a&p ch 10 muscle origin, insertion, action

pectoralis major origin

medial clavicle; costal cartilages 1-7

pectoralis major insertion

intertubercular sulcus of humerus

pectoralis major action

flexes, adducts, and medially rotates arm

latissimus dorse origin

vertebrae T7-L5; lower 3-4 ribs; iliac crest

latissimus dorse insertion

intertubercular sulcus of humerus

latissimus dorsi action

extends, adducts, and medially rotates arm; draws shoulder inferiorly

deltoid origin

acromion and spine of scapula, clavicle

deltoid insertion

deltoid tuberosity of humerus

deltoid action

abducts arm; flexes, extends, medially and laterally rotates arm

teres major origin

inferior angle of scapula

teres major insertion

intertubercular sulcus of humerus

teres major action

extends, medially rotates, and adducts arm

coracobrachialis origin

coracoid process of scapula

coracobrachialis insertion

medial surface of humerus shaft

coracobrachialis action

flexes and medially rotates arm

supraspinatus origin

supraspinous fossa of the scapula

supraspinatus insertion

greater tubercle of the humerus

supraspinatus action

abduction arm, helps stabilize shoulder joint

infraspinatus origin

intraspinous fossa of scapula

infraspinatus insertion

greater tubercle of humerus

infraspinatus action

laterally rotates arm, stabilizes shoulder joint

teres minor origin

lateral border of dorsal scapular surface

teres minor insertion

greater tubercle of humerus

teres minor action

laterally rotates arm, stabilizes shoulder joint

subscapularis origin

subscapular fossa of scapula

subscapularis insertion

lesser tubercle of humerus

subscapularis action

medially rotates arm, stabilizes shoulder joint

brachialis origin

distal half of humerus

brachialis insertion

coronoid process and tuberosity of ulna

brachialis action

a major forearm flexor

biceps brachii origin

short head: coracoid process
long head: glenoid cavity

biceps brachii insertion

radial tuberosity

biceps brachii action

flexes forearm

triceps brachii origin

long head: glenoid cavity
lateral head: proximal end of humerus
medial head: humeral shaft

triceps brachii insertion

olecranon

triceps brachii action

extends and adducts arm, extends forearm

brachioradialis origin

supracondylar ridge of humerus

brachioradialis insertion

base of radial styloid process

brachioradialis action

flexes forearm

anconeus origin

lateral epicondyle of humerus

anconeus insertion

olecranon and posterior surface of ulna

anconeus action

extends forearm

pronator quadratus origin

distal ulna

pronator quadratus insertion

distal radius

pronator quadratus action

pronates hand, flexes forearm

pronator teres origin

humerus shaft; coronoid process of ulna

pronator teres insertion

shaft of radius

pronator teres action

pronates hand, flexes forearm

supinator origin

lateral epicondyle of humerus; supinator crest and fossa of ulna

supinator insertion

proximal end of radius

supinator action

supinates forearm/hand

iliacus origin

iliac fossa and crest; superolateral sacrum

iliacis insertion

lesser trochanter and shaft of femur

iliacus action

flexes thigh and lumbar vertebrae

psoas major origin

bodies and transverse processes of T12-L5 verts

psoas major insertion

lesser trochanter and shaft of femur

psoas major action

flexes thigh and lumbar vertebrae

sartorius origin

anterior superior iliac spin

sartorius insertios

proximal end of tibia

sartorius action

flexes, abducts, and laterally rotates thigh

tensor fasciae latae origin

iliac crest; anterior superior iliac spine

tensor fasciae latae insertion

lateral condyle of tibia

tensor fasciae latae action

flexes, abducts, and medially rotates thigh

gluteus maximus origin

posterior gluteal line of ilium; posterior surface of ilium; coccyx; lower sacrum

gluteus maximus insertion

gluteal tuberosity of femur

gluteus maximus action

extends and abducts thigh, braces knee

gluteus medius and gluteus minimus origin

ilium between crest and acetabulum

gluteus medius and gluteus minimus insertion

greater trochanter of femur

gluteus medius and gluteus minimus action

abducts and medially rotates thigh

gemellus superior origin

ischial spine

gemellus superior insertion

greater trochanter of femur

gemellus superior action

rotates extended thigh laterally; abducts flexed thigh

gemellus inferior origin

ischial tuberosity

gemellus inferior insertion

greater trochanter of femur

gemellus inferior action

rotates extended thigh laterally

obturator externus origin

pubic and ischial rami

obturator externus insertion

femur between head and greater trochanter

obturator externus action

rotates extended thigh laterally

obturator internus origin

pubic and ischial rami; surface of lesser pelvis

obturator internus insertion

greater trochanter of femur

obturator internus action

rotates extended thigh laterally; abducts flexed thigh

piriformis origin

anterior surface of sacrum; gluteal surface of ilium

piriformis insertion

greater trochanter of femur

piriformis action

rotates extended thigh laterally; abducts flexed thigh

quadratus femoris origin

ischial tuberosity

quadratus femoris insertion

intertrochanteric crest of femur

quadratus femoris action

rotates thigh laterally and stabilizes hip joint

adductor brevis origin

body and inferior pubic ramus

adductor brevis insertion

linea aspera and spiral line of femur

adductor brevis action

adducts thigh

adductor longus origin

body and inferior ramus of pubis

adductor longus insertion

linea aspera

adductor longus action

adducts, flexes, and medially rotates thigh

adductor magnus origin

pubic and ischial rami, ischial tuberosity

adductor magnus insertion

linea aspera of femur; gluteal tuberosity; medial supracondylar line of femur

adductor magnus action

aadducts, extends, and medially rotates thigh

gracilis origin

inbody and inferior ramus of pubis; ramus of ischium

gracilis insertion

medial tibia below condyle

gracilis action

adducts thigh, flexes leg

pectineus origin

superior ramus of pubis