The function of the zygomatic arch is protection of the eye, origin for the masseter and part of the
temporal muscles
temporal muscles
In anatomy, the temporalis muscle, also known as the temporal muscle, is one of the muscles of mastication (chewing). It is a broad, fan-shaped convergent muscle on each side of the head that fills the temporal fossa, superior to the zygomatic arch so it covers much of the temporal bone.
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Temporalis muscle – Wikipedia
, and to provide an articulation for the mandible. The zygomatic arch is approached by an incision made along its ventral border.
What are zygomatic arches?
zygomatic arch, bridge of bone extending from the temporal bone at the side of the head around to the maxilla (upper jawbone) in front and including the zygomatic (cheek) bone as a major portion.
Why is the zygomatic bone important to the function of the mouth?
The zygomatic bone is a paired facial bone. Both zygoma or cheek bones are irregular and articulate with other bones of the cranium and face. They are important contributors to mastication or chewing, providing an attachment point for the masseter muscle – a jaw adductor that closes the jaw.
What is the zygomatic arch and how is it formed?
The zygomatic arch is formed by the union of the temporal process of the zygomatic bone and the zygomatic process of the temporal bone at the zygomaticotemporal suture.
What runs under zygomatic arch?
The zygomatic arch is formed from parts of both the zygomatic bone and the temporal bone. … The hole allows the temporalis muscle and its associated tendons to pass under the zygomatic arch and attach the mandible bone to the skull.
What does the zygomatic arch articulate with?
In the human skull, the zygomatic bone (cheekbone or malar bone) is a paired irregular bone which articulates with the maxilla, the temporal bone, the sphenoid bone and the frontal bone.
What does zygomatic bone articulate with?
The zygomatic bone articulates with the sphenoid bone, maxilla, frontal bone, and temporal bone to form the lateral wall of the floor of the orbit, part of the temporal and infratemporal fossa, and the prominence of the cheek.
What is a zygomatic arch fracture?
Zygomatic arch fractures
After the nasal bone, the zygoma is the second most common bone of the face to be fractured. The group at highest risk is young males. Aetiology is usually blunt trauma to the cheek, such as involved in: Assault. Road traffic accidents.
What does the ethmoid do?
The ethmoid bone is a cube-shaped bone located in the center of the skull between the eyes. It helps form the walls of the eye socket, or orbital cavity, as well as the roof, sides, and interior of the nasal cavity.
What are the two processes that make up the zygomatic arch?
The zygomatic arch (cheek bone) is formed by the zygomatic process of temporal bone and the temporal process of the zygomatic bone, the two being united by an oblique suture (zygomaticotemporal suture).
What does the mastoid process do?
The temporal bone is one of the bones of the skull. Itis a complex bone, which along with many of its landmarks, features a bulgy prominence called the mastoid process. The mastoid process is easily palpable just behind the ears. It serves for the attachment of many head muscles.
How do you feel zygomatic arch?
Bone Palpation – Zygomatic Bone (Skull) – YouTube
How large is the zygomatic arch?
At mid-arch, the height of the trabecular bone mass is 6.89mm and the breadth is 1.38mm. Polar moment of area is 134.75 mm. Cylindrical zygomatic arch (1:1 height: breadth ratio), solid (no trabecular bone).
What’s the cheek bone called?
zygomatic bone, also called cheekbone, or malar bone, diamond-shaped bone below and lateral to the orbit, or eye socket, at the widest part of the cheek.
Why do humans have small zygomatic arches?
Zygomatic arches
They provide attachment points for the muscles of the lower jaw. The size of the lower jaw is correlated with the size and prominence of the zygomatic arches. Large, muscular jaws require large arches for attachment.
What muscle inserts on the mastoid process?
The mastoid process is part of the temporal bone. It is the insertion for the sternocleidomastoid muscle. In fact it is this muscle that causes this landmark to develop.
Where is the ethmoid?
The ethmoid bone is an unpaired cranial bone that is a significant component of the upper nasal cavity and the nasal septum. The ethmoid bone also constitutes the medial orbit wall.
What muscle originates on the zygomatic arch and inserts on the mandible?
The masseter is one of the muscles of mastication. It is a powerful superficial quadrangular muscle originating from the zygomatic arch and inserts along the angle and lateral surface of the mandibular ramus. The masseter is primarily responsible for the elevation of the mandible and some protraction of the mandible.
What is a zygomaticofacial foramen?
The zygomaticofacial foramen is a small foramen in the mid lateral surface of the zygomatic bone that transmits the zygomaticofacial nerve (a branch of the zygomatic nerve from the maxillary division of the trigeminal nerve) and zygomaticofacial vessels.
Which bone articulates with the zygomatic bone superiorly?
Frontal process of zygomatic bone
It is oriented superiorly, comprising the lateral outline of the orbit. It articulates with the zygomatic process of frontal bone superiorly via the zygomaticofrontal suture, and with the greater wing of sphenoid bone posteriorly via the sphenozygomatic suture.
What articulates with the nasal bone?
Each nasal bone articulates with the frontal, ethmoid, opposite nasal, and maxilla.
What bones make up zygomatic arch?
In anatomy, the zygomatic arch, or cheek bone, is a part of the skull formed by the zygomatic process of the temporal bone (a bone extending forward from the side of the skull, over the opening of the ear) and the temporal process of the zygomatic bone (the side of the cheekbone), the two being united by an oblique …
What happens if the zygomatic bone is damaged?
Fractures of the ZMC or zygomatic arch can often lead to unsightly malar depression, which should be corrected to restore a normal facial contour. ZMC fractures can also cause significant functional issues, including trismus, enophthalmos and/or diplopia, and paresthesias of the infraorbital nerve.
How does a zygomatic fracture happen?
Zygoma fractures usually result from high-impact trauma. Leading causes of fractures include assault, motor vehicle or motorcycle accidents, sports injuries, and falls.
What is the function of ethmoid sinuses?
It provides air for respiration, serves the sense of smell, conditions the air by filtering, warming, and moistening it, and cleans itself of foreign debris extracted from inhalations.
Does the nasal bone articulate with the ethmoid bone?
Articulations. —The nasal articulates with four bones: two of the cranium, the frontal and ethmoid, and two of the face, the opposite nasal and the maxilla.
What separates the anterior and posterior ethmoid?
They are separated into anterior and posterior groups by the basal lamella, the lateral attachment of the middle turbinate to the lamina papyracea. Historically the ethmoid sinuses were subdivided into 3 groups of air cells: the anterior, middle and posterior ethmoidal air cells.
Which of the following bones contributes to the zygomatic arch cheekbone )?
Together, the zygomatic bone and the temporal bone form the zygomatic arch. This region is the bony foundation of the facial prominence known as the cheek.)
What does mastoid mean in anatomy?
Definition of mastoid
(Entry 1 of 2) 1 : being the process of the temporal bone behind the ear also : being any of several bony elements that occupy a similar position in the skull of lower vertebrates. 2 : of, relating to, or occurring in the region of the mastoid process.
Is mastoiditis contagious?
Ear infections are the most common cause of mastoiditis. When a person does not receive antibiotics for mastoiditis, the bacteria can spread. If people stop taking antibiotics too soon, this can also allow the infection to spread.
What is above the mastoid bone?
superiorly: mastoid angle of the parietal bone via the parietomastoid suture. posteriorly: squamous part of the occipital bone via the occipitomastoid suture. anteriorly: tympanic part of the temporal bone via the tympanomastoid suture.
Can you palpate the zygomatic arch?
The entire length of the zygomatic arch of the temporal bone can be palpated.
Why does my zygomatic arch hurt?
Zygomatic arch pain is commonly reported by patients visiting the orofacial pain clinic and is majorly accepted to be caused by masseter muscle pain. But a variety of conditions may present as orofacial pain in the zygomatic arch region, including life-threatening diseases such as salivary gland tumors.
How do you tell if you break your zygomatic bone?
Broken cheekbone/upper jaw (zygomatic maxillary fracture)
- Flatness of the cheek.
- Altered sensation underneath the eye on the affected side.
- Problems with eyesight.
- Pain with jaw movement.
What is the weakest part of the skull?
One of the weakest points on the human skull is the ‘temple’ region. This is known anatomically as the pterion (see the image above) and is formed by the junction of the frontal, parietal and sphenoid bones.
What is the bridge of the nose bone called?
The nasal bones are two oblong halves that meet to form the bridge of your nose. The nasofrontal suture, which is a rigid fibrous joint that connects the two halves of the nasal bones, forms the thickest part of the nose.
What are the two bones that your outer nose is connected to?
Articulations. The nasal articulates with four bones: two of the cranium, the frontal and ethmoid, and two of the face, the opposite nasal and the maxilla.
Does the zygomatic bone contain a sinus?
It contains the largest of the paranasal sinuses, the maxillary sinus. … The hollow space is the frontal sinus, one of the paranasal sinuses, which we’ll look at shortly. Next we’ll look at the zygomatic bone. The zygomatic bone forms the bony prominence of the cheek.
Do all mammals have zygomatic arch?
The zygomatic bone is part of the facial skeleton of mammals, most reptiles, amphibians, and birds, but is absent in living amphibians.
Where are the palatine bones?
The palatine bones contribute to the posterior part of the roof of the mouth and floor and lateral walls of the nose, the medial wall of the maxillary sinuses and the orbital floors. Each bone (Fig. 5-66) consists of horizontal and perpendicular plates (laminae) set at right angles to each other.