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8 small bones in 2 rows that articulate with the

distal radius, ulna and proximal metacarpals

Structure and Function of the Wrist

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The Wrist

Articulations: The radiocarpaljoint

The midcarpaljoint

Motions: Flexion & Extension

Radial & Ulnar Deviation

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The Wrist

Palmar = anterior aspect of the wrist and hand

Dorsal = posterior aspect of the wrist and hand

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Distal Ulna & Radius

Ulna

Radius

HeadStyloid Process

Styloid Processes

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Carpals

Left Hand Palmar Aspect(Anterior Aspect)

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The Wrist with the Carpals

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Carpal Tunnel Syndrome

The Transverse Carpal Ligament

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Arthrology of the Wrist

Radiocarpal Joint

Accepts approximately 80% of

the force that crosses the wrist

Concave radial surface & articulardisc

Convex carpals: scaphoid (7) & lunate(8)

Midcarpal

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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)

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Myology of the Wrist

Extensor Carpi Radialis Brevis

Origin Lateral epicondyle of the humerus-

common extensor tendon

Insertion Base of the 3rd metacarpal-dorsalaspect

Innervation Radial n.

Action Wrist extension, radial deviation

tidbit Whats in a name?

Common origin?

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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 Whats in a name?

Common origin?

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Myology of the Wrist

Extensor Carpi Ulnaris

Origin Lateral epicondyle of the humerus-common

extensor tendon andposterior border of the

middle 1/3 of the ulna

Insertion Base of the 5th metacarpal-dorsal surface

Innervation Radial n.

Action Wrist extension, ulnar deviation

tidbit Whats in a name?

Common origin?

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Myology of the Wrist

Flexor Carpi Radialis

Origin Medial epicondyle of the humerus-

common flexor tendon

Insertion Base of the 2nd metacarpal-palmaraspect

Innervation Median n.

Action Wrist flexion, radial deviation

tidbit Whats in a name?

Common origin?

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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 ulnaInsertion Base of the 5th metacarpal and

pisiform- palmar aspect

Innervation Ulnar n.

Action Wrist flexion, ulnar deviation

tidbit Whats in a name?

Common origin?

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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

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Identify!

Wrist extensors

Wrist flexors

Radial deviators

Ulnar deviators

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Identify!

Flexor Carpi Ulnaris

Palmaris Longus

Flexor Carpi Radials

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Identify!

Extensor carpi radialis brevis

Extensor carpi radials longus

Extensor carpi ulnaris

Flexor carpi ulnaris

Extensor retinaculum