Upper limb - Hand muscles (MSK) Flashcards
(15 cards)
Intrinsic muscles
Originate and terminate within the hand itself
Extrinsic muscles
Act on the and and the wrist but don’t originate from the hand
Thenar eminence
- Muscles
- Base of the thumb
- Includes: Abductor pollicis brevis, flexor pollicis brevis, opponens pollicis
Abductor pollicis brevis
Origin, insertion, innervation, action
- Flexor retinaculum
- Proximal phalanx of the thumb
- Median nerve
- Abducts the thumb
- Occurs In coronal plane
Flexor pollicis brevis
Origin, insertion, innervation, action
- Flexor retinaculum
- Proximal phalanx of the thumb
- Median nerve
- Flexor of the thumb
Opponens pollicis
Origin, insertion, innervation, action
- Flexor retinaculum
- Distal metacarpal of the thumb
- Median nerve
- Opposition of the thumb and pinky
Hypothenar eminence
- Muscles
Abductor digiti minimi, flexor digiti minimi, opponens digiti minimi
Abductor digiti minimi
Origin, insertion, innervation, action
- Flexor retinaculum
- Proximal phalanx of the pinky
- Ulnar nerve
- Abducts the pinky
Flexor digiti minimi
Origin, insertion, innervation, action
- Flexor retinaculum
- Proximal phalanx of the pinky
- Ulnar nerve
- Flexor of the pinky
Opponens digiti minimi
Origin, insertion, innervation, action
- Flexor retinaculum
- Distal metacarpal of 5th digit (pinky)
- Ulnar nerve
- Opposition of pinky and thumb
Palmar interossei
Origin, insertion, innervation, action
- Originate from metacarpals
- Proximal phalanx and extensor expansion hood
- Ulnar nerve
- Adduction of fingers
- 3 muscles total (3 for Pal)
Dorsal interossei
Origin, insertion, innervation, action
- metacarpals
- Proximal phalanx and extensor expansion hood
- Ulnar nerve
- Abduction of the digits
- 4 in total (4 for dors)
Adductor pollicis
Origin, insertion, innervation, action
- Metacarpal 3
- Proximal phalanx of the thumb
- Ulnar nerve
- Adduction
- triangular muscle
lumbricals
Origin, insertion, innervation, action
- Tendons of flexor digitorum profundus
- Extensor expansion hood
- Lateral 2 innervated by the median nerve and medial 2 are innervated by the ulnar nerve
- Flexion (metacarpal) and extension (interphalanegal joints)
- 4 total
HALF LOAF
- All muscles in the hand are innervated by the ulnar nerve except:
Half of the lumbricals (medial innervated by ulnar lateral by median)
opponens pollicis
abductor pollicis brevis
Flexor pollicis brevis
