Chapter 5: Muscles of the Wrist and Hand

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Intrinsic muscles of the hand: thenar eminence

1. Abductor pollicis brevis 2. Opponens pollicis 3. Flexor pollicis brevis 4. Adductor pollicis

Extrinsic muscles of the wrist and hand

1. Anterior 2. Posterior

Posterior muscles of the wrist and hand

1. Extensor carpi radialis brevis 2. Extensor carpi radialis longus 3. Extensor carpi ulnaris 4. Extensor digitorum (communis) 5. Extensor digiti minimi 6. Extensor indicis

Anterior muscles of the wrist and hand

1. Flexor carpi radialis 2. Flexor carpi ulnaris 3. Flexor digitorum superficialis 4. Palmaris longus 5. Flexor digitorum profundus

Flexor digitorum profundus: nerve

1. Median 2. Ulna

Intrinsic muscles of the hand: hypothenar eminence

1. Opponens digiti minimi 2. Abductor digiti minimi 3. Flexor digiti minimi brevis

Extensor digitorum (communis): action

1. Wrist extension 2. Distal interphalangeal extension 3. Proximal interphalangeal extension

Extensor digiti minimi: action

1. Wrist extension 2. Extends the 5th finger at the metacarpophalangeal (MPC) joint

Extensor indicis: action

1. Wrist extension 2. Extension of the 2nd finger at the metacarpophalangeal (MPC) joint

Extensor carpi radialis brevis: action

1. Wrist extension 2. Radial deviation

Extensor carpi radialis longus: action

1. Wrist extension 2. Radial deviation

Extensor carpi ulnaris: action

1. Wrist extension 2. Ulnar deviation

Flexor digitorum profundus: action

1. Wrist flexion 2. Distal interphalangeal flexion 3. Proximal interphalangeal flexion

Flexor digitorum superficialis: action

1. Wrist flexion 2. Proximal interphalangeal flexion (PIP)

Flexor carpi radialis: actions

1. Wrist flexion 2. Radial deviation

Flexor carpi ulnaris: action

1. Wrist flexion 2. Ulna deviation

Extensor carpi radialis longus: insertion

2nd metacarpal

Extensor carpi radialis brevis: insertion

3rd metacarpal

Extensor carpi ulnaris: insertion

5th Metacarpal

Extensor digiti minimi: insertion

5th Phalanx

Flexor carpi ulnaris: insertion

5th metacarpal

Flexor carpi radialis: location

Anterior lateral forearm - Radius is lateral

Flexor carpi ulnaris: location

Anterior medial forearm - Ulna is medial

Thenar eminence

Fleshy mound on the palm at the base of the thumb - "Pollicis"

Flexor digitorum superficialis vs flexor digitorum profundus

Flexor digitorum profundus - Contributes to both distal interphalangeal (DIP) and proximal interphalangeal (PIP) flexion Flexor digitorum superficialis - Only contributes to proximal interphalangeal (PIP) flexion

Extensor carpi radialis longus: origin

Humerus

Extensor carpi radialis brevis: origin

Lateral epicondyle of humerus - Common extensor tendon

Extensor carpi ulnaris: origin

Lateral epicondyle of humerus - Common extensor tendon

Extensor digiti minimi: origin

Lateral epicondyle of humerus - Common extensor tendon

Extensor digitorum (communis): origin

Lateral epicondyle of the humerus - Common extensor tendon

Flexor digitorum superficialis: origin

Medial epicondyle of humerus

Flexor carpi radialis: origin

Medial epicondyle of humerus - Common flexor tendon

Flexor carpi ulnaris: origin

Medial epicondyle of humerus - Common flexor tendon

Palmaris longus: origin

Medial epicondyle of humerus - Common flexor tendon

Flexor carpi radialis: nerve

Median

Flexor carpi radialis: insertion

Metacarpals

Flexor digitorum superficialis: insertion

Middle phalanges of digits 2-5

Palmaris longus: insertion

Palmaris aponeurosis

5-10% of the population lack the _________________________________ muscle.

Palmaris longus

Flexor digitorum profundus: insertion

Phalanges

Extensor digitorum (communis): insertion

Phalanges 2-5

Extensor indicis: insertion

Phalanx of index (2nd) finger

Extensor carpi radialis brevis: location

Posterior lateral forearm - Radius is lateral

Extensor carpi radialis longus: location

Posterior lateral forearm - Radius is lateral

Extensor carpi ulnaris: location

Posterior medial forearm - Ulna is medial

Extensor carpi radialis brevis: nerve

Radial

Extensor carpi radialis longus: nerve

Radial

Extensor carpi ulnaris: nerve

Radial

Extensor digiti minimi: nerve

Radial

Extensor digitorum (communis): nerve

Radial

Extensor indicis: nerve

Radial

Hypothenar eminence

The fleshy mass at the base of the little finger - "Digiti minimi"

Extensor indicis: origin

Ulna

Flexor carpi ulnaris: nerve

Ulna

Flexor digitorum profundus: origin

Ulna

Flexor digitorum superficialis: nerve

Ulna

Palmaris longus: nerve

Ulna

The common action of the posterior muscles of the wrist is ______________________.

Wrist Extension - Originate from the lateral epicondyle of the humerus

The common action of the anterior muscles of the wrist is ______________________.

Wrist Flexion - Originate from the medial epicondyle of the humerus

Palmaris longus: action

Wrist flexion


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