Muscles Bones and Insertions

Upper Trap origin

occipital bone

upper trap insertion

acromion process

upper trap action

scapula elevation / upward rotation

upper trap innervation

CN 11

Middle trap origin

C7 - T3

middle trap insertion

spine of scapula

middle trap action

scapular retraction

middle trap innervation

CN 11

lower trap origin

middle / lower thoracic vertebrae

lower trap insertion

base of scapular spine

lower trap action

depresses and retracts scapula

levator scapula origin

1-4 cervical vertibrae

levator scapula insertion

superior angle of scapula

levator scapula action

helps to elevate scapula

levator scapula innervation

dorsal scapular nerve

rhomboid origin

C7 -T5

rhomboid insertion

vertebral border of scapula

rhomboid action

scapular retraction / elevation / upward rotation

rhomboid innervation

dorsal scapular nerve

serratus anterior origin

first 3-5 ribs

serratus anterior insertion

coracoid process

serratus anterior action

scapular depression / protraction / downward rotation

serratus anterior innervation

median pectoral nerve

anterior deltoid origin

lateral 1/3rd of clavicle

anterior deltoid insertion

deltoid tuberosity

anterior deltoid action

shoulder flexion / internal rotation / abduction / horizontal abduction

anterior deltoid innervation

axillary nerve

middle deltoid origin

acromion process

middle deltoid insertion

deltoid tuberosity

middle deltoid action

shoulder abduction

middle deltoid innervation

axillary nerve

posterior deltoid origin

spine of scapula

posterior deltoid insertion

deltoid tuberosity

posterior deltoid action

shoulder abduction , extension , external rotation

posterior deltoid innervation

pec major origin

clavicle, sternum ribs 1-6

pec major insertion

bicipital groove

pec major action

shoulder adduction , horizontal adduction

pec major innervation

pectoral nerves

latissimus dorsi origin

T7 - L5 , sacrum , iliac crest

latissimus dorsi insertion

bicipital groove

latissimus dorsi action

shoulder extension , shoulder horizontal adduction

latissimus dorsi innervation

thoracodorsal nerves

teres major origin

axillary border

teres major insertion

bicipital groove

teres major action

shoulder extension, adduction, internal rotation

teres major innervation

lower subscapular nerve

supraspinatus origin

supraspinous fossa

supraspinous insertion

greater tubercle of humerus

supraspinatus action

abduction

supraspinatus innervation

suprascapular nerve

infraspinatus origin

infraspinous fossa

infraspinatus insertion

greater tubercle of humerus

infraspinatus action

external rotation, horizontal abduction

infraspinatus innervation

suprascapular nerve

teres minor origin

axillary border of scapula

teres minor insertion

greater tubercle of humerus

teres minor action

shoulder external rotation , horizontal abduction

teres minor innervation

axillary nerve

subscapularis origin

subscapular fossa

subscapularis insertion

lesser tubercle of humerus

subscapularis action

shoulder internal rotation

subscapularis innervation

subscapular nerve

coracobrachialis origin

coracoid process

coracobrachialis insertion

medial humerus

coracobrachialis action

stabilizes shoulder

coracobrachialis innervation

musculotanious nerve

brachioradialis origin

Lateral supracondylar ridge of humerus

brachioradialis insertion

styloid process of radius

brachioradialis action

elbow flexion

brachioradialis nerve

radial nerve

biceps long head origin

supraglenoid tubercle

biceps short head origin

coracoid process

biceps insertion

radial tuberosity

biceps action

elbow flexion, forearm supination

biceps innervation

musculocutaneous nerve

brachialis origin

distal anterior half of humerus

brachialis insertion

ulnar tuberosity

brachialis action

elbow flexion

brachialis innervation

musculocutaneous nerve

supinator origin

lateral epicondyle

supinator insertion

anterior surface of proximal radius

supinator action

supination

supinator innervation

radial nerve

anconeus action

helps tricep in elbow extension

tricep long head origin

infraglenoid tubercle of scapula

tricep lateral head origin

inferior to greater tubercle on posterior Humerus

tricep medial head origin

posterior surface of humerus

tricep insertion

olecranon process

tricep action

elbow extention

tricep innervation

radial nerve

pronator teres origin

medial epicondyle & coranoid process

pronator teres insertion

lateral radius at midpoint

pronator teres action

pronation

pronator teres innervation

median nerve

pronator quadratus origin

distal ulna

pronator quadratus insertion

distal radius

pronator quadratus action

pronation

pronator quadratus innervation

median nerve