Axial Skeleton- Origin and Insertions
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44 Terms
Where does trapezius originate?
external occipital protuberance and superior nuchal line
Where does trapezius insert?
clavicle (lateral 1/3), acromion process of scapula, and spine of scapula
What action does the upper fibers of trapezius do?
extension, lateral flexion, and contralateral rotation of neck
Where does sternocleidomastoid originate?
manubrium of sternum and clavicle
Where does sternocleidomastoid insert?
mastoid process of temporal bone
What action does the sternocleidomastoid do?
flexion, lateral flexion, contralateral rotation of neck and inspiration
Where does anterior scalene originate?
transverse process of cervical spine
Where does anterior scalene insert?
rib 1
What action does anterior scalene do?
flexion of the neck
Where does middle scalene originate?
transverse process of cervical vertebrae
Where does middle scalene insert?
rib 1
What action does middle scalene do?
lateral flexion of the neck
Where does posterior scalene originate?
transverse process of cervical vertebrae
Where does posterior scalene insert?
rib 2
What action does posterior scalene do?
lateral flexion of the neck
Where does temporalis originate?
temporal lines
Where does temporalis insert?
coronoid process of mandible
What action does temporalis do?
closes and pulls jaw posteriorly
Where does masseter originate?
zygomatic arch
Where does masseter insert?
lateral surface of ramus and angle of mandible
What action does masseter do?
closes pulls jaw to same side
Where does lateral pterygoid originate?
lateral surface of lateral pterygoid plate
Where does lateral pterygoid insert?
condyle of mandible at the neck
What action does lateral pterygoid do?
closes, pulls anteriorly, and moves the jaw opposite sides
Where does medial pterygoid originate?
medial surface of lateral pterygoid plate
Where does medial pterygoid insert?
angle of mandible on the medial surface
What action does medial pterygoid do?
closes and pulls jaw to opposite side
What are the tongue muscles?
genioglossus, hyoglossus, styloglossus, and palatoglossus
What are the suprahyoid muscles?
digastric, mylohyoid, geniohyoid, and stylohyoid
What are the infrahyoid muscles?
sternohyoid, omohyoid, sternothyroid, and thyrohyoid
What does the suprahyoid muscle do?
assists in chewing and swallowing
What do the infrahyoid muscles do?
assists in chewing and swallowing
What action does the external intercostals do?
elevate ribs during inspiration
What action does the internal intercostals do?
depress ribs during forced expiration
What action does the transverse thoracis do?
depress ribs for expiration
What action does the diaphragm do?
inspiration
Where does rectus abdominis originate?
crest of pubis and pubic symphysis
Where does rectus abdominis insert?
xiphoid process
Where does external abdominal oblique originate?
external surface of ribs 5-12
Where does external abdominal oblique insert?
anterior iliac crest and linea alba
Where does internal abdominal oblique originate?
anterior iliac crest
Where does internal abdominal oblique insert?
inferior border of ribs 10-12
Where does transversus abdominis originate?
internal border of ribs 7-12
Where does transversus abdominis insert?
pubic crest and linea alba