Myology Flashcards
(shoulder girdle)
Rotator cuff compartment muscles
“SITS”
- supraspinus
- infraspinus
- teres minor
- subscapularis
Nerves:
- supraspinus
- infraspinus
- teres minor
- subscapularis
- suprascapular
- suprascapular
- AXILLARY
- subscapular
Action:
- supraspinus
- infraspinus
- teres minor
- subscapularis
- abduction
- externals (lateral) rotation
- external (lateral) rotation
- internal (medial) rotation
Origin/insertion
- supraspinus
- infraspinus
- teres minor
- subscapularis
- fossa of scapula/greater tubercle of humerus
- fossa of scapular/greater tubercle of humerus
- lat border dorsal scapula/greater tubercle of humerus
- subscapular fossa of scapula/lesser tubercle of humerus
(shoulder girdle)
Other compartment
Majority blood supply: descending scapular
- latissimus dorsi
- trapezius
- rhomboid
- SERRATUS ANTERIOR
- deltoid
- teres major
- pectoralis minor
Nerves:
- latissimus dorsi
- trapezius
- rhomboid
- SERRATUS ANTERIOR
- deltoid
- teres major
- pectoralis minor
- thoracodorsal
- spinal accessory
- dorsal scapular
- long thoracic
- axillary
- subscapular
- medial pectoral nerve
Action:
- latissimus dorsi
- trapezius
- rhomboid
- SERRATUS ANTERIOR
- deltoid
- teres major
- pectoralis minor
- extension + int. rot. arm
- aDduct scapula
- scapular retraction
- adheres scap to chest wall
- aBduction of arm
- ext. med. rot, aDduct arm
- Draws scapular forward
Origin/insertion:
- rhomboid
- deltoid
- SP of C7+T1 (minor) & SP of T2-T5 (major)/scapula
5. Trapezius, clavicle, acromion, spine of scapila/deltoid tuberosity of humerus
(arm)
Anterior compartment muscles
- biceps brachii
- brachialis
- brachioradialis
- coracobrachialis
- pronator teres
Nerve:
- biceps brachii
- brachialis
- brachioradialis
- coracobrachialis
- pronator teres
1,2,4: musculocutaneous
- radial
- MEDIAN
Blood supply:
- biceps brachii
- brachialis
- brachioradialis
- coracobrachialis
- pronator teres
1-4: brachial
5. ulnar
Action:
- biceps brachii
- brachialis
- brachioradialis
- coracobrachialis
- pronator teres
- flex elbow + supinate forearm
2+3. flex elbow - flexes + aDduct arm
- Pronate forearm
Origin/insertion:
- biceps brachii
- brachialis
- brachioradialis
- coracobrachialis
- pronator teres
- SHORT head: corocoid process, LONG head: supraglenoid tubercle of scapula, in capsule/radial tuberosity
- humerus/tuberosity + corocoid process of ulna
- humeral + ulnar head/radius
(arm)
Posterior compartment muscles
- triceps
2. anconeus
Nerve:
- triceps
- anconeus
radial
Blood supply:
- triceps
- anconeus
brachial
Action:
- triceps
- anconeus
extension of arm
Origin/insertion:
- triceps
- anconeus
insertion: olecranon process of the ulna
(forearm)
Anterior compartment muscles
- biceps brachii
- flexor radialis
- flexor carpi ulnaris
- flexor dig. profoundus
- pronator teres
- flexor pollicus longus
- palmaris longus
Nerves:
- biceps brachii
- flexor radialis
- flexor carpi ulnaris
- flexor dig. profoundus
- pronator teres
- flexor pollicus longus
- palmaris longus
- musculocutaneous
2, 5, 6, 7. MEDIAN - ulnar
- 1/2 median + 1/2 ulnar
Action:
- biceps brachii
- flexor radialis
- flexor carpi ulnaris
- flexor dig. profoundus
- pronator teres
- flexor pollicus longus
- palmaris longus
- flexes elbow + supinate forearm
- flex + aBduct wrist
- flex + aDduct wrist
- flex DIP, PIP, MCP
- pronate forearm + flex elbow
- flex distal thumb
- wrist flexor
Origin/insertion:
- biceps brachii
- flexor radialis
- flexor carpi ulnaris
- flexor dig. profoundus
- pronator teres
- flexor pollicus longus
- palmaris longus
- insertion: radius tuberosity
2, 3. Origin: medial epicondyle of humerus - “2 heads”: humeral head attaches medial epicondyle, other head attaches to ulna
- insertion: palmar surface distal 2-5 phalanges
- Origin: medial epicondyle of humerus, coronoid of ulna
- medial epicondyle of humerus/palmar aponeurosis
(forearm)
Posterior compartment
- extensor carpi radialis longus
- brevis
- extensor carpi ulnaris
Nerve:
- extensor carpi radialis longus
- brevis
- extensor carpi ulnaris
1, 2. RADIAL
3. Post. interosseous nerve