Brachium Muscles Flashcards
OINAs
Subclavius Action
depresses and anchors clavicle
Subclavius PA
junction of 1st rib and its costal cartilage
Subclavius DA
inferior surface of middle surface of clavicle
Subclavius Innervation
nerve to subclavius (C5, C6)
Anterior Scalene Action
flex neck laterally
elevate 1st rib during forced inhalation
Anterior Scalene SA
TP C3-C6
Anterior Scalene IA
1st rib
Anterior Scalene Innervation
cervical spinal nerve C4-C6
Middle Scalene Action
flex neck laterally
elevate 1st rib during forced inhalation
Middle Scalene SA
TP C5-C7
Middle Scalene IA
1st rib
Middle Scalene Innervation
anterior (ventral) rami of cervical spinal nerves
Posterior Scalene Action
flex neck laterally
elevate 2nd rib during forced inhalation
Posterior Scalene SA
TP C5-C7 (posterior tubercles)
Posterior Scalene IA
2nd rib
Posterior Scalene Innervation
anterior (ventral) rami of cervical spinal nerves C7 and C8
Biceps Brachii Action
supinate forearm
flex forearm
short head: resists dislocation of shoulder
Biceps Brachii PA
- short head: coracoid process
- long head: supraglenoid tubercle, labrum
Biceps Brachii DA
radial tuberosity, fascia of forearm via bicipital aponeurosis
Biceps Brachii Innervation
musculocutaneous nerve (C5, C6, C7)
Coracobrachialis Action
flex shoulder (GH joint)
adduct shoulder (GH joint)
resists dislocation of shoulder
Coracobrachialis PA
coracoid process
Coracobrachialis DA
middle humerus
Coracobrachialis Innervation
musculocutaneous nerve (C5, C6, C7)
Brachialis Action
flex elbow in all positions (humerolnar joint)
Brachialis PA
distal anterior humerus
Brachialis DA
ulnar tuberosity, coronoid process of ulna
Brachialis Innervation
musculocutaneous nerve (C5, C6), small branch from radial (C5, C7)
Brachioradialis Action
- flex elbow (humerolnar joint) in midpronated position
- assists to pronate and supinate forearm when these movements are resisted/from end range (humeroradial joint)
Brachioradialis PA
lateral supracondylar ridge of humerus
Brachioradialis DA
distal lateral radius (proximal to styloid process)
Brachioradialis Innervation
radial nerve (C5, C6, C7)
Triceps Brachii Action
chief extensor of forearm/elbow
long head: resists dislocation of humerus (especially important during adduction)
Triceps Brachii PA
- long head: infraglenoid tubercle
- lateral head: posterior humerus, superior (lateral) to radial groove
- medial head: posterior humerus, inferior (medial) to radial groove
Triceps Brachii DA
olecranon of ulna
Triceps Brachii Innervation
radial nerve (C6, C7, C8)
