muscle chart 1-10

origin of pectoralis major

clavicular head & sternocostal head

insertion of pectoralis major

lateral lip of intertubercular sulcus of humerus

action of pectoralis major

adducts and medially rotates shoulder

clavicular head flexes shoulder

sternocostal head extends shoulder from flexed position (draws scapula anteriorly/inferiorly)

innervation of pectoralis major

lateral and medial pectoral nerves (C5-C6 & C7-T1)

origin of pectoralis minor

ribs 3-5

insertion of pectoralis minor

coracoid process of scapula

action of pectoralis minor

stabilizes scapula and drawing it anteriorly/inferiorly against thoracic wall

innervation of pectoralis minor

lateral and medial pectoral nerves (C8-T1)

origin of subclavius

1st rib and its costal cartilage

insertion of subclavius

inferior surface of clavicle

action of subclavius

anchors and depresses clavicle

innervation of subclavius

subclavian nerve (C5-C6)

origin of serratus anterior

external/lateral surfaces of ribs 1-8/9

insertion of serratus anterior

anterior border of medial border of scapula

action of serratus anterior

protracts, holds against thoracic wall, and upwardly rotates scapula

innervation of serratus anterior

long thoracic nerve (C5-C7)

origin of trapezius

medial superior nuchal line, external occipital protuberance, nuchal ligament, and spinous processes of C7-T12

insertion of trapezius

lateral clavicle, acromion, and spine of scapula

action of trapezius

upper: elevates

middle: retracts

lower: depresses

upper + lower: upwardly rotate scapula

innervation of trapezius

spinal accessory nerve for motor (CN XI), C3-C4 spinal nerves for pain/proprioception

origin of latissimus dorsi

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

insertion of latissimus dorsi

floor of intertubercular sulcus of humerus

action of latissimus dorsi

extension, adduction, and internal rotation

innervation of latissimus dorsi

thoracodorsal nerve (C6-C8)

origin of levator scapulae

posterior tubercules of transverse processes of C-C4

insertion of levator scapulae

medial border of scapula superior to spine

action of levator scapulae

elevates and downwardly rotates scapula

innervation of levator scapulae

dorsal scapular nerve (C5) and cervical spinal nerve (C3-C4)

origin of rhomboid minor

spinous processes of C7-T1

insertion of rhomboid minor

medial border of scapula at medial end of spine

action of rhomboid minor

retracts and downwardly rotates scapula (fixes to thoracic wall)

innervation of rhomboid minor

dorsal scapular nerve (C4-C5)

origin of rhomboid major

spinous processes of T2-T5

insertion of rhomboid major

medial border of scapula inferior to spine

action of rhomboid major

retracts and downwardly rotates scapula (fixes to thoracic wall)

innervation of rhomboid major

dorsal scapular nerve (C4-C5)

origin of deltoid

clavicular head (lateral)

acromial head (acromion)

spinal head (spine of scapula)

insertion of deltoid

deltoid tuberosity

action of deltoid

anterior: flexion

middle: abduction

posterior: extension and external rotation

innervation of deltoid

axillary nerve (C-C6)