MUSCLES : HEAD

MUSCLES : HEAD

1. EXPRESSION

   • VARIOUS INTRINSIC MUSCLES
     • they adjust to control the.. -Lips -Nostrils -Eyelids -Ears -whiskers to show expression

2. MASTICATION

   • MASSETER
     • Origin: Zygomatic arch Insertion: lateral side of the mandible  Action: helps to close the jaw
   • TEMPORAL
     • Origin: Temporal fossa Insertion: Medial side of the coronoid process (the muscle that lines the temporal fossa) Action: Helps close the jaw
   • LATERAL PTERYGOIDS
     • Action: Moves the jaw from side to side
   • MEDIAL PTERYGOIDS
     • Action: Moves the jaw from side to side
   • DIGASTRICUS
     • helps the jaw open

3. THE EYES

   • MEDIAL,LATERAL, DORSAL & VENTRAL RECTUS
     • Helps move the eye up, down, and side to side
   • RETRACTOR OCULI
     • Helps move the eye up, down, and side to side
   • DORSAL AND VENTRAL OBLIQUE
     • Helps move the eye up, down, and side to side

4. THE TONGUE, PHARYNX & LARYNX

   • -Allow respiration, swallowing and voice production.
   • INTRINSIC MUSCLES
     • Allow the tongue to curl up, flatten and move side to side.
   • EXTRINSIC MUSCLES
     • Cause the tongue to move back, forth and upwards.

5. THE HEAD

   • These move the head in relation to the rest of the body.