Posterior Muscles Of Trunk

Front 1

most superficial muscle of posterior thorax; very broad origin and insertion

Back 1

trapezius (neck)

Front 2

originates from occipital bone; ligamentum nuchae; spines of c7 and all thoracic vertabrae

Back 2

trapezius (neck)

Front 3

inserted into acromion and spinous process of scapula; lateral third of clavicle

Back 3

trapezius (neck)

Front 4

extends head; raises, rotates and retracts (adducts) scapula and stabilizes it; superior fibers elevate scapula (as in shrugging shoulders); inferior fibers deppress it

Back 4

trapezius (neck)

Front 5

broad flat muscle of lower back (lumbar region); extensive superficial origins

Back 5

latissimus dorsi

Front 6

its origin is indirect attachement to spinous process of lower 6 thoracic vertebrea, lumbar vertebrae, last 3-4 ribs, and illiac crest

Back 6

latissimus dorsi

Front 7

inserted in floor of interbercular groove of humerus

Back 7

latissimus dorsi

Front 8

prime mover of arm extension; medially rotates arm; deppresses scapula; brings arm down in power stroke, as in striking a blow

Back 8

latissimus dorsi

Front 9

located inferiorly to teres minor and lateral and inferior to rhomboid

Back 9

teres major (shoulder)

Front 10

originates posterior surface at inferior angle of scapula

Back 10

teres major(shoulder)

Front 11

inserted in intrabercular groove of humerus

Back 11

teres major(shoulder)

Front 12

extends, medially rotates, and adducts humerous; synergist of latissimus dorsi

Back 12

teres major(shoulder)

Front 13

located at the back and side of neck, deep tp trapezius

Back 13

levator scapulae

Front 14

originates in transverse processes of C1-C4 (cervical vertebrae)

Back 14

levator scapulae

Front 15

inserted in medial border of scapula superior to spine

Back 15

levator scapulae

Front 16

pulls scapula medially (retraction); stabalizes scapula; rotates glenoid cavity downward

Back 16

rhomboid

Front 17

elevates and adducts scapula; with fixed scapula, flexes neck to the same side

Back 17

levator scapule

Front 18

beneath trapezius and inferior to levator scapulae

Back 18

rhomboids (minor is more superior)

Front 19

originates in the spinous process C7 and T1-T5 (thoracic vertebrea)

Back 19

rhomboids

Front 20

inserted in medial border of scapula

Back 20

rhomboids

Front 21

largest and most superficial of gluteal muscles (which form buttox mass); important injection site

Back 21

gluteus maximus (hip)

Front 22

originates in dorsal ilium, sacrum, and coccyx

Back 22

gluteus maximus (hip)

Front 23

inserted in gluteal tuberosity of femur and iliotibial tract

Back 23

gluteus maximus (hip)

Front 24

complex powerful thigh extensor (most effective when thigh is flexed, as in climbing stairs- but not in walking); antagonist of iliopsoas; laterally rotates and abducts thigh

Back 24

gluteus maximus (hip)

Front 25

partially covered by gluteus maximus; superior to it; important injection site

Back 25

gluteus medius (hip)

Front 26

originates in upper lateral surface of ilium

Back 26

gluteus medius (hip)

Front 27

inserted in greater trochanter of femur

Back 27

gluteus medius (hip)

Front 28

abducts and medially rotates thigh; steadies pelvis during walking

Back 28

gluteus medius (hip)

Front 29

abducts and medially rotate thigh

Back 29

gluteus medias

Front 30

laterally rotates and abducts thigh

Back 30

gluteus maximus