Radiocarpal Joint and Inferior radioulnar joint Flashcards
What are the articualting surfaces of the radiocarpal Joint? describe how it articulates.
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)
What movements occur at the Radiocarpal joint
Flexion/Extension
Radial deviation/Ulnar deviation
What kind of joint is the RadioCarpal Joint
A synovial ellipsoid joint, It is Biaxial and can contribute to;
Flexion/Extension
Radial deviation/Ulnar deviation
What is the TFCC
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
Name the 8 carpal Bones
- Scaphoid
- Lunate
- Triquetrium
- Pisiform
- Trapezium
- Trapezoid
- Capitate
- Hamate
What are the ligaments involved in the support of the radiocarpal joint both intracapsular and extracapsular
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)
What are the end feels of Flexion, Extension, Ulnar deviation and radial deviation
Flexion - Firm
Extesnion - Firm
Radial dev - Hard
Ulnar dev - Firm
Describe the Caprpal Tunnel
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
What Kind of Joint is the Inferior radiocarpal Joint
Is a Uniaxial synovial pivot joint
What are the articualting surfaces of the Inferior radiocarpal joint
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.
What movement occur at the inferior radioulnar joint
Allows for supinationa dn pronation of the wrist
What are the short flexors of the wrist
Flexor carpi Ulnaris
Flexor carpi radialis
What are the long flexors of the wrist
Flexor digitorum superifcialis
Flexor digitorum profucndus
Flexor pollicis longus
What are the short extensors of the wrist ?
Extensor carpi radialis Longus
Extensor carpi radialis brevis
Extensor carpi Ulnaris
What are the Long flexors of the wrist
extensor digitorum
Extensor pollicis longus
Extensor pillicis brevis
Extensor indicis
What muscles contribute to Radial deviation
Combined action of the flexor and extensor carpi radialis (brevis and longus)
What msucles contribute to Ulnar deviation?
Combined flexor and extensor carpi ulnaris
What muscles contribute to Pronation
Pronator teres
Pronator Quadratus
What muscles contribute to Supination
Supinator
Biceps Brachii
Flexor carpi Ulnaris (B)
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
Flexor carpi Radialis
M - Fusiform anterior medial to lateral
O - Medial epi of huemrus
I - Base of metacarpals 2-3
A- Wrist flexion, Radial deviation
Flexor digitorum Superficialis
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
Flexor digitorum Profundus
M - Fusiform in anterior compartment of forearm
O - Proximal anterior Ulna
I - Palmar phalanges 2-5
A- Phalanges 2-5 flexion
Flexor pollicis Longus
Thumb flexion
