Muscles of Facial Expression - Functional Anatomy

These muscles function as sphincters and dilators around facial orifices. Since they are attached to the skin, they move the skin producing a variety of facial expressions essential for nonverbal communication. Additionally, they contribute to vital functions such as eating, speaking, and protecting the eyes.

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0:00 Introduction
0:21 Differentiate between the muscles of facial expression and the muscles of mastication
1:25 Embryology
2:54 Orbicularis oculi: Controls eyelid movements and is essential for blinking and forceful eye closure.
5:38 Occipitofrontalis: the frontal belly elevates the eyebrows, causing horizontal forehead wrinkles associated with surprise or worry.
7:50 Depressor supercilii
8:14 Procerus
8:59 Corrugator Supercilii: Draws the eyebrows downward and medially, creating vertical forehead wrinkles typical of frowning.
10:31 Orbicularis oris: Encircles the mouth, enabling lip closure and movements such as kissing.
11:20 and 11:43 Zygomaticus major and minor: Aid in smiling, with the major muscle responsible for cheek dimples.
11:52 Levator Labii Superioris
12:01 Levator Labii Superioris Alaeque Nasi: elevates the upper lip and has the additional function of flaring the nostrils
12:27 Levator Anguli Oris
13:35 Depressor Anguli Oris: pulls the angle of the mouth downward, contributing to expressions like frowning or sadness.
13:55 Depressor Labii Inferioris: depresses the lower lip, aiding in expressions like sadness or doubt.
14:18 Mentalis: Located in the chin, it helps pout and protrude the lower lip.
15:27 Buccinator: Aids in chewing by pushing food toward the teeth and is crucial for actions like blowing and sucking.
17:49 Risorius: Pulls the angle of the mouth laterally, contributing to expressions like smiling or grinning.
18:21 Platysma: Extends from the chest to the lower face, depressing the lower lip and angle of the mouth and aiding in expressions like frowning.
19:28 Nasalis: Adjusts nostril size, with its transverse and alar parts contributing to nostril compression and dilation.

After watching this video you should be able to answer the following questions
1. Explain why dysfunction of orbicularis oculi can cause tear overflow. 4:06
2. Which muscle is often targeted with Botox to reduce crow's feet? 4:35
3. What is the aesthetic implication of weak levator palpebrae superioris muscle? 5:06
4. Explain the role of the frontalis muscle in forehead aesthetics? 7:19
5. Which muscle mainly contributes to the vertical frown lines between the eyebrows? 8:59
6. Dysfunction of which muscle can lead to difficulties in pronouncing bilabial sounds like "b," "p," and "m"? 10:31
7. Excessive contraction of which muscle mainly contributes to a "gummy smile"? 13:07
8. Why might a patient with facial nerve paralysis exhibit an asymmetrical smile, and which muscles are involved? 10:51
9. What aesthetic issues can arise from an overactive depressor anguli oris muscle? 14:09
10. What is the clinical significance of the buccinator muscle to oral health and dental procedures? 16:51
11. Describe the potential aesthetic concerns of hyperactive mentalis muscle? 14:18
12. How can Botox treat bunny lines, and which muscle is involved? 20:07

Presented and edited by Akram Jaffar, M.B;Ch.B, Ph.D.
Cinematography: Tamara Harvey

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[Thefable]

وفقك الله ياأستاذنا شرحك جميل ورائع وقناتك مميزة منذ بداياتها وقد استفدت منها الكثير ❤

[LaDeeDah]

This is great! Im a licensed skincare therapist and had to learn about the facial musles in school but its been 9 years so its wonderful to refresh my learning with such a great model!
Can I purchase from the Anatomy Warehouse as a licensed skincare therapist?

[LaDeeDah]

Can you tell me what would cause 'lumps' or nodules, or portrusion on eyebrows where the frontalis and orbicularis oculi meet?