Chapter 5: Muscles of the Wrist and Hand
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
