The function of the zygomatic arch is protection of the eye, origin for the masseter and part of the temporal muscles
What are the 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. … The zygomatic arch is particularly large and robust in herbivorous animals, including baboons and apes.
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 is created by 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 muscle attaches to the zygomatic arch?
The bony junction between the temporal process of the zygoma and the zygomatic process of the temporal bone constitutes the zygomatic arch. The temporal fascia and masseter muscle are attached to the arch.
What is the zygomatic arch and how is it formed?
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?
Mastoid Process Function The mastoid process’ main function is to provide an area of attachment to several important muscles in the head. For instance, it is the attachment site of certain muscles of the neck: Sternocleidomastoid muscle – enables the rotation of the head to the contralateral side.
What structures contribute to the zygomatic arch quizlet?
Together, the zygomatic bone and the temporal bone form the zygomatic arch.What type of bone is the 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 is the weakest part of the skull?Clinical significance The pterion is known as the weakest part of the skull. The anterior division of the middle meningeal artery runs underneath the pterion. Consequently, a traumatic blow to the pterion may rupture the middle meningeal artery causing an epidural haematoma.
Article first time published onWhat 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 are the 3 surfaces of the zygomatic bone?
The zygomatic bone has three surfaces: lateral, posteromedial and orbital. The lateral (facial) surface faces towards the outside. It is smooth and convex, and it features a small opening called the zygomaticofacial foramen.
What is the difference between the zygomatic process and the zygomatic arch?
The zygomatic arch is formed from parts of both the zygomatic bone and the temporal bone. The extension of the temporal bone is known specifically as the zygomatic process, and attaches directly to the similarly shaped process on the zygomatic bone.
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.
In what way does a throat infection involve the mastoid?
Your eustachian tube connects your middle ear to the back of your throat. If an infection develops in your middle ear and blocks your eustachian tube, it may subsequently lead to an infection in the mastoid bone. This serious infection is known as mastoid bone infection of the skull, or mastoiditis.
What mastoid means?
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. mastoid.
Where in the body is the mastoid bone?
The mastoid is located just behind the ear. Mastoiditis is an infection of the bony air cells in the mastoid bone, located just behind the ear.
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 type of bone is the palatine bone?
The palatine bone or os palatinum is a paired, flat, irregular facial bone. It forms part of the nasal cavity, oral cavity, and orbit of the eye. Composed of two plates, each bone sits between processes of the right or left maxilla bone and the single sphenoid bone.
What is a ethmoid bone?
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.
Which of the following bones makes up part of the zygomatic arch?
The cranial portion of the zygomatic arch is formed by the zygomatic bone, and the caudal portion is formed by the zygomatic process of the temporal bone. The zygomatic arch forms the ventral and lateral rim of the orbit.
Which statement correctly describes the zygomatic arch?
Which statement correctly describes the zygomatic arch? The arch is formed by the maxilla and zygomatic bones. The zygomatic bone has a temporal process.
Is the ethmoid bone part of the axial skeleton?
The ethmoid bone forms the inferior portion of the nasal septum. The ethmoid bone is part of the axial skeleton.
What is a Inion?
Definition of inion : the external occipital protuberance of the skull.
What lies deep Pterion?
The pterion is known as ‘the danger area’ on the skull for head injuries. This is because the bone is thin at this site and is grooved by vessels on its internal surface (or may even lie in a bony tunnel here). It is the anterior branch of the middle meningeal artery (and vein) that lies deep to the pterion.
Do skulls have ear holes?
Yes, all mammals and probably all animals have a hole in the skull where the ears are. The ears are on the outside of the skull and the eardrum is still outside the majority of the skull. Since that is where the sound is detected, there has to be a hole for nerves going from the eardrum area to the brain.
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.
Can a zygomatic fracture heal on its own?
Zygomatic complex fractures with no or minimal displacement are often treated without surgical intervention, whereas fractures with functional or esthetic impairments in the form of diplopia, extraocular muscle entrapment, malocclusion, restricted mouth opening and/or depression of the malar prominence often …
Where is a zygomatic arch fracture?
Isolated arch fractures typically occur from a single blow to the lateral cheek. If the fractures are left untreated, facial contour asymmetry, functional deficits, and psychological consequences can develop. After an isolated fracture of the zygomatic arch, trismus and impaired mouth opening are known to occur.
What structures are part of the ethmoid bone?
Structure. The ethmoid bone is an anterior cranial bone located between the eyes. It contributes to the medial wall of the orbit, the nasal cavity, and the nasal septum. The ethmoid has three parts: cribriform plate, ethmoidal labyrinth, and perpendicular plate.
Which bones form the cheek?
The zygomatic bone forms the bony prominence of the cheek. It also forms the lower lateral part of the orbital margin, and this part of the lateral orbital wall. The zygomatic bone extends backward to meet the zygomatic process of the temporal bone, forming the zygomatic arch.
