Wrist

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Wrist Hand Muscles
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(No Transcript)
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Wrist Hand Bones

• Radius
• Ulna
• Navicular
• Lunate
• Triangular
• Pisiform
• Trapezium
• Trapezoid
• Capitate
• Hamate
• Metacarpal (1st 5th)
• Phalanges

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Wrist Flexion Muscles

• Flexor Carpi Radialis
• Flexor Carpi Ulnaris
• Palmaris Longus

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Flexor Carpi Radialis

• Origin
• Medial epicondyle of humerus
• Insertion
• Base of 2nd 3rd metacarpals, anterior (palmar
  surface)

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Flexor Carpi Radialis

• Action
• Flexion of wrist
• Abduction of wrist
• Weak flexion of elbow
• Innervation
• Median nerve (C6,7)

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Flexor Carpi Ulnaris

• Origin
• Medial epicondyle of humerus
• Posterior aspect of the proximal ulna
• Insertion
• Pisiform, hamate, base of 5th metacarpal

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Flexor Carpi Ulnaris

• Action
• Flexion of wrist
• Adduction of wrist
• Weak flexion of elbow
• Innervation
• Ulnar nerve (C8, T1)

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Palmaris Longus

• Origin
• Medial epicondyle of humerus
• Insertion
• Palmar aponeurosis of the 2nd, 3rd, 4th, 5th
  metacarpals

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Palmaris Longus

• Action
• Flexion of wrist
• Weak flexion of elbow
• Innervation
• Median nerve (C6,7)

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Wrist Extension Muscles

• Extensor Carpi Ulnaris
• Extensor Carpi Radialis Brevis
• Extensor Carpi Radialis Longus

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Extensor Carpi Ulnaris

• Origin
• Lateral epicondyle of humerus
• Insertion
• Base of 5th metacarpal (dorsal side)

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Extensor Carpi Ulnaris

• Action
• Extension of wrist
• Adduction of wrist
• Weak extension of elbow
• Innervation
• Radial nerve (C6,7,8)

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Extensor Carpi Radialis Brevis

• Origin
• Lateral epicondyle of humerus
• Insertion
• Base of 3rd metacarpal (dorsal surface)

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Extensor Carpi Radialis Brevis

• Action
• Extension of wrist
• Abduction of wrist
• Weak extension of elbow
• Innervation
• Radial nerve (C6,7)

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Extensor Carpi Radialis Longus

• Origin
• Lower 1/3 of lateral supracondylar ridge of
  humerus
• Lateral epicondyle of humerus
• Insertion
• Base of 2nd metacarpal (dorsal surface)

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Extensor Carpi Radialis Longus

• Action
• Extension of wrist
• Abduction of wrist
• Weak extension of elbow
• Innervation
• Radial Nerve (C6,7)

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Finger Muscles

• Flexor Digitorum Superficialis
• Flexor Digitorum Profundus
• Extensor Digitorum
• Extensor Indicis

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Flexor Digitorum Superficialis

• Origin
• Medial epicondyle of humerus
• Ulna Head medial coronoid process
• Radial Head upper 2/3 of anterior border of
  radius

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Flexor Digitorum Superficialis

• Insertion
• Each tendon splits attaches to the sides of the
  middle phlanax of 4 fingers (palmar surface)

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Flexor Digitorum Superficialis

• Action
• Flexion of fingers
• Flexion of wrist
• Weak flexion of elbow
• Innervation
• Median nerve
• (C7,8, T1)

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Flexor Digitorum Profundus

• Origin
• Proximal ¾ of anterior medial ulna
• Insertion
• Base of distal phalanxes of the 4 fingers

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Flexor Digitorum Profundus

• Action
• Flexion of fingers
• Flexion of wrists
• Innervation
• Median nerve (C8, T1) to 2nd 3rd fingers
• Ulna nerve (C8, T1) to 4th 5th fingers

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Extensor Digitorum

• Origin
• Lateral epicondyle of humerus
• Insertion
• 4 tendons to bases of middle distal phalanges
  of the 4 fingers

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Extensor Digitorum

• Action
• Extension of 2nd, 3rd, 4th, 5th phalanges
• Extension of wrist
• Weak extension of wrist
• Innervation
• Radial nerve (C6,7,8)

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Extensor Indicis

• Origin
• Middle to distal 1/3 of posterior ulna
• Insertion
• Base of middle distal phalanxes (dorsal surface)

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Extensor Indicis

• Action
• Extension of index finger
• Weak wrist extension
• Innervation
• Radial nerve (C6,7,8)

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Extensor Digiti Minimi

• Origin
• Lateral epicondyle of humerus
• Insertion
• Base of middle distal phalanxes of 5th phalange
  (dorsal surface)

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Extensor Digiti Minimi

• Action
• Extension of little finger
• Weak wrist extension
• Innervation
• Radial nerve (C6,7,8)

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Thumb Muscles

• Flexor Pollicis Longus
• Extensor Pollicis Longus
• Extensor Pollicis Brevis
• Abductor Pollicis Longus

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Flexor Pollicis Longus

• Origin
• Middle anterior surface of radius
• Anterior medial border of ulna (just distal to
  coronoid process)
• Insertion
• Base of distal phalanx of thumb (palmar surface)

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Flexor Pollicis Longus

• Action
• Flexion of thumb
• Flexion of wrist
• Innervation
• Median nerve (C8, T1)

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Extensor Pollicis Longus

• Origin
• Posterior lateral surface of lower middle ulna
• Insertion
• Base of distal phalanx of thumb (dorsal surface)

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Extensor Pollicis Longus

• Action
• Extension of thumb
• Extension of wrist
• Innervation
• Radial nerve (C6,7,8)

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Extensor Pollicis Brevis

• Origin
• Posterior surface of lower middle radius
• Insertion
• Base of proximal phalanx of thumb (dorsal surface)

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Extensor Pollicis Brevis

• Action
• Extension of thumb
• Weak extension of wrist
• Innervation
• Radial nerve (C6,7)

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Abductor Pollicis Longus

• Origin
• Posterior aspect of radius
• Midshaft of ulna
• Insertion
• Base of 1st metacarpal (dorsal surface)

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Abductor Pollicis Longus

• Action
• Abduction of thumb
• Abduction of wrist
• Innervation
• Radial nerve (C6, 7)