SHOULDER COMPLEX (MOINA)

PECTORALIS MAJOR

ORIGIN

- Medial half of clavicle (clavicular head) Sternum, 1st-6th costal cartilages (sternal head)

INSERTION

- Lateral lip of bicipital groove of humerus

ACTION

- Shoulder flexion, adduction, IR

NERVE SUPPLY

- Medial pectoral nerve Lateral pectoral nerve

PECTORALIS MINOR

ORIGIN

- 3rd-5th ribs

INSERTION

- Coracoid process of scapula

ACTION

- Scapular depression

Elevation of ribs

NERVE SUPPLY

- Medial pectoral nerve

SUBCLAVIUS

ORIGIN

- 1st costal cartilage

INSERTION

- Middle 1/3 of clavicle

ACTION

- Clavicular depression

NERVE SUPPLY

- Nerve to subclavius

SERRATUS ANTERIOR

ORIGIN

- 1st-8th ribs

INSERTION

- Medial border and inferior angle of scapula

ACTION

- Scapular protraction, depression, upward rotation

NERVE SUPPLY

- Long thoracic nerve

TRAPEZIUS

ORIGIN

- Superior nuchal line, external occipital protuberance of occipital bone

Ligamentum nuchae Spinous process of C7-T12

INSERTION

- Lateral 1/3 of clavicle (upper fibers)

Acromion and spine of scapula (middle and lower

fibers)

ACTION

- Scapular elevation (upper fibers) adduction (middle fibers)

depression (lower fibers)

adduction, upward rotation (all fibers)

Capital and cervical extension (bilateral)

with ipsilateral lateral flexion and contralateral

rotation (unilateral)

NERVE SUPPLY

- Spinal accessory nerve Ventral rami of C3-C4

LATISSIMUS DORSI

ORIGIN

- Iliac crest

Thoracoumbar fascia Spinous process of T7-T12 8th/9th-12th ribs

Inferior angle of scapula

INSERTION

- Floor of bicipital groove of humerus

ACTION

- Shoulder extension, adduction, IR

NERVE SUPPLY

- Thoracodorsal nerve

LEVATOR SCAPULA

ORIGIN

- Transverse process of C1-C4

INSERTION

- Levator scapula

Transverse process of C1-C4

Medial border of scapula from superior border to root of spine

ACTION

- Scapular elevation

Capital and cervical extension (bilateral)

with ipsilateral lateral flexion and rotation (unilateral)

NERVE SUPPLY

- Dorsal scapular nerve Ventral rami of C3-C4

RHOMOID MINOR

ORIGIN

- Ligamentum nuchae Spinous process of C7-T1

INSERTION

- Medial border of scapula at the root of the spine

ACTION

- Scapular adduction, elevation, downward rotation

NERVE SUPPLY

- Dorsal scapular nerve

RHOMBOID MAJOR

ORIGIN

- Spinous process of T2-T5

INSERTION

- Medial border of scapula from the root of the spine to inferior angle

ACTION

- Scapular adduction, elevation, downward rotation

NERVE SUPPLY

- Dorsal scapular nerve

DELTOID

ORIGIN

- Lateral 1/3 of clavicle Acromion and spine of scapula

INSERTION

- Lateral midshaft/deltoid tuberosity of humerus

ACTION

- Shoulder abduction

*Shoulder flexion, IR (anterior fibers)

*Shoulder extension, ER (posterior fibers)

NERVE SUPPLY

- Axillary nerve

SUPRASPINATUS

ORIGIN

- Supraspinous fossa of scapula

INSERTION

- Greater tuberosity of humerus at the superior facet Shoulder joint capsule

ACTION

- Shoulder abduction

NERVE SUPPLY

- Suprascapular nerve

INFRASPINATUS

ORIGIN

- Infraspinous fossa of scapula

INSERTION

- Greater tuberosity of humerus at the middle facet Shoulder joint capsule

ACTION

- Shoulder ER

NERVE SUPPLY

- Suprascapular nerve

TERES MINOR

ORIGIN

- Upper 2/3 of lateral border of scapula

INSERTION

- Greater tuberosity of humerus at the inferior facet Shoulder joint capsule

ACTION

- Shoulder ER

NERVE SUPPLY

- Axillary nerve

TERES MAJOR

ORIGIN

- Lower 1/3 of lateral border of scapula

INSERTION

- Medial lip of bicipital groove of humerus

ACTION

- Shoulder adduction, IR

NERVE SUPPLY

- Lower subscapular nerve

SUBSCAPULARIS

ORIGIN

- Subscapular fossa of scapula

INSERTION

- Lesser tuberosity of humerus

ACTION

- Shoulder IR

NERVE SUPPLY

-Upper subscapular nerve

Lower subscapular nerve

BICEPS BRACHII

ORIGIN

- Supraglenoid tubercle of scapula (long head) Coracoid process of scapula (short head)

INSERTION

- Radial tuberosity

Bicipital aponeurosis to the deep fascia of forearm

ACTION

- Elbow flexion Forearm supination

*Shoulder flexion

NERVE SUPPLY

- Musculocutaneous nerve

CORACOBRACHIALIS

ORIGIN

- Coracoid process of scapula

INSERTION

- Medial shaft of the humerus

ACTION

- Shoulder flexion, adduction

NERVE SUPPLY

- Musculocutaneous nerve

BRACHIALIS

ORIGIN

- Lower 1/2 of anterior shaft of humerus

INSERTION

- Coronoid process of ulna

ACTION

- Elbow flexion

NERVE SUPPLY

- Musculocutaneous nerve Radial nerve (lateral part)

TRICEPS BRACHII

ORIGIN

- Infraglenoid tubercle of scapula (long head) Upper 1/2 of posterior shaft of humerus (lateral

head)

Lower 1/2 of posterior shaft of humerus (medial

head)

INSERTION

- Olecranon process of ulna

ACTION

- Elbow extension

*Shoulder extension, adduction (long head)

NERVE SUPPLY

- Radial nerve