Muscles of the upper limb - Hand myology Flashcards
Deep: Dorsal interossei
O: By two heads, each from adjacent sides of metacarpals
I: Extensor hood and base of proximal phalanges of index, middle and ring fingers
N: Deep branch of ulnar nerve C8, T1
B: First dorsal metacarpal artery (radial artery)
A: Abduction of index, middle, and ring fingers at metacarpophalangeal joints
Deep: Palmer interossei
O: Side of metacarpals
I: Extensor hoods of the thumb, index, ring and little fingers and proximal phalanx of thumb
N: Deep branch of ulnar nerve C8, T1
B: Palmar metacarpal arteries, from the deep palmar arch, which is comprised of the terminal portion of the radial artery and the deep branch of the ulnar artery.
A: Adduction of the thumb, index, ring and little fingers at metacarpophalangeal joints
Deep: Adductor pollicis (two heads)
O: Transverse head: palmar surface of third metacarpal
Oblique head: Capitate and bases of second and third metacarpals
I: Base of proximal phalanx of thumb and extensor hood of thumb
N: Deep branch of ulnar nerve C8, T1
B: Deep palmar arterial arch
A: Adducts thumb
Deep: Lumbricals
O: Tendons of flexor digitorum profundus
I: Extensor hoods of indexx, ring, middle and little fingers
N: (first and second lumbricals): Digital branches of median nerve
(third and fourth): Deep branch of ulnar nerve
B: Dorsal carpal arch
A: Extend interphalangeal joints and simultaneously flex metacarpophalangeal joints
Thenar compartment: Opponens pollicis
O: Flexor retinaculum. Tubercle of trapezium
I: Entire length of radial border of first metacarpal
N: Recurrent branch of median nerve C8, T1
B: Superficial palmar branch that arises from the radial artery
A: Medially rotates thumb
Thenar compartment: Flexor pollicis brevis
O: Flexor retinaculum, Tubercle of trapezium.
I: Proximal phalanx of thumb
N: Recurent branch of median nerves C8, T1
B: Radial artery
A: Flexes thumb at metacarpophalangeal joint
Thenar compartment: Abductor pollicis brevis
O: Tubercles of trapezium and scaphoid and adjacent flexor retinaculum
I: Proximal phalanx and extensor hood of thumb
N: Recurrent branch of median nerve C8, T1
B: Superficial palmar branch that arises from the radial artery
A: Abducts thumb at metacarpophalangeal joint
Hypothenar compartment: Opponens digiti minimi
O: Hook of hamate. Flexor retinaculum
I: Entire length of medial (ulnar) border of fifth metacarpal
N: Deep branch of ulnar nerve C(7), 8, T1
B: Deep palmar branch of ulnar artery and the deep palmar arch
A: Laterally rotates fifth metacarpal (pinky moved towards the thumb)
Hypothenar compartment: Abductor digiti minimi
O: Pisiform, pisohamate ligament and tendon of flexor carpi ulnaris
I: Proximal phalanx of little finger
N: Deep branch of ulnar nerve C(7), 8, T1
B: Palmar branch of ulnar artery, palmar digital artery, as well as branches of the ulnar side of the superficial palmar arch
A: Abducts little finger at metacarpophalangeal joint
Hypothenar compartment: Flexor digiti minimi brevis
O: Hook of hamate. Flexor retinaculum
I: Proximal phalanx of little finger
N: Deep branch of ulnar nerve C(7), 8, T1
B: Deep palmar branch of ulnar artery
A: Flexes little finger at metacarpophalangeal joint
Ligaments of the wrist- radiocarpal joint: Radial collateral ligament
Styloid process of radius to scaphoid bone
Function: Strengthens articular capsule and provides stability to radiocarpal articulation
Ligaments of the wrist- radiocarpal joint: Ulna collateral ligament
Styloid process of ulna to triquetrum bone of hand distally
Function: Strengthens articular capsule of the wrist and stabilizes joint
Flexor retinaculum (forms the carpal tunnel) (palmer side)
Medially: Pisiform bone and hook of hamate to tubercle of scaphoid and crest of trapezium laterally
Function: To serve as a pulley for the carpal flexor muscles and to stabilize the carpal system
Extensor retinaculum (dorsal side)
Laterally: Lower part of the anterior border of the radius to syloid process of ulna, triquetral and pisiform medially
Function: Helps to keep the extensor tendons in alignment and prevent bowstringing during movements
Intercarpal ligaments: Interosseous Intercarpal ligaments
- Lunotriquetral
- Capitohamate
- Scapholunate
- Trapeziotrapzoidal
- Trapezoideocapitate
Function: provide stability to the intercarpal joints
