Zygomaticus major muscle

From WikiMD.com - Food, Medicine & Wellness Encyclopedia

Zygomaticus Major Muscle

The Zygomaticus Major Muscle is a facial muscle that plays a crucial role in the expression of emotions, particularly in smiling and laughing. Originating from the zygomatic bone, it extends downwards and medially, inserting into the corners of the mouth. This muscle is innervated by the facial nerve (Cranial Nerve VII), allowing for voluntary and involuntary movements associated with facial expressions.

Anatomy[edit | edit source]

The Zygomaticus Major Muscle originates from the lateral aspect of the Zygomatic Bone, just below the zygomatico-orbital foramen. It travels obliquely downward and medially, passing over the Zygomaticus Minor Muscle when present, and inserts into the skin and muscle at the corner of the mouth, blending with fibers of the Orbicularis Oris Muscle.

Function[edit | edit source]

The primary function of the Zygomaticus Major is to elevate and draw the angle of the mouth superiorly and laterally. This action is predominantly seen during smiling and laughing, making it an essential muscle for facial expressions of joy and happiness. Through its contraction, the Zygomaticus Major pulls the upper lip upwards and outwards, creating the characteristic smile.

Innervation[edit | edit source]

The Zygomaticus Major is innervated by the buccal branch of the Facial Nerve (Cranial Nerve VII). This nerve provides the motor innervation necessary for the muscle to contract and perform its function in facial expression.

Clinical Significance[edit | edit source]

Damage to the Facial Nerve can result in paralysis of the Zygomaticus Major Muscle, leading to a loss of the ability to smile on the affected side of the face. This condition is often seen in Bell's Palsy, a temporary paralysis of the facial muscles. Additionally, cosmetic procedures and surgeries involving the face may target or affect the Zygomaticus Major due to its role in facial expressions.

See Also[edit | edit source]

References[edit | edit source]


Stub icon
   This article is a medical stub. You can help WikiMD by expanding it!



WikiMD
Navigation: Wellness - Encyclopedia - Health topics - Disease Index‏‎ - Drugs - World Directory - Gray's Anatomy - Keto diet - Recipes

Transform your life with W8MD's budget GLP1 injections in NYC from $125 and up biweekly

W8mdlogo.png
W8MD weight loss doctors team

W8MD offers a medical weight loss program NYC and a clinic to lose weight in Philadelphia. Our W8MD's physician supervised medical weight loss centers in NYC provides expert medical guidance, and offers telemedicine options for convenience.

Why choose W8MD?

Book Your Appointment

Start your NYC weight loss journey today at our NYC medical weight loss, and Philadelphia and visit Philadelphia medical weight loss Call (718)946-5500 for NY and 215 676 2334 for PA

Search WikiMD

Ad.Tired of being Overweight? Try W8MD's NYC physician weight loss.
Semaglutide (Ozempic / Wegovy and Tirzepatide (Mounjaro / Zepbound) available. Call 718 946 5500.
Advertise on WikiMD

WikiMD's Wellness Encyclopedia

Let Food Be Thy Medicine
Medicine Thy Food - Hippocrates

Medical Disclaimer: WikiMD is not a substitute for professional medical advice. The information on WikiMD is provided as an information resource only, may be incorrect, outdated or misleading, and is not to be used or relied on for any diagnostic or treatment purposes. Please consult your health care provider before making any healthcare decisions or for guidance about a specific medical condition. WikiMD expressly disclaims responsibility, and shall have no liability, for any damages, loss, injury, or liability whatsoever suffered as a result of your reliance on the information contained in this site. By visiting this site you agree to the foregoing terms and conditions, which may from time to time be changed or supplemented by WikiMD. If you do not agree to the foregoing terms and conditions, you should not enter or use this site. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates, categories Wikipedia, licensed under CC BY SA or similar.

Contributors: Prab R. Tumpati, MD