Anterior Back Muscles Action, Orgin, Insertion, Innervations

Sternocliedomastoid purposeful activity

Watching an athletic event, socializing, driving

Sternocleidomastoid orgin

Sternal head: manubrium

Clavicular head: Medial clavicle

sternocleidomastoid insertion

mastoid process of temporal bone

Sternocleidomastoid action

Bilateral: Flex the neck Assist to elevate the rib cage during

inhalation; Unilateral: lateral flexion, contralateral rotation

Sternocleidomastoid innervation

spinal accessory nerve (CN XI)

scalene purposeful activity

Driving, deep breathing with exertion (running, cycling)

scalene orgin

Cervical transverse processes

scalenes insertion

1st rib (anterior and middle) 2nd rib (posterior)

scalenes action

Bilateral: Elevate the ribs during inhalation

Unilateral: Laterally flex

external oblique purposeful activity

Bed mobility, lifting (increasing intra-abdominal pressure to stabilize lumbar spine)

external oblique origin

lower ribs

external oblique insertion

IliacIliac crest, linea alba, pubic tubercle

external oblique action

Bilateral: Compress abdomen, stabilize spine, flex trunk, posterior pelvic tilt

Unilateral: lateral flexion, contralateral

rotation.

Internal oblique purposeful activity

Bed mobility, playing a racket sport (trunk rotation), lifting (increasing intra-abdominal pressure to stabilize lumbar spine

internal oblique orgin

Thoracolumbar fascia; iliac crest, inguinal ligamen

internal oblique insertion

lower ribs, lines alba, pubic crest

internal oblique actions

Compress abdomen, stabilize spine, flex trunk, posterior pelvic tilt.

Unilateral: lateral flexion, ipsilateral rotation.

transverse abdominis purposeful activity

Carrying a child or pet (increasing intra-abdominal pressure to stabilize lumbar spine)

transverse abdominis orgin

Thoracolumbar fascia, iliac crest; inguinal ligament; lower ribs

transverse abdominis insertion

Linea alba; pubic crest

transverse abdominis action

Compress abdomen, stabilize spine

rectus abdominis purposeful activity

Lower body dressing, bed mobility (supine to sit

rectus abdominis origin

Pubic crest, pubic tubercle, pubic symphysis

rectus abdominis insertion

lower ribs, xiphoid process

rectus abdominis action

Compress abdomen, flex trunk, posterior pelvic tilt

diaphragm purposeful movement

Singing, playing a trumpet (deep breathing)

diaphragm orgin

Lower ribs, upper lumbar vertebrae, xiphoid process

diaphragm insertion

central tendon

diaphragm action

Draw down the central tendon of the diaphragm; Increase the volume of the thoracic cavity during inhalation

diaphragm innervation

phrenic nerve C3-C5

intercostal purposeful activity

Singing, playing the trumpet (deep breathing)

intercostal orgin

rib

intercostal insertion

rib

intercostals action

Move ribs to assist with breathing

intercostal innervation

intercostal nerves