Muscles of Mastication – Jaw And Mandible – Face Anatomy part 3

Muscles of Mastication – Jaw And Mandible – Face Anatomy part 3

My name is Fahrice this is Animated
Anatomy. In this video I will talk about the muscles of mastication. There’s not
much to make the introduction about so let’s just start with it. There are four classical muscles of
mastication, three of these do the adduction, while only one does the
abduction. The first muscle that I’ll talk about is the temporalis muscle.
The temporalis muscle arises from the temporal fossa and on the other side i
removed other muscles so we can see it better. It passes medial to the zygomatic arch
and forms a tendo which inserts onto the coronoid process of the mandible. This is
the strongest mastication muscle and it can be divided into two functional parts
the anterior one and the posterior one. The anterior part elevates the mandible
and the contraction of the posterior part results in the retrusion of the
mandible. Here you can see the blood supply of the muscle and this is a aorta
while this is common carotid artery which later gives off the external
carotid artery, up there you have the maxillary artery and finally arteries
that give blood to the muscle the deep temporal arteries. Here we can zoom in a
little bit to see from the closer perspective. Now if we look at the
trigeminal nerve or here we can see that it gives off a branch and that is the
mandibular branch of the trigeminal nerve and that’s the branch that
innervates the temporalis muscle. The second muscle of mastication that I want
to talk about is this over here, this is the masseter muscle. The masseter does the elevation just like
the temporalis muscle but additionally to that it also does the
protraction of the mandible. This muscle is also innervated by the mandible
nerve and it gets the blood from the axillary artery which comes from the
external carotid artery. The next muscle that gets its blood from the maxillary
artery is this muscle over here and that is also the muscles of mastication the
medial pterygoid, it is innervated by the mandibular nerve and the muscle
has a minor contribution than the protrusion of the mandible and it also elevates the
mandible. If you remove this muscle we can see the fourth muscle of the
mastication and that is this muscle here with two heads the lateral pterygoid
muscle, because of a specific location of its origin and its insertion this muscle
is the only muscle of mastication that assist the depression of mandible. This here is the superior head of the
lateral pterygoid, the superior head originates on the infratemporal surface
and infratemporal crest of the greater wing of the sphenoid bone. The inferior
head originates on the lateral surface of the lateral pterygoid to plate of the
sphenoid bone, but these four muscles are not the only four muscles that help you
to chew the food. If i remove some of these muscles here you will be able to see
this one over here and that is the Buccinator muscle. The Buccinator muscle
if you look at it from the anterior point of view, it’s basically making the
cheek inner surface touch the teeth and that way the Buccinator pushes the food
between the teeth so it can be chewed . So now you know a lot of muscles
mastication.In my next video I will talk about the eye anatomy and you can watch
that video here, you can also watch my previous video here, if you like my
lessons they want to purchase my software you can go to my website If you don’t want to purchase it,
at least you can subscribe here for new free content that I release regularly
on my channel. Thank you.

13 Replies to “Muscles of Mastication – Jaw And Mandible – Face Anatomy part 3”

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