Upper limb 4 Flashcards
Superficial Posterior Muscles of the Forearm
Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Extensor carpi ulnaris Brachioradialis
Deep Posterior Muscles of the Forearm
Supinator Abductor pollicis longus Extensor pollicis longus Extensor indicis Extensor pollicis brevis
Extensor digiti minimi
belly of extensor digitorum
Extensor Carpi Radialis Longus
O: Lateral supracondyle ridge of humerus
I: base of 2nd metacarpal
A: Extend + Abduct hand
I: Radial nerve
Extensor Carpi Radials Brevis
O: Lateral epicondyle of humerus
I: base of 3rd metacarpal
A: Extend + Abduct hand
I: radial nerve (C7,C8)
Extensor Digitorum
O: Lateral epicondyle of humerus
I: Extensor expansions of digits
A: Extend wrist and fingers (at metacarpophalangeal joint)
I:Radial nerve(C7,C8)
Extensor Carpi Ulnaris
O: Lateral epicondyle of humerus + ulna
I: base of 5th metacarpal
A: Extend + Abduct hand
I: Radial nerve
Brachioradialis
O: lateral supracondylar ridge of humerus
I: lateral surface of radius
A: Flexes forearm
I: Radial nerve
Muscles that receive input directly from radial nerve
Brachioradialis
Tricep brachii
Extensor Carpi Radialis Longus
Anconeus
Extension Expansions
Aponeurosis formed from the tendons of extensory digitorum
Extensor Retinaculum
Similar to Flexor Retinaculum
Supinator
O: Lateral epicondyle of humerus + supinator fossa + crest of ulna
I: Lateral/ posterior/ anterior surface of radius
A: Supinate forearm
I: Radial nerve
Abductor Pollicis Longus
O: Ulna, Radius, Interosseous membrane
I: Base of 1st metacarpal
A: Abduct + Extend thumb
I: Radial Nerve (posterior interosseous nerve)
Extensor Indicis
O: posterior surface of ulna
I: Extensor expansion of 2nd digit
A: Extend index finger + help extend hand
I: Radial Nerve (posterior interosseous nerve)
Extensor Pollicis Longus
O: Posterior surface of ulna
I: distal phalanx of thumb
A: Extend distal phalanx of thumb
I: Posterior interosseous nerve
Extensor Pollicis Brevis
O: posterior surface of radius
I: Base of Proximal phalanx of thumb
A: Extend proximal phalanx of thumb
I: Posterior interosseous nerve.
Anatomical Snuffbox
Formed by tendons of Extensor Pollicis Longus and Brevis
Extrinsic muscles of the hand
Flexor Pollicis Longus
Abductor pollicis Longus
Extensor Pollicis Longus
Extensor Pollicis Brevis
Intrinsic muscles of the hand (Thenar)
Flexor Pollicis Brevis
Abductor Pollicis Brevis
Opponens Pollicis
Adductor Pollicis
Groups of Intrinsic Muscles
Thenar (4) Hypothenar (3) Palmar interosseous - 4 lumbricals - 3 palmar - 4 dorsal
Abductor Pollicis Brevis
O: Flexor Retinaculum
I: Lateral side of proximal phalanx of thumb
A: Abduct thumb + help oppose
I: Median Nerve
Flexor Pollicis Brevis
O: Flexor Retinaculum
I: Lateral side of proximal phalanx of thumb
A: Flexes Thumb
I: Median Nerve
Opponens Pollicis
O: Flexor Retinaculum
I: Lateral side of 1st metacarpal
A: Opposition
I: Median Nerve
Adductor Pollicis
O: Oblique head: base of 2nd and 3rd metacarpals
Transverse head: anterior surface of 3rd metacarpal
I: medial side of proximal phalanx of thumb
A: Adduction
I; Ulnar Nerve
Hypothenar muscles
Abductor digiti minimi
Opponens digiti minimi
Flexor digiti minimi
Palmaris digiti minimi
Abductor digiti minimi
O: pisiform
I: Proximal phalanx of pinky
A: Abduct pinky
I: Ulnar nerve
Opponens digiti minimi
O: hook of hamate + flexor retinaculum
I: 5th metacarpal
A: Opposition
I: Ulnar nerve
Flexor digiti minimi brevis
O: hook of hamate + flexor retinaculum
I: Proximal phalanx of pinky
A: flexes proximal phlanx of pinky
I: ulnar nerve
Palmar muscles major groups
lumbricals
interosseous
Palmar interossei
3 muscles Superficial Adducts fingers none attached to middle finger Uni-pennate
Dorsal interossei
4 msucles Deep Abduct fingers 2 attached to middle fingers Bi-pennate
Lumbricals
Worm-like muscles
allow flexion at metacarpophalangeal joints while maintaining extension at interphalangeal joints
Don’t directly attache to bone
Attach to tendons of flexor digitorum profundus and extensor expansions
Innervation of intrinsic muscles
Median nerve - 2 lateral lumbricals - 3 most lateral thenars Ulnar nerve - 2 medial lumbricals - all other intrinsic muscles
