PTA110 - Wrist Joint
Extensor Carpi Radialis Longus
O- Lateral Supracondylar ridge of humerus I- Base of second metacarpal A- Wrist extension, radial deviation N- Radial nerve (C6, C7)
Extensor Carpi Ulnaris
O- Lateral epicondyle of humerus I- Base of fifth metacarpal A- Wrist extension, ulnar deviation N- Radial nerve (C6, C7, C8)
Extensor Carpi Radialis Brevis
O- Lateral epicondyle of humerus I- Base of third metacarpal A- Wrist extension N- Radial nerve (C6, C7)
Palmaris Longus
O- Medial epicondyle of humerus I- Palmar fascia A- Assistive in wrist flexion N- Median nerve (C6, C7)
Flexor Carpi Ulnaris
O- Medial epicondyle of humerus I- Pisiform and base of fifth metacarpal A- Wrist flexion, ulnar deviation N- Ulnar nerve (C8, T1)
Flexor Carpi Radialis
O- Medial epicondyle of the humerus I- Base of second and third metacarpals A- Wrist flexion, radial deviation N- Median nerve (C6, C7)
Palmar Facscia / Palmar Aponeurosis
● Covers the tendons of the extrinsic muscles and provides some protection to the structures in the palm. ● The palmar fascia serves as the distal attachment of the palmaris longus
Radiocarpal Joint
● Distal end of the radius and the radioulnar disk proximally and the scaphoid, lunate, and triquetrum distally. ● The articular disk located between the ulna and the proximal row of carpals are part of this joint, thusly the ulna is not considered part of this joint. ●Bi-axial - Flex/Ext & Ulnar/Radial Dev ●Condyloid joint (concave on convex)
Midcarpal Joint
● Located between the two rows of carpal bones and contribute to wrist motion. ●Their shape is irregular, and they are classified as plane joints ●Non-axial joints that allow gliding motions
Review of Wrist Prime Movers
●*Flexion* ▪ Flexor carpi radialis ▪ Flexor carpi ulnaris ●*Extension* ▪ Extensor carpi radialis longus & brevis ▪ Extensor carpi ulnaris ●*Radial deviation* ▪ Flexor carpi radialis, ▪ Extensor carpi radialis longus ●*Ulnar deviation* ▪ Flexor carpi ulnaris ▪ Extensor carpi ulnaris
Review of Wrist Muscles by Innervation
●*Radial Nerve* ▪ Extensor carpi radialis longus & brevis ▪ Extensor carpi ulnaris ●*Median Nerve* ▪ Flexor carpi radialis ▪ Palmaris longus ●*Ulnar Nerve* ▪ Flexor carpi ulnaris
Remembering the Carpal Bones
●From lateral to medial in anatomical position *So Long To Pinky/Here Comes The Thumb*
Ligaments & Joint Support
●Radial Collateral ●Ulnar Collateral ●Palmar Radiocarpal ●Dorsal Radiocarpal
TFCC
●The Triangular fibrocartilage complex (TFCC) is formed by the articular disc between the ulna triquetrium & lunate, the radioulnar ligaments and the ulnocarpal ligaments.