Axial Muscles

Origin, insertion, action

What is the action of buccinator

compress cheek

What is the action of orbicularis oris

close and purse lips

What is the action of orbicularis oculi

close eye lids

What is the action of risorius

draw corners of mouth laterally

What is the origin of zygomaticus major

zygomatic bone

What is the action of zygomaticus major

elevate corner of mouth (smile!)

What is the origin of zygomaticus minor

zygomatic bone

What is the action of zygomaticus minor

elevate upper lip

What is the action of platysma

depress mandible

What is the action of occipitofrontalis

elevate eyebrows (wrinkle forehead)

What is the action of corrugator supercili

pulls skin inferiorly and medially to wrinkle brow

What is the insertion of corrugator supercili

eyebrow

What is the action of depressor anguli oris

depress and draw corner of mouth laterally

What is the origin of masseter

zygomatic arch

What is the insertion of masseter

angle and ramus of mandible

What is the action of masseter

elevate mandible

What is the origin of temporalis

temporal fossa

What is the insertion of tenporalis

coronoid process mandible

What is the action of temporalis

elevate mandible

What is the origin of lateral pterygoid

lateral pterygoid process

What is the insertion of lateral pterygoid

mandibular condyle

What is the action of lateral pterygoid

anterior and side to side movement of mandible

What is the origin of medial pterygoid

medial pterygoid process

What is the insertion of medial pterygoid

medial surface of mandible at angle

What is the action of medial pterygoid

anterior and side to side movement of mandible

What is the origin of sternocleidomastoid

manubrium and medial clavicle

What is the insertion of sternocleidomastoid

mastoid process

What is the action of sternocleidomastoid

flexion, lateral flexion and rotation of neck

What is the origin of external intercostals

inferior border of rib above

What is the insertion of external intercostals

superior border of rib below

What is the action of external intercostals

elevate ribs (inhale)

What is the origin of internal intercostals

superior border of ribs below

What is the insertion of internal intercostals

inferior border of ribs above

What is the action of internal intercostal

depress ribs (exhale)

What is the insertion of diaphragm

central tendon

What is the action of diaphragm

change volume of thoracic cavity (primary mover for inhalation)

What is the origin of rectuc abdominis

pubic crest and symphysis

What is the insertion of rectus abdominis

xiphoid process, costal cartilage of ribs 5-7

What is the action of rectus abdominis

compress abdominal wall, flex vertebral column

What is the origin of transverse abdominis

inguinal ligament, iliac crest

What is the insertion of transverse abdominis

linea alba and pubic crest

What is the action of transverse abdominis

compress abdominal wall

What is the origin of external oblique

lower 8 ribs

What is the insertion of extenral obliques

linea alba and iliac crest

What is the action of external oblique

compress abdominal wall, trunk rotation, lateral flexion of lumbar vertebrae

What is the origin of internal oblique

inguinal ligament, iliac crest

What is the insertion of internal oblique

linea alba and cartilage of last 3 ribs

What is the action of internal oblique

compress abdominal wall, trunk rotation, lateral flexion of lumbar vertebrae

What is the action of erector spinae group

extension and lateral flexion of vertebral column, postural muscles

What is the origin of quadratus lumborum

iliac crest and iliolumbar ligaments

What is the insertion of quadratus lumborum

last rib and transverse process of lumbar vertabrae

What is the action of quadratus lumborum

lateral flexion of spine, depress ribs

What is the insertion of iliopsoas

common tendon

What is the origin of iliacus

iliac foss

What is the insertion of iliacus

lesser trochanter of femur

What is the action of iliacus

flexion of vertebral column and hip

What is the origin of psoas major

T12-L5

What is the insertion of psoas major

lesser trochanter of femur

What is the action of psoas major

flexion of vertebral column and hip