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Origin, Action, Insertion of Axial Muscles

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jacksteines's version from 2017-02-22 23:41

Section 1

Question Answer
Action of occipitofrontalis frontal belly raises eyebrows, wrinkles forehead
Origin of occipitofrontalis frontal bellyEpicranaial apoenurosis
Insertion of occipitofrontalis frontal bellyskin of eyebrow and bridge of nose
Action of Orbicularis Oculicloses eye
Origin of Orbicularis OculiMedial margin of orbit
Insertion of Orbicularis OculiSkin around eyelids
memorize

Section 2

Question Answer
Action of Levator Labii Superioriselevates upper lip
Origin of Levator Labii Superiorisinferior margin of orbit
Insertion of Levator Labii SuperiorisOrbicularis oris
Action of Depressor Labii Inferiorisdepresses lower lip
Origin of Depressor Labii InferiorisMandible
Insertion of Depressor Labii Inferiorisskin of lower lip
memorize

Section 3

Question Answer
Action of Orbicularis Oriscompresses, purses lips
Origin of Orbicularis Orismaxilla and mandible
Insertion of Orbicularis Orislips
Action of mentaliselevates, everts, and protrudes lower lip (pouting)
Origin of mentalismandible
Insertion of mentalisskin of chin
memorize

Section 4

Question Answer
Action of Sternocleidomastoidbilaterally, flex neck unilaterally, laterally flex neck and turns face to opposite side
Origin of Sternocleidomastoidsternal end of clavicle and manubirum of sternum
Insertion of Sternocleidomastoid mastoid process of the temporal bone
Action of inferior rectuseye looks down
Origin of inferior rectussphenoid
Insertion of inferior rectusinferior surface
memorize

Section 5

Question Answer
Action of medial rectuseye looks medially
Origin of medial rectussphenoid
Insertion of medial rectusmedial surface
Action of superior rectuseye looks up
Origin of superior rectussphenoid
Insertion of superior rectussuperior surface
memorize

Section 6

Question Answer
Action of lateral rectuseye looks laterally
Origin of lateral rectussphenoid
Insertion of lateral rectuslateral surface
Action of inferior obliqueeye rolls, looks up and laterally
Origin of inferior obliquemaxilla
Insertion of inferior obliqueinferior/lateral surface
memorize

Section 7

Question Answer
Action of superior obliqueeye rolls, looks down and laterally
Origin of superior obliquesphenoid
Insertion of superior obliquesuperior/lateral surface
Action of zygomaticus majorelevates corner of mouth and draws it laterally
Origin of zygomaticus majorzygomatic bone
Insertion of zygomaticus majormuscles at angle of mouth
memorize

Section 8

Question Answer
Action of zygomaticus minorelevates upper lip
Origin of zygomaticus minorzygomatic bone
Insertion of zygomaticus minorupper lip
Action of temporaliselevates/closes jaw
Origin of temporalistemporal bone
Insertion of temporaliscoronoid process of mandible
memorize

Section 9

Question Answer
Action of masseterelevates mandible
Origin of masseterzygomatic arch
Insertion of masseterangle/ramus of mandible
Action of diaphragmWhen contracted, it flattens and increases vertical dimension of thoracic cavity for inhalation. When relaxed, it moves superiorly and decrease vertical dimension of cavity for exhalation.
Origin of diaphragmxiphod process of sternum/costal cartilage ribs/lumbar vertebrae and discs
Insertion of diaphragmcentral tendon (towards the center of diaphragm)
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Section 10

Question Answer
Action of external intercostalsWhen contracted, they elevate ribs and increase anteroposterior dimension of thoracic cavity for inhalation. When relaxed, they depress ribs and decrease dimension of cavity for exhalation.
Origin of external intercostalsinferior border of rib ABOVE
Insertion of external intercostalssuperior border of rib BELOW
Action of internal intercostalswhen contracted, draws adjacent ribs together to decrease dimensions of cavity during FORCED exhalation
Origin of internal intercostalssuperior border of rib BELOW
Insertion of internal intercostalsinferior border of rib ABOVE
memorize

Section 11

Question Answer
Action of rectus abdominusflexes vertebral column and compresses abdomen
Origin of rectus abdominuspubic crest/pubic symphysis of pubis/os coxa
Insertion of rectus abdominusribs 5-7/xiphoid process of sternum
Action of external oblique (abdomen)Acting together (bilaterally)-compress abdomen/flex vertebral column. Acting separately (unilaterally)-lateral flexion of vertebral column and rotates column to opposite side
Origin of external oblique (abdomen)ribs 5-12
Insertion of external oblique (abdomen)iliac crest of ilium/os coxa and lines alba (midline)
memorize

Section 12

Question Answer
Action of internal oblique (abdomen)Acting together (bilaterally)-compress abdomen/flex vertebral column. Acting separately (unilaterally)-lateral flexion of vertebral column and rotates column to same side.
Origin of internal oblique (abdomen)iliac crest of ilium/os coxa
Insertion of internal oblique (abdomen)ribs 9-12, linea alba, and costal cartilage 8-10
Action of transverse abdominiscompresses abdomen
Origin of transverse abdominisiliac crest of ilium/os coxa and ribs 5-10
Insertion of transverse abdominisxiphoid process of sternum, linea alba (midline) and pubis/os coxa
memorize

Section 13

Question Answer
Action of erector spinaeWhen contracting together (bilaterally)-they extend the vertebral column and maintain posture. When contracting separately (unilaterally)-they rotate and laterally flex the vertebral column.
Origin of erector spinaeLarge muscle group extending from sacrum to the base of the skull. They attach to the vertebrae and ribs along the way.
Insertion of erector spinaeLarge muscle group extending from sacrum to the base of the skull. The attach to the vertebrae and ribs along the way
memorize

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