Muscles of the Face
Summary
TLDRThis video delves into the intricate world of facial muscles, focusing on three main groups: sphincters like the orbicularis oculi and oris, muscles of facial expression including levator labii superioris, depressor labii inferioris, mentalis, zygomaticus minor and major, and triangularis, which control various expressions from smiling to frowning. It also touches on muscles of mastication, such as the masseter and temporalis, which are crucial for chewing. The video promises a separate exploration of muscles of the hyoid and neck, inviting viewers to continue their anatomical journey.
Takeaways
- π The video discusses the muscles of the face, specifically focusing on muscles of facial expression, mastication, and facial sphincters.
- π The orbicularis oculi is a sphincter muscle that closes the eye, while the orbicularis oris presses the lips together.
- π The nasalis muscle is not a true sphincter but functions to close the nostrils when depressed.
- π The levator labii superioris elevates the upper lip, and the depressor labii inferioris depresses the lower lip.
- π The mentalis muscle, also known as the pout muscle, protrudes the lower lip.
- π The zygomaticus minor and major are involved in smiling by pulling the corners of the mouth upwards and at an angle.
- π The triangularis muscle is responsible for frowning, as it pulls the corners of the mouth downwards and laterally.
- π¦· The muscles of mastication include the masseter, which elevates the mandible when it contracts.
- π The buccinator muscle does not move the jawbone but compresses the cheeks during chewing.
- π The temporalis muscle is a synergist with the masseter, also elevating the mandible due to its attachment to the coronoid process.
- π The video will have a separate segment for muscles of the hyoid and neck, indicating further content on the topic.
Q & A
What are the main categories of facial muscles discussed in the video?
-The main categories discussed are the muscles of facial expression, the muscles of mastication, and the sphincters of the face.
What is the function of a sphincter muscle?
-A sphincter is a circular muscle that guards an opening.
Name the sphincter muscles mentioned in the video and their functions.
-The orbicularis oculi closes the eye, and the orbicularis oris presses the lips together.
Why is the nasalis not considered a true sphincter?
-The nasalis is not considered a true sphincter because it is not a completely circular muscle, although it does guard an opening by shutting off the nostrils when depressed.
What are the functions of the levator labii superioris and the depressor labii inferioris?
-The levator labii superioris elevates the upper lip, and the depressor labii inferioris depresses the lower lip.
Which muscle is referred to as the 'pout muscle' and what is its function?
-The mentalis is referred to as the 'pout muscle' because it protrudes the lower lip.
How do the zygomaticus minor and zygomaticus major contribute to facial expression?
-The zygomaticus minor and zygomaticus major assist in smiling by pulling the corners of the mouth upwards and at an angle.
What is the function of the triangularis muscle?
-The triangularis muscle is a frown muscle because it pulls the corners of the mouth downwards and at an angle.
Describe the role of the risorius muscle in facial expression.
-The risorius muscle pulls the corners of the mouth laterally.
Which muscles of mastication were mentioned, and what are their functions?
-The masseter and temporalis muscles were mentioned. The masseter elevates the mandible, and the temporalis also elevates the mandible, acting as a synergist with the masseter. The buccinator, while not moving the jawbone, compresses the cheeks.
What is mastication?
-Mastication means chewing, so any muscle involved in chewing can be called a muscle of mastication.
Outlines
π Facial Muscles and Expressions
This paragraph introduces the topic of facial muscles, focusing on those responsible for facial expressions and mastication. It defines a sphincter muscle and identifies the orbicularis oculi and oris, as well as the nasalis. It then discusses the muscles involved in facial expressions, such as the levator labii superioris, depressor labii inferioris, mentalis, zygomaticus minor and major, and triangularis. These muscles are responsible for various expressions like smiling and frowning. The paragraph also explains that these muscles move the skin rather than joints.
Mindmap
Keywords
π‘muscles of facial expression
π‘sphincter
π‘orbicularis oculi
π‘orbicularis oris
π‘nasalis
π‘levator labii superioris
π‘depressor labii inferioris
π‘zygomaticus major and minor
π‘mentalis
π‘masseter
π‘buccinator
π‘temporalis
Highlights
Introduction to the muscles of the face, specifically facial expression, mastication, and sphincters.
Definition of a sphincter: a circular muscle guarding an opening.
Orbicularis oculi closes the eye.
Orbicularis oris presses the lips together.
Nasalis muscle guards the nostrils but isn't a true sphincter.
Levator labii superioris elevates the upper lip.
Depressor labii inferioris depresses the lower lip.
Mentalis is known as the pout muscle because it protrudes the lower lip.
Zygomaticus minor and major assist in smiling by pulling the corner of the mouth upwards and at an angle.
Triangularis is a frown muscle because it pulls the corners of the mouth downwards and at an angle.
Risorius pulls the corners of the mouth laterally.
Facial expression muscles move the skin, not joints.
Muscles of mastication move the mandible, such as the masseter.
Masseter elevates the mandible, connected to the angle of the mandible and zygomatic bone.
Buccinator compresses the cheeks.
Temporalis elevates the mandible, similar to the masseter, and is considered a synergist with it.
Mastication refers to chewing, involving any muscle related to this action.
Conclusion and preview of next video on the muscles of the hyoid and neck.
Transcripts
hey everyone so in today's video I'm
gonna talk about the muscles of the face
specifically I'm gonna talk about the
muscles of facial expression the muscles
of mastication and the sphincters of the
face
so the definition of a sphincter is a
circular muscle which guards an opening
on the face there is the orbicularis
oculi which closes the eye and the
orbicularis Oris which presses the lips
together and there's also the nez alice
which isn't a true sphincter because
it's not a completely circular muscle
but it does guard an opening because it
kind of shuts off your nostrils when you
depress it moving on to the muscles of
facial expression
there's the levitt or lay-by superiores
and the depressor lay by inferiors
so the Leavitt or lay by superiores
elevates the upper lip and the depressor
lay by inferiority depresses the lower
lip on the chin is a muscle called the
mentalis which is the pout muscle
because it protrudes the lower lip the
zygomaticus minor and zygomaticus major
both assist in smiling because they pull
the corner of the mouth upwards and at
an angle and the triangularis is a frown
muscle because it pulls the corners of
the mouth downwards and at an angle
the resource it's hooked to the corner
of the mouth but you see it runs side to
side so it pulls the corners of the
mouth laterally so all of these muscles
are just moving skin they're not moving
a joint the muscles of mastication some
of them are actually moving a joint
because they're moving the mandible so
the masseter is hooked to the angle of
the mandible and the zygomatic bone so
when it contracts and pulls upwards it
elevates the mandible and the Bucks
inator
this one doesn't move the jawbone it
just compresses the cheeks
the temporalis also elevates the
mandible just like the masseter because
you see it's hooked here to the coronoid
process of the mandible and then it
pulls this way so when it does that it's
going to elevate the mandible so because
it has the same action as the masseter
we can say it's a synergist with the
masseter also when you hear muscles of
mastication mastication just means
chewing so any muscle that has to do
with chewing you can call a muscle of
mastication
so that's everything I'm gonna talk
about in this video I'm going to make a
separate video for the muscles of the
hyoid and the muscles of the neck have a
great day and have fun studying
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