MUSCLES OF THE FACE
There are many muscles in changing facial expression and
with movement of lower jaw during chewing and speaking. Some of the main
muscles are present in pairs,one on each side.
1.
OCCIPITOFRONTALIS
(UNPAIRED)
This consists of a posterior muscle part over the occipital bone (occipitalis), an anterior part over the frontal bone (frontalis) and an extensive flat tendon or aponeurosis that stretches over the dome of the skull and joints the muscular parts .
it raises the eyebrows.
2.
LEVATOR PALPEBRAE
SUPERIORIS .
This muscle extends from the posterior part
of the orbital cavity to the upper eyelid.
It raises the eyelid.
3.
ORBICULARIS
OCULI.
This flat muscle of the cheek draws the
cheeks in towards the teeth in chewing and in forcible expulsion of air from
the mouth (the trumpeter’s muscle).
4.
ORBICULARIS ORIS
(UNPAIRED)
This muscle surrounds the mouth and blends
with the muscles of the cheeks. It closes the lips and , when strongly
contracted,shapes the mouth for whistling.
5.
MASSETER
This muscle is a broad muscle, extending
from the zygomatic arch to the angle of the jaw.
In chewing it draws the mandible up to the
maxilla, closing the jaw, and exerts considerable pressure on the food.
6.
TEMPORALIS
This muscle covers the squamous part of the
temporal bone.
It passes behind the zygomatic arch to be
inserted into the coronoid process of the mandible.
It closes the mouth and assists with
chewing.
7.
PTERYGOID
This muscle extends from the sphenoid bone
to the mandible.
It closes the mouth and pulls the lower jaw
forward.
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