radialis brevis

Question 26

What are the long extensors of the wrist?

Answer 26

Extensor digitorum
Extensor Pollicis Longus
Extensor pollicis brevis
Extensor indices

Question 27

Extensor carpi radialis longus (B)

Answer 27

M - Extensor muscle in the posteriior compartment of forearm
O - Lateral surface of humerus and some lateral epi
I - Posterior aspect of 2nd metacarpal bone
A - Hand extension and radial deviation

Question 28

Extensor carpi radialis brevis (B)

Answer 28

M - Fusiform, lateral posterior forearm
O - Lateral epi of humerus (common extensor tendon)
I - Posterior base of metacapral 3
A - Hand extesnion, radial deviation

Question 29

Extensor digitorum (C)

Answer 29

M - long muslce located iin the posterior compartment of the forearm. Finger extsnion of 2-5

Question 30

Extensor pollicis longus (C)

Answer 30

Deep extensor
Extends the thumb and some weak wrist extension

Question 31

Extensor Pollicis brevis (C)

Answer 31

Deep extensor
Thumb extension

Question 32

Extensor Indicis (C)

Answer 32

narrow muscle posterior compartment
Deep extensor. middle finger extension

Question 33

Where and what is the common extensor tendon?

Answer 33

A fibrous band of connective tissue that attaches to the, lateral epicondyle of the humerus.
It is the proximal attachment of extensor carpi radilais brevis and ulnaris and extensor digitourum superifcialis and extensor digiti minimi

Question 34

Where and what is the common flexor tendon?

Answer 34

The common flexor tendpon originates from the medial epicondyle of the humerus.
It is the common attachment site for six long flexor muscles of the forearm.