KAAP 230 - Axial muscles (head, neck, back, thorax, abdomen) origin, insertion, & primary action(s)

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Last updated 5:42 PM on 9/21/26
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30 Terms

1
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elevation of eyebrows

creases skin of forehead

moves scalp backward & forward

action of occipitofrontalis

<p>action of occipitofrontalis</p>
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closes eyelids (blink/wink)

action of orbicularis oculi

<p>action of orbicularis oculi</p>
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closes lips/protrudes lips (pucker)

action of orbicularis oris

<p>action of orbicularis oris</p>
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elevation of mandible (closing mouth)

protraction of mandible

action of masseter

<p>action of masseter</p>
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elevation of mandible (closing mouth)

retraction of mandible

action of temporalis

<p>action of temporalis</p>
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clavicle (medial)

sternum

origin of sternocleidomastoid

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mastoid process of temporal bone

lateral one-half of superior nuchal line of occipital bone

insertion of sternocleidomastoid

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unilateral - rotation of head so face turns to opposite side

bilateral - flexion of neck

bilateral - extension of head

action of sternocleidomastoid (unilateral, bilateral, bilateral)

<p>action of sternocleidomastoid (unilateral, bilateral, bilateral)</p>
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upper : occipital bone

middle : cervical & thoracic V

lower : lower thoracic V

origin of trapezius (upper, middle, lower)

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upper : clavicle and acromion

middle : spine of scapula

lower : base of spine of scapula

insertion of trapezius (upper, middle, lower)

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upper : elevation and upward rotation

middle : retraction

lower : depression and upward rotation

action of trapezius (upper, middle, lower)

<p>action of trapezius (upper, middle, lower)</p>
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T2-T5

origin of rhomboid major

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medial border of scapula

insertion of rhomboid major

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scapular retraction

action of rhomboid major

<p>action of rhomboid major</p>
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C7-T1, ligamentum nuchae

origin of rhomboid minor

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medial border of scapula

insertion of rhomboid minor

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scapular retraction

action of rhomboid minor

<p>action of rhomboid minor</p>
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compresses teeth against cheek & gums

retracts cheek

action of buccinator

<p>action of buccinator</p>
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L/S (lumbar & sacrum) extension

ipsilateral lateral flexion

fixes rib 12

stabilizes diaphragm

action of quadratus lumborum

<p>action of quadratus lumborum</p>
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forward flexion (pair)

ipsilateral lateral flexion

contralateral rotation

action of external oblique

<p>action of external oblique</p>
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forward flexion (pair)

ipsilateral lateral flexion

ipsilateral rotation

action of internal oblique

<p>action of internal oblique</p>
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forward flexion

action of rectus abdominus

<p>action of rectus abdominus</p>
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compresses abdominal cavity

action of transverse abdominus

<p>action of transverse abdominus</p>
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ribs 1-8

origin of serratus anterior

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medial border of scapula

insertion of serratus anterior

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scapular protraction

action of serratus anterior

<p>action of serratus anterior</p>
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ribs 3-5

origin of pectoralis minor

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scapula (coracoid process)

insertion of pectoralis minor

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stabilizes scapula

protraction (abduction) of scapula

lateral rotation of scapula

action of pectoralis minor

<p>action of pectoralis minor</p>
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contracts and flattens

inspiration/inhalation

action of diaphragm