Anatomy Midterm - Muscles

Muscles

subclavius (origin)

1st rib & costal cartilage

subclavius (insertion)

interior surface of middle 1/3 of clavicle

subclavius (nerve innervation)

subclavian nerve

subclavius (blood supply)

thoracromical artery

subclavius (action)

depression of clavicle 

pectoralis major (origins)

Clavicular - anterior surface of medial ½ of clavicle 

Sternal - anterior surface of length of sternum

Costal - costal cartilages of ribs 1-6 (& aponeurosis of external oblique)

pectoralis major (insertion)

lateral lip of intertubercular groove 

pectoralis major (nerve innervation)

lateral & medial pectoral nerves

pectoralis major (blood supply)

thoracoacromial artery

pectoralis major (action)

adduction, medial rotation, flexion, & extension at shoulder

pectoralis minor (origin)

ribs 3-5

pectoralis minor (insertion)

coracoid process

pectoralis minor (nerve innervation)

medial pectoral nerve

pectoralis minor (blood supply)

thoracoacromial artery

pectoralis minor (action)

stabilizes & draws scapula anteriorly/inferiorly

serratus anterior (origin)

external surface of ribs 1-8

serratus anterior (insertion)

anterior surface of medial border of scapula

serratus anterior (nerve innervation)

long thoracic nerve

serratus anterior (blood supply)

lateral thoracic & thoracodorsal arteries

serratus anterior (action)

protraction of scapula

levator scapulae (origin)

transverse processes of C1-C4

levator scapulae (insertion)

medial border of scapula to root of spine

levator scapulae (nerve innervation)

dorsal scapular nerve, C3 & C4

levator scapulae (blood supply)

dorsal scapular artery

levator scapulae (action)

elevation of scapula

trapezius (origin)

medial 1/3 of superior nuchal line, external occipital protuberance, nuchal ligament, spinous processes of C7-T12

trapezius (insertion)

lateral 1/3 of clavicle, acromion, & spine of scapula

trapezius (nerve innervation)

spinal accessory nerve, C3 & C4

trapezius (blood supply)

transverse cervical arteries

trapezius (action)

elevation, depression, & retraction of scapula

rhomboid major (origin)

spinous processes of T2-T5

rhomboid major (insertion)

medial border of scapula

rhomboid major (nerve innervation)

dorsal scapular nerve

rhomboid major (blood supply) 

dorsal scapular artery

rhomboid major (action)

retraction of scapula & fixes scapula to thoracic wall

rhomboid minor (origin)

spinous processes of C7-T1

rhomboid minor (insertion)

medial border of scapula

rhomboid minor (nerve innervation)

dorsal scapular nerve

rhomboid minor (blood supply)

dorsal scapular artery

rhomboid minor (action)

retraction of scapula & fixes scapula to thoracic wall

deltoid (origin)

lateral 1/3 of clavicle, acromion, & spine of scapula

deltoid (insertion)

deltoid tuberosity

deltoid (nerve innervation)

axillary nerve

deltoid (blood supply)

thoracoacromial, anterior & posterior circumflex humeral arteries

deltoid (action)

flexion, extension, medial rotation, lateral rotation, & abduction at shoulder

latissimus dorsi (origin)

spinous processes of T6-T12, thoracolumbar fascia, ribs 8-12, illiac crest

latissimus dorsi (insertion)

medial lip of intertubercular groove

latissimus dorsi (nerve innervation) 

thoracodorsal nerve

latissimus dorsi (blood supply)

thoracodorsal & subscapular arteries

latissimus dorsi (action)

extension, adduction, & medial rotation at shoulder

teres major (origin)

inferior lateral border & inferior angle of scapula

teres major (insertion)

medial lip of intertubercular groove

teres major (nerve innervation)

lower subscapular nerve

teres major (blood supply)

circumflex scapular artery

teres major (action)

medial rotation & adduction at shoulder

teres minor (origin)

middle part of lateral border of scapula

teres minor (insertion)

inferior facet of greater tubercle

teres minor (nerve innervation)

axillary nerve

teres minor (blood supply)

circumflex scapular artery

teres minor (action)

lateral rotation at shoulder

infraspinatus (origin)

infraspinous fossa

infraspinatus (insertion)

middle facet of greater tubercle

infraspinatus (nerve innervation)

suprascapular nerve 

infraspinatus (blood supply)

circumflex scapular & suprascapular arteries

infraspinatus (action)

lateral rotation at shoulder

supraspinatus (origin)

suprascapular fossa

supraspinatus (insertion)

superior facet of greater tubercle

supraspinatus (nerve innervation)

suprascapular nerve

supraspinatus (blood supply)

suprascapular artery

supraspinatus (action)

abduction at shoulder

subscapularis (origin)

subscapular fossa

subscapularis (insertion)

lesser tubercle

subscapularis (nerve innervation)

upper & lower subscapular nerves

subscapularis (blood supply)

subscapular artery

subscapularis (action)

medial rotation at shoulder

coracobrachialis (origin)

coracoid process

coracobrachialis (insertion)

middle 1/3 of medial surface of humerus

coracobrachialis (nerve innervation)

musculocutaneous nerve

coracobrachialis (blood supply)

brachial artery

coracobrachialis (action)

flexion & adduction at shoulder

biceps brachii (origins)

short head - coracoid process

long head - supraglenoid tubercle

biceps brachii (insertion)

radial tuberosity

biceps brachii (nerve innervation)

musculocutaneous nerve

biceps brachii (blood supply)

brachial artery

biceps brachii (action)

flexion at elbow, supination of forearm, (& flexion at shoulder - long head only)

brachialis (origin)

distal ½ of anterior surface of humerus

brachialis (insertion)

coronoid process & ulnar tuberosity

brachialis (nerve innervation)

musculocutaneous nerve

brachialis (blood supply)

radial recurrent artery

brachialis (action)

flexion at elbow (only when forearm is in a supinated position)

triceps brachii (origins)

long head - infraglenoid tubercle

lateral head - posterior surface of humerus, superior to radial groove

medial head - posterior surface of humerus, inferior to radial groove

triceps brachii (insertion)

proximal end of olecranon of ulna

triceps brachii (nerve innervation)

radial nerve

triceps brachii (blood supply)

radial recurrent artery

triceps brachii (action)

extension at elbow & shoulder

brachioradialis (origin)

proximal 2/3 of lateral supracondylar ridge of humerus

brachioradialis (insertion)

lateral surface of distal end of radius proximal to styloid process

brachioradialis (nerve innervation)

radial nerve

brachioradialis (blood supply)

radial recurrent artery

brachioradialis (action)

flexion at elbow (only in midpronanted position)