Thoracic And Abdominal Muscles

Front 1

External Intercostal
origin

Back 1

Inferior margin of superior rib

Front 2

External Intercostal
insertion

Back 2

Superior margin of inferior rib

Front 3

External Intercostal
innervation

Back 3

Intercostal nerves

Front 4

External Intercostal
action

Back 4

Elevate ribs, stabilize intercostal space

Front 5

Internal Intercostal
origin

Back 5

Inferior margin of superior rib

Front 6

Internal Intercostal
insertion

Back 6

Superior margin of inferior rib

Front 7

Internal Intercostal
innervation

Back 7

Intercostal nerves

Front 8

Internal Intercostal
action

Back 8

Depress ribs, stabilize intercostal space

Front 9

Innermost Intercostal
origin

Back 9

Inferior margin of superior rib

Front 10

Innermost Intercostal
insertion

Back 10

Superior margin of inferior rib

Front 11

Innermost Intercostal
innervation

Back 11

Intercostal nerves

Front 12

Innermost Intercostal
action

Back 12

Depress ribs, stabilize intercostal space (same as internal intercostal)

Front 13

Subcostal
origin

Back 13

Internal surface of rib (near angle)

Front 14

Subcostal
insertion

Back 14

Internal surface of 2nd-3rd rib inferior

Front 15

Subcostal
innervation

Back 15

Intercostal nerves

Front 16

Subcostal
action

Back 16

Depress ribs

Front 17

Transverse Thoracis
origin

Back 17

Internal surfaces of superior ribs

Front 18

Transverse Thoracis
insertion

Back 18

Internal surfaces of inferior sternum, adjacent costal cartilages

Front 19

Transverse Thoracis
innervation

Back 19

Intercostal nerves

Front 20

Transverse Thoracis
action

Back 20

Depress costal cartilages

Front 21

Diaphram
origin

Back 21

Margin of inferior thoracic aperture.

Crura attach to superior lumbar vertebrae

Front 22

Diaphram
insertion

Back 22

Central tendon of diaphram

Front 23

Diaphram
innervation

Back 23

Left and right phrenic nerves to respective domes (c3-c5)
"c3-4-5 keep the diaphram alive

Front 24

Diaphram
action

Back 24

Increase volume of thoracic cavity for inspiration.

Front 25

External Oblique
origin

Back 25

Outer surfaces of lower eight ribs

Front 26

External Oblique
insertion

Back 26

Iliac crest (lateral lip)
Linea alba

Front 27

External Oblique
innervation

Back 27

Anterior rami of thoracic spinal nerves

Front 28

External Oblique
action

Back 28

Unilateral: bends trunk to same side (turning anterior part of abdomen to opposite side)
Bilateral: flex trunk

Front 29

Internal Oblique
origin

Back 29

Iliac crest
Inguinal ligament

Front 30

Internal Oblique
insertion

Back 30

Lower 3-4 ribs
Linea alba

Front 31

Internal Oblique
innervation

Back 31

Anterior rami of Lower thoracic and L1 spine nerves

Front 32

Internal Oblique
action

Back 32

Unilateral: bends trunk to same side (turning anterior part of abdomen to same side)
Bilateral: flex trunk

Front 33

Transversus Abdominis
origin

Back 33

Iliac crest
Inguinal ligament

Front 34

Transversus Abdominis
insertion

Back 34

Pubic crest
Pectineal line
Linea alba

Front 35

Transversus Abdominis
innervation

Back 35

Anterior rami of lower thoracic and L1 spinal nerves

Front 36

Transversus Abdominis
action

Back 36

Compress abdominal contents

Front 37

Rectus Abdominis
origin

Back 37

Pubic crest
Pubic tubercle
Pubic symphysis

Front 38

Rectus Abdominis
insertion

Back 38

Costal cartilages of 5th -7th ribs

Front 39

Rectus Abdominis
innervation

Back 39

Anterior rami of Lower thoracic

Front 40

Rectus Abdominis
action

Back 40

Flexes vertebral column
Tenses abdominal wall