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Thursday, September 2, 2010

Skull and Facial Muscles

  • Frontalis muscle
Origin:
          Epicranial aponeurosis

Insertion:
          Supra orbital margin

Function:
          Raises the upper eyelids, and wrinkles the skin of the forehead

  • Occipitalis muscle
Origin:
          Posterior margin of the occipital bone and mastoid process of temporal bone

Insertion:
          Epicranial aponeurosis

Function:
          Draws skin of the scalp backward

Facial Muscles

  • Orbicularis oris muscle
Origin:
          Upper and lower margins of lips

Insertion:
          Angle of the mouth

Function:
          Closes the mouth

  • Orbicularis oculi muscle
Origin:
          Upper and lower margins of the orbit

Insertion:
          Angle of the orbits

Function:
          Closes the eye

  • Zygomatic major muscle
Origin:
          Zygomatic bone

Insertion:
          Angle of the mouth

Function:
          Raises the upper lip

  • Zygomatic minor muscle
Origin:
          Zygomatic bone

Insertion:
          Lower lip

Function:
          Depression of lower lip

  • Levator labii superioris muscle
Origin:
          Upper lip

Insertion:
          Angle of the mouth

Function:
          Raises the upper lip

  • Depressor labii inferioris muscle
Origin:
          Lower lip

Insertion:
          Angle of the mouth

Function:
          Depression of lower lip

  • Levator palpebrii superioris muscle
Origin:
          Roof of the orbit and lesser wing of the sphenoid bone

Insertion:
          Skin of the superior eyelid

Function:
          Elevates the upper eyelid

  • Buccinator muscle
Origin:
          Alveolar processes of maxillae and mandible

Insertion:
          Upper and lower lips

Function:
          Approximation of upper and lower lips as in ‘whistling’

  • Risorius muscle
Origin:
          Fascia over the parotid gland

Insertion:
          Lower lip

Function:
            Draw the mouth backward

  • Mentalis muscle
Origin:
          Angle of mandible

Insertion:
          Mental foramen

Function:
          Movement of mandible

  • Corrigurator supercilli muscle
Origin:
          Medial side of supra orbital margin

Insertion:
          Eyebrow

Function:
          Movement of eyebrow

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