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A&P 2

Muscles of the Neck

Muscle PropertyValue
Sternocleidomastoid: Origin Sternum & Clavicle
Sternocleidomastoid: Insertion Mastoid process
Sternocleidomastoid: Action extension, flexion, stabilization of spine
Platysma: Origin Fascia of upper one fourth of chest
Platysma: Insertion Mandible
Platysma: Action Depresses and draws lower lip laterally, draws up skin of chest, depresses mandible
Longus Colli: Origin- Superior Third, fourth, and fifth cervical vertebrae
Longus Colli: Insertion- Superior Altas
Longus Colli: Origin- Inferior First two or three thoracic vertebrae
Longus Colli: Insertion- Inferior Fifth and sixth cervical vertebrae
Longus Colli: Origin- Vertical Upper three thoracic and lower three cervical vertebrae
Longus Colli: Insertion- Vertical Second, third, and fourth cervical vertebrae
Longus Colli: Action All three parts flex cervical vertebrae
Longus Capitis: Origin Third through sixth cervical vertebrae
Longus Capitis: Insertion Occipital bone
Longus Capitis: Action Acting together- flexes head. Acting on one side- Rotates head.
Rectus Capitis Anterior: Origin Atlas
Longus Capitis Anterior: Insertion Occipital bone
Longus Capitis Anterior: Action Flexes head
Rectus Capitis Lateralis: Origin Atlas
Rectus Capitis Lateralis: Insertion Occipital bone
Rectus Capitis Lateralis: Action Bends head laterally
Scalenus Anterior: Origin Third through sixth cervical vertebrae
Scalenus Anterior: Insertion First rib
Scalenus Anterior: Action Raises first rib; acting together, they flex neck; acting on one side, they laterally flex, rotate neck
Scalenus Medius: Origin Lower six cervical vertebrae
Scalenus Medius: Insertion First rib
Scalenus Medius: Action Raises first rib; acting together, they flex neck; acting on one side, they laterally flex, rotate neck
Scalenus Posterior: Origin Lower two or three cervical vertebrae
Scalenus Posterior: Insertion Second rib
Scalenus Posterior: Action Raises second rib; acting together, they flex neck; acting on one side, they laterally flex, rotate neck
Rectus Capitis Posterior Major: Origin Axis
Rectus Capitis Posterior Major: Insertion Occipital bone
Rectus Capitis Posterior Major: Action Extends and rotates head
Rectus Capitis Posterior Minor: Origin Atlas
Rectus Capitis Posterior Minor: Insertion Occipital bone
Rectus Capitis Posterior Minor: Action Extends head
Obliquus Capitis Inferior: Origin Axis
Obliquus Capitis Inferior: Insertion Atlas
Obliquus Capitis Inferior: Action Rotates atlas
Obliquus Capitis Superior: Origin Atlas
Obliquus Capitis Superior: Insertion Occipital bone
Obliquus Capitis Superior: Action Extends and bends head laterally
Created by: countessvenus