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A&P 2
Muscles of the Neck
| Muscle Property | Value |
|---|---|
| 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 |