Lab Exam #3 Anterior Muscles Of Human Thorax, Shoulder, Abdominal Wall, And Trunk

Front 1

pectoralis major

Back 1

origin-clavicle sternum
insertion- humerus
action- rotates arm

Front 2

serratus anterior

Back 2

origin- ribs
insertion- scapula
action- moves scapula forward

Front 3

deltoid

Back 3

origin- clavicle
insertion- deltoid tuberosity
action- arm abduction

Front 4

pectoralis minor

Back 4

origin- ribs
insertion- coracoid process of scapula
action- draws scapula forward

Front 5

external intercostals

Back 5

origin- border of rib
insertion- border of rib below
action- elevate rib cage

Front 6

internal intercostals

Back 6

origin- border of rib below
insertion- border of rib
action- ribs together

Front 7

diaprhagm

Back 7

origin- border of rib and sternum
insertion- central tendon
action- prime mover of inspiration

Front 8

rectus abdominis

Back 8

origin- pubic crest
insertion- costal cartilages
action- flexes veterbral column

Front 9

external oblique

Back 9

origin- last eight ribs
insertion- pubic crest
action- oblique curls

Front 10

internal oblique

Back 10

origin- lumbar fascia
insertion- pubic crest
action- oblique curls, trunk rotation

Front 11

transversus abdominus

Back 11

origin- iliac crest, inguinal ligament
insertion- pubic crest, linea alba
action- compresses abdominal contents

Front 12

trapezius

Back 12

origin- occipital bone
insertion- scapula
action- extends head, raises scapula

Front 13

latissimus dorsi

Back 13

origin- lumbar vertebrae, thoracic and lumbar spine
insertion- humerus
action- arm extension, adduction, rotation

Front 14

infraspinatus

Back 14

origin- fossa of scapula
insertion- tubercle of humerus
action- lateral rotation of humerus

Front 15

teres minor

Back 15

origin- scapula
insertion- tubercle of humerus
action- lateral rotation of humerus

Front 16

teres major

Back 16

origin- inferior angle of scapula
insertion- intertubercular sulcus of humerus
action- extends, adducts, rotates humerus

Front 17

supraspinatus

Back 17

origin- fossa of scapula
insertion- tubercle of humerus
action- abduction of humerus

Front 18

levator scapulae

Back 18

origin- vervical spine
insertion- scapula
action- elevates and adducts scapula

Front 19

rhomboids major and minor

Back 19

origin- cervical, thoracic spine
insertion- scapula
action- pulls scapula medially

Front 20

semispinalis

Back 20

origin- cervical, thoracic spine
insertion- occipital bone
action- extend neck and vertebral column

Front 21

erector spinae

Back 21

origin- iliac crest, pransverse processes of lumbar
insertion- ribs, vertebrae, mastoid process
action- extend bend vertebral column

Front 22

splenius

Back 22

origin- ligamentum nuchae, spinous processes of cervical and thoracic spine
insertion- mastoid process
action- hyperextend head

Front 23

quadratus lumborum

Back 23

origin- iliac crest
insertion- border of rib 12
action- upright posture