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sternocleiodmastoid (action)

Flexes and laterally rotates the head

Scalenes (Ant, mid, post)

Elevate fist two ribs,
Aid in inspiration

Splenius capitis and cervicis

Extension/hyperextension of head

Erector spinae
(iliocostalis, Longissimus, spinalis)

trunk extension, rotation, and lateral flexion of vertebral column

(Thoracis, cervicis, capitis region)

Extends vertebral column

Quadratus lumborum (action)

Flexes vertebral column laterally, pelvic elevation

External intercostals (action)

Pulls ribs toward one another to elevate rib cage

Internal intercostals (action)

Draws ribs together and depress rib cage

Diaphragm (innervation)

Phernic n. C4

Diaphragm (action)

Prime mover of inspiration; flattens on contraction

External / Internal oblique (action)

Compresses abdominal contents

Trunk rotation and lateral flexion

Transversus abdominis (action)

Compresses abdominal contents

Rectus abdominis (action)

Flex and rotate lumbar region of vertebral column

Pectoralis major (action)

Prime mover of arm flexion;
rotates arm medially;
adducts arm

Pectoralis major (origin)

Sternal end of clavicle, sternum, cartilage of ribs 1-6, and aponeurosis of external oblique m.

Pectoralis major (insertion)

Fibers converge to insert by a short tendon into lateral side of the intertubercular sulcus of the humerus

Pectoralis major (innerveration)

Lateral and medial pectoral nn. C5-8, T1

Pectoralis minor (origin)

Anterior surface of ribs 3-5 (or 2-4)

Pectoralis minor (insertion)

Coracoid process of scapula

Pectoralis minor (innervation)

Medial and lateral pectoral nn. C6-8

Pectoralis minor (action)

With ribs fixed, draws scapula forward

Serratus anterior (origin)

muscle slips from ribs 1-8 or 9

Serratus anterior (insertion)

Entire anterior surface of vertebral border of scapula

Serratus anterior (innervation)

Long thoracic n. C5-7

Serratus anterior (action)

Rotates scapula so that its inferior angle moves laterally and upward
Scapular abduction

Trapezius I ( upper fibers) (Origin)

Occipital protruberance,
spinous processes C1-7

Trapezius I ( upper fibers) (Insertion)

Lateral 1/3 of clavicle and acromion of scapula

Trapezius I ( upper fibers) (Innervation)

Accessory n. C3-4

Trapezius I ( upper fibers) (Action)

Scapular elevation, scapular upward rotation

Trapezius II (middle fibers) (origin)

spinous processes C1-T5

Trapezius II (middle fibers) (insertion)

Medial margin of acromion process, superior spine of scapula

Trapezius II (middle fibers) (innervation)

Accessory n. ,C3-4

Trapezius II (middle fibers) (action)

Scapular adduction

Trapezius III (lower fibers) (origin)

spinous processes T6-12

Trapezius III (lower fibers) (insertion)

Medial spine of scapula and tubercle at apex of spine of scapula

Trapezius III (lower fibers) (innervation)

Accessory n. C3-4

Trapezius III (lower fibers) (action)

Scapular depression, and upward rotation

Levator scapulae (origin)

Transverses processes of C1-4

Levator scapulae (insertion)

Medial border of scapula, superior to the spine
(superior angle of scapula)

Levator scapulae (innervation)

dorsal scapular n. C4-5

Levator scapulae (action)

Elevates /adducts scapula

Rhomboid major (origin)

spinous processes of T2-5

Rhomboid major (insertion)

Medial border of scapula

Rhomboid major (Innervation)

Dorsal scapular n. C4-5

Rhomboid major (action)

scapula adduction and downward rotation

Rhomboid minor (origin)

Ligamentum nuchae and Spinous processes C7- T1

Rhomboid minor (insertion)

Medial border of scapula

Rhomboid minor (innervation)

Dorsal scapular n. C4-5

Rhomboid minor (action)

Stabilize and addicts scapula

Latissimus dorsi (origin)

Spinous processes of T7 -T12, thoracolumbar fascia, iliac crest, and inferior 3 or 4 ribs

Latissimus dorsi (insertion)

intertubercular sulcus of humerus

Latissimus dorsi (innervation)

Thoracodorsal n. C6-8

Latissimus dorsi (action)

Prime mover of arm extension; adduction and medial rotation at shoulder

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