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8/3/2019 Kinesiology Wrist
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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