Structure and Function of the Wrist 8 small bones in 2 rows that - PowerPoint PPT Presentation

Structure and Function of the Wrist 8 small bones in 2 rows that articulate with the distal radius, ulna and proximal metacarpals

The Wrist  Articulations:  The radiocarpal joint  The midcarpal joint  Motions:  Flexion & Extension  Radial & Ulnar Deviation

The Wrist  Palmar = anterior aspect of the wrist and hand  Dorsal = posterior aspect of the wrist and hand

Distal Ulna & Radius Head Styloid Processes Styloid Process Radius Ulna

Carpals Left Hand Palmar Aspect (Anterior Aspect)

The Wrist with the Carpals

Carpal Tunnel Syndrome  The Transverse Carpal Ligament

Arthrology of the Wrist  Radiocarpal Joint  Accepts approximately 80% of the force that crosses the wrist  Concave radial surface & articular disc  Convex carpals: scaphoid (7) & lunate (8)  Midcarpal

Intrinsic versus Extrinsic to the Wrist  Intrinsic-  Originating within the area and inserting in the area  Extrinsic-  Originating outside of the area but inserting in the area Triangular fibrocartilage (TFC) Lunotriquetral Ligament (L T Lig) Scaphoid Lunate (S L Lig)

Myology of the Wrist Extensor Carpi Radialis Brevis Origin Lateral epicondyle of the humerus- common extensor tendon Base of the 3 rd metacarpal-dorsal Insertion aspect Innervation Radial n. Action Wrist extension, radial deviation “tidbit” What’s in a name? Common origin?

Myology of the Wrist Extensor Carpi Radialis Longus Origin Lateral epicondyle of the humerus, common extensor tendon Insertion Base of the second metacarpal- dorsal aspect Innervation Radial n. Action Wrist extension, radial deviation “tidbit” What’s in a name? Common origin?

Myology of the Wrist Extensor Carpi Ulnaris Origin Lateral epicondyle of the humerus-common extensor tendon and posterior border of the middle 1/3 of the ulna Base of the 5 th metacarpal-dorsal surface Insertion Innervation Radial n. Action Wrist extension, ulnar deviation “tidbit” What’s in a name? Common origin?

Myology of the Wrist Flexor Carpi Radialis Origin Medial epicondyle of the humerus- common flexor tendon Base of the 2 nd metacarpal-palmar Insertion aspect Innervation Median n. Action Wrist flexion, radial deviation “tidbit” What’s in a name? Common origin?

Myology of the Wrist Flexor Carpi Ulnaris Origin Medial epicondyle of the humerus- common flexor tendon and posterior border of the middle 1/3 of the ulna Base of the 5 th metacarpal and Insertion pisiform- palmar aspect Innervation Ulnar n. Action Wrist flexion, ulnar deviation “tidbit” What’s in a name? Common origin?

Myology of the Wrist Palmaris Longus Origin Medial epicondyle of the humerus- common flexor tendon Insertion Transverse carpal ligament and the palmar fascia Innervation Median n. Action Wrist flexion “tidbit” Approximately 10% of the population will NOT have this muscle

Identify!  Wrist extensors  Wrist flexors  Radial deviators  Ulnar deviators

Identify!  Flexor Carpi Ulnaris  Palmaris Longus  Flexor Carpi Radials

Identify!  Extensor carpi radialis brevis  Extensor carpi radials longus  Extensor carpi ulnaris  Flexor carpi ulnaris  Extensor retinaculum