O,I,A,N Flashcards
(41 cards)
Pectoralis Major
O: 1. Clavicular head; medial clavicle
2. Sternocostal head: sternum and costal cartilages of ribs 2-6
I: greater tubercle and lateral lip of intertubercular groove of humerus
A: flexion, adduction & medial rotation of humerus
N: Medial & lateral pectoral n.
Pectoralis minor
O: ribs 2-5 near costal ridges
I: coracoid process of scapula
A: Abduction & downward rotation of scapula; assists in elevation of ribs when pectoral girdle is fixed
N: medial pectoral n.
Subclavius
O: 1st rib
I: subclavian groove of clavicle
A: depress clavicle
N: subclavian n.
Serratus anterior
O: ribs 1-8
I: medial border and inferior angle of the scapula
A: abduction & upward rotation of scapula (protraction)
N: long thoracic n.
Serratus posterior superior
O: ligamentum nuchae & spinous processes of C7-T3 vertebrae
I: superior border of ribs 2 to 4
A: elevation of ribs
N: 2-5 intercostal n.
Serratus posterior inferior
O: spinous processes of T11-L2 vertebrae
I: inferior borders of ribs 8-12 near their angles
A: depression of ribs
N: 9-12 thoracic spinal n.
Trapezius
O: occipital bone, ligamentum nuchae & spinous processes of C7-T12
I: lateral 1/3 of clavicle, spine & acromion of scapula
A: 1. Superior fibers: upward rotation of scapula; can also help extend the head
2. Middle fibers: adduction of scapula (retraction)
3. Inferior fibers: depression & upward rotation of scapula
N: accessory n. (CN XI) and cervical spinal n. C3-C5
Latissimus Dorsi
O: spinous processes of T7-L5, sacral crest, iliac crest and inferior 4 ribs
I: floor of intertubercular groove of humerus
A: extension, adduction & medial rotation of humerus
N. Thoracodorsal n.
Levator scapula
O: transverse processes of C1-C4
I: Upper 1/3 of medial border of scapula
A: elevation & downward rotation of scapula
N: dorsal scapular n. and cervical n. C3-C5
Rhomboid Major
O: spinous processes of T2-T5
I: lower 1/3 of medial border of scapula
A: elevation, adduction & downward rotation of scapula; stabilizes scapula
N: dorsal scapular n.
Rhomboid minor
O: spinous processes of C7-T1
I: medial border of scapula superior to spine
A: elevation, adduction & downward rotation of scapula; stabilizes scapula
N: dorsal scapular n.
Deltoid
O: lateral 1/3 of clavicle, acromion and spine of scapula
I: deltoid tuberosity of humerus
A: 1. Anterior fibers: flexion & medial rotation of humerus
2. Lateral fibers: abduction of humerus
3. Posterior fibers: extension & lateral rotation of humerus
N: axillary n.
Infraspinatus
O: infraspinous fossa of scapula
I: greater tubercle of humerus
A: lateral rotation of humerus at shoulder joint
N. Suprascapular n.
Teres minor
O: inferior lateral border of scapula
I: greater tubercle of humerus
A: lateral rotation of humerus at shoulder joint
N: axillary n.
Teres major
O: inferior angle of scapula
I: medial lip of intertubercular groove of humerus
A: extends and assists in adduction & medial rotation of humerus at shoulder joint
N: lower subscapular n.
Subscapularis
O: subscapular fossa of scapula
I: lesser tubercle of humerus
A: medial rotation of humerus at shoulder joint
N: upper & lower subscapular n.
Biceps brachii
O: 1. Long head: supraglenoid tubercle of scapula
2. Short head: coracoid process of scapula
I: radial tuberosity of radius & deep fascia of forearm via bicipital aponévroses
A: flexion of forearm at elbow joint, supination of forearm at radio-ulnar joint, flexion of humerus at shoulder joint
N: musculocutaneous n.
Brachialis
O: distal anterior surface of humerus
I: ulnar tuberosity and coronoid process of ulna
A: flexion of forearm at elbow joint
N: Musculocutaneous & radial n.
Coracobrachialis
O: coracoid process of scapula
I: middle 1/3 of medial surface of shaft of humerus
A: flexion and adduction of humerus at shoulder joint
N: musculocutaneous n.
Triceps brachii
O: 1. Long head: infraglenoid tubercle of scapula
2. Lateral head: lateral and posterior surface of humerus , above radial groove
3. Medial head: posterior surface of humerus, below radial groove
I: olecranon process of ulna
A: extension of humerus at shoulder joint & extension of forearm at elbow joint
N: radial n.
Brachioradialis
O: lateral border of distal end of humerus
I: superior to styloid process of radius
A: flexion of forearm at elbow joint
N: radial n.
Pronator Teres
O: medial epicondyle of humerus and coronoid process of ulna
I: mid-lateral shaft of radius
A: pronator of forearm at radioulnar joint, flexion of forearm at elbow joint
N: median n.
Flexor carpi radialis
O: medial epicondyle of humerus
I: base of 2nd & 3rd metacarpal
A: flexion & abduction (radial deviation) of hand at wrist joint
N: median n.
Palmaris longus
O: medial epicondyle of humerus
I: flexor retinaculum & palmar aponeurosis
A: tenses palmar aponeurosis, flexion of hand at wrist joint
N: median n.
