zygomaticus major and minor

Zygomaticus minor is a direct tractor of the upper lip, together with levator labii superioris alaeque nasi and levator labii superioris. Zygomaticus major muscle: want to learn more about it? All rights reserved. Smile!

It attaches to the skin of the middle section of the nasolabial furrow as well as into the cheek fat. It draws the middle portion of the nasolabial furrow along with the middle portion of one side of the upper lip outward as well as slightly upward. General information. – For questions regarding business inquiries. Because of the connection of the cheekbone and eye socket and jaw, eye or mouth pain may be experienced too. Upon activation the zygomaticus minor pulls the upper lip backward, upward and outward, and also aids in deepening and elevating the nasolabial sulcus. Copyright © For example, orbital processes exist in the zygomatic, palatine, maxilla, and frontal bones. 2020 It innervates muscles under the orbit and around the mouth. The zygomatic nerve branches to form the zygomaticotemporal and zygomaticofacial nerves – each nerve exits from its similarly-named foramen: The buccal branch  of the facial nerve (not the buccal nerve) is also associated with zygomatic bone function. A zygomaticomaxillary complex fracture (ZCM fracture) accounts for around 40% of midface fractures. Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). They are important contributors to mastication or chewing, providing an attachment point for the masseter muscle – a jaw adductor that closes the jaw. All these muscles work together to control the shape, posture and movements of the lips. This article will discuss the anatomy and function of zygomaticus minor muscle.

Along with risorius, zygomaticus major contributes to laughing, which is why they are deemed the “laughing muscles”.

It originates from the malar bone and continues along with the orbicularis oculi found on the lateral face for the levator labii superioris.

Boca Raton, FL: CRC Press, Taylor & Francis Group. Facial artery supplies both zygomaticus major and minor muscles. It is not entirely clear which muscles exactly attach to the modiolus, but some of the certain ones include depressor anguli oris, buccinator, risorius, zygomaticus major and orbicularis oris muscles. Please contact: ) that lie next to each other in the cheek area. Kim Bengochea, Regis University, Denver, Author: Kenhub. Zygomaticus minor lies deep to the subcutaneous fat of the face and superficial to the levator anguli oris muscle. The zygomaticus major directs the motion of upper lip outward and superiorly, and it especially controls smiling. “Zygomatic Bone.” Biology Dictionary. As with many irregular bones, indentations and articulations provide passageways for important nerves and blood vessels.

The channel that starts at the zygomatico-orbital foramen and splits to exit from the zygomaticofacial and zygomaticotemporal foramina is called the zygomatic canal. It is always important to name the bone of origin as more than one can contribute to another structure.

Its origin site is on the zygomatic bone, just in front of the zygomaticotemporal suture. The person will be asked to rest and keep head movement and jolts to a minimum. In synergy with risorius, zygomaticus major produces the expression of smiling. At its origin, it is located deep towards the orbicularis oculi. Processes are projecting pieces of bone that insert into other bones. Continuing along this ridge, you will feel it lift to form the outer edge of the eye socket. Both zygomaticus muscles elevate the corner of the mouth as well as move it lateralward. Netter, F. (2019). From a lateral view, the zygoma are rectangular in form. Contractions of this muscle produce facial expression of pleasure or laughter. The main action provided by the zygomaticus major is to lift the angle of the mouth upwards and laterally. Vascular supply to zygomaticus minor comes from the superior labial branch of facial artery. Illustrated Anatomy of the Head and Neck – E-Book, 4. Read more. Reading time: 3 minutes. Grounded on academic literature and research, validated by experts, and trusted by more than 1 million users. Retrieved from https://biologydictionary.net/zygomatic-bone/. Edinburgh: Churchill Livingstone. This arch surrounds a large hollow that allows the temporal and masseter muscles to pass through to the lower jaw. Standring, S. (2016). The angle of the mouth is not drawn by the zygomaticus minor. Some researchers believe that when an individual with this anatomical attribute smiles, traction on the skin may create a dimple in the cheek. Kim Bengochea, Regis University, Denver, Author: Last reviewed: November 21, 2020 It is this arch that gives the mid-face its shape. In the case of bone displacement – often at the orbit bones and zygomatic arch – surgery is required. Its ligament is attached to the frontosphenoidal process of the zygomatic bone. It meets the zygomatic process of the maxilla bone and is concave in shape. It courses inferoanteriorly towards the lips, passing obliquely across the lateral surface of the maxilla. Please contact: is also supplied by the superior labial branch of the facial artery. Anatomy, Head and Neck, Zygomatic. The zygomaticus major muscle (also major zygomatic muscle or simply zygomaticus major, latin: musculus zygomaticus major) is a paired facial muscle that extends between the zygomatic bone and the corner of the mouth. Both zygomaticus muscles elevate the corner of the mouth as well as move it lateralward. You can see that these lines begin at the cheekbone in the below image. Edinburgh: Elsevier Churchill Livingstone. This fracture type typically requires surgery, especially when symptoms such as trismus (lockjaw) and hypesthesia (oversensitivity and pain) are present. In several cadaver dissections, the inferior bundle of the zygomaticus major has been observed to have an attachment along its middle portion. Working in synergy with the above mentioned direct labial tractors, zygomaticus minor elevates the upper lip and deepens the nasolabial lines.

accounts for around 40% of midface fractures, https://www.ncbi.nlm.nih.gov/books/NBK544257/, https://www.ncbi.nlm.nih.gov/books/NBK549898/, Frontosphenoidal process of the zygomatic bone, Zygomatic process of the maxilla bone (or malar process of the maxilla bone), Lateral palpebrae ligament (part of the levator palpebrae superioris), Levator labii superioris (the origin is the maxillary border of the zygomatic bone). An x-ray or CT scan may be needed. When you lift your lip to show your front teeth, you are making good use of your levator labii superioris. The zygomaticus is a set of small muscles which travel via eye socket till the lips, beside the cheekbone. The cheekbone naturally contributes toward how we look. Learning the anatomy of over 600 muscles can be a daunting task. A very graphic step-by-step dissection guide shows how to expose this fossa and its contents.

Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014).

The zygomaticus minor inserts into the skin of the lateral part of the upper lip and extends to the nasolabial sulcus. As we have already seen, this paired bone provides points for muscle attachment that enable facial expression and mastication. Nearby the node, a number of inserting fibers may mix in the risorius or the depressor anguli oris. This describes the back of the eye socket being broken and perhaps damaging the eye-ball or optic nerve. Zygomaticus major is a thin paired facial muscle that extends diagonally from the zygomatic bone (hence the name) to the angle of the mouth. A process is the point where one bone meets another but is not in itself an articulation. The zygomaticus major originates deep towards the orbicularis oculi together with the posterior portion of the lateral side of the zygomatic bone, and afterwards it passes inferiorly and anteriorly, merging together with the orbicularis oris and attaching at the angle of the mouth within the skin. The paired zygomaticus muscles bring the upper lips upward and out, helping us to smile. Blowout fractures of the orbit may or may not fracture the left or right zygoma. Such fractures can cause internal bleeding and may affect brain function even though they are not constantly visible to naked eye. High cheekbones – the ideal bone structure in the modeling world – is also the result of zygomatic arch shape. the cheekbone. Zygomatic branches of facial nerve course between the adjacent surfaces of these two respective muscles. Our engaging videos, interactive quizzes, in-depth articles and HD atlas are here to get you top results faster. This integrates movements of the cheeks, lips and chin, enabling various facial expressions and speech. 2020 Zygomatic bone location can easily be felt as it forms the ridge above the fleshy area of the cheeks, along the outer rim of the eyes. Textbook of Anatomy (Regional and Clinical) Head, Neck, and Brain; Volume III. Retrieved from. Additionally, is necessary to identify levator anguli oris from zygomaticus major, as both lift the corners of the mouth [4] . The wrinkles inferior to the eye develop, and at the outer angle of the eye crow’s feet develop. Zygomaticus minor is a thin paired facial muscle extending horizontally over the cheeks. Its origin site is located immediately behind the zygomaticomaxillary structure. The zygomaticus major arises from the zygomatic arch.

This inflammation creates: It is sometimes confused with sinusitis, but doctor can test for this condition by palpating the temporal tendon. Zygomaticus major muscle (Musculus zygomaticus major) - Yousun Koh. The zygomatic bone.¹; Insertion. The lower eyelid shifts slightly over the iris. An articulation is a joint that may or may not provide movement (cranial sutures are joints or articulations). Finally, the levator labii superioris is a triangular band of muscle that stretches from under the eye sockets to the muscles of the upper lip. In the zygoma, these four processes are the: Zygomatic processes, however, are found on other bones that extend into the zygoma. Zygomaticofacial: otherwise referred to as the malar branch, this nerve innervates the skin of the zygomatic arch and the upper cheek. Zygomaticus minor is placed in the same plane as, and superior to, zygomaticus major and sits inferiorly to orbicularis oculi. Philadelphia, PA: Lippincott Williams & Wilkins. Note how important it is to include the bone of origin – this avoids confusion. There are four processes of the zygomatic bone, but these are not zygomatic processes! (Updated August 2020).

Here, zygomaticus major interlaces with other muscles that converge towards the angle of the mouth, forming a dense, mobile, fibromuscular mass called the modiolus. •

Yu M, Wang SM. Biologydictionary.net Editors.

Clinically Oriented Anatomy (7th ed.). The function of this movement is to facilitate speech, as well as to enable various facial expressions, such as smiling. Keeping your finger at the temple, just behind this part of the eye socket, start to open and close your mouth and clench your jaw.


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