The zygomatic arch (cheek bone) is formed by the zygomatic process What makes up your identity? 10 things that make up your identity.
What are the components of 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 Three bones make up the zygomatic arch?
The facial area includes the zygomatic, or malar, bones (cheekbones), which join with the temporal and maxillary bones to form the zygomatic arch below the eye socket; the palatine bone; and the maxillary, or upper jaw, bones.
What is the zygomatic arch formed from?
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.
What is the zygomatic bone composed of?
Processes. Each zygomatic bone is diamond-shaped and composed of three processes with similarly named associated bony articulations: frontal, temporal, and maxillary.
What structures contribute to the zygomatic arch quizlet?
Together, the zygomatic bone and the temporal bone form the zygomatic arch.
What is tympanic plate?
The tympanic plate is a small part of the temporal bone that separates the mandibular condyle from the external auditory canal. Fracture of this small plate is rare and usually associated with other bony fractures, mainly temporal and mandibular bone.
What bone articulates with the zygomatic process?
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 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 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 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 is a zygomatic arch on a dog?
The zygomatic arch is constituted cranially by the zygomatic bone and by the zygomatic process of the temporal bone caudally and gives lateral contour to the face and protects important glandular and neurovascular structures.
What two bone surface markings form the zygomatic arch?
The zygomatic arch is formed jointly by the zygomatic process of the temporal bone and the temporal process of the zygomatic bone.
What bones make up the cheekbone?
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.
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.
Is the mastoid process a bone?
mastoid process, the smooth pyramidal or cone-shaped bone projection at the base of the skull on each side of the head just below and behind the ear in humans.
What bones make up the zygomatic arch quizlet?
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.
Which facial bone makes up the central portion of the bridge of the nose?
The nasal bones are small tombstone shaped bones that form the bridge of the nose and don’t contain sinuses.] Ethmoid [The ethmoid bone forms the area of the cranium between the nasal cavity and the orbits.]
Which feature of the ethmoid bone contributes to the nasal septum?
The nasal septum is formed by the perpendicular plate of the ethmoid bone and the vomer bone. The septal cartilage fills the gap between these bones and extends into the nose.
What is a Petrosal Bulla?
One is the petrosal bulla, a small bony covering that protects the middle ear in the base of the skull. Other mammals have an auditory bulla, but only primates have one that is fused to the petrosa (a bony plate) before birth. The earliest fossil with a petrosal bulla dates to 55.5 million years ago.
What is the auditory meatus?
external auditory canal, also called external auditory meatus, or external acoustic meatus, passageway that leads from the outside of the head to the tympanic membrane, or eardrum membrane, of each ear. … The canal is nearly 1 inch (2.5 cm) in length and is lined with skin that extends to cover the tympanic membrane.
What are tympanic bullae?
The tympanic bulla (Bulla tympanica) is placed medially to the styloid process. This rounded prominence belongs to the pars tympanica and in great part, in Cats, to the endotympanic part. It is hollow, pneumatised by diverticules of the ear drum forming the multiple cells generally separated by very thin bony septums.
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.
Why is the zygomatic arch important?
The zygomatic arch plays a critical role in the mammalian masticatory system. Formed by the union of the zygomatic process of the temporal bone and the temporal process of the zygomatic bone, it is from this beam-like structure that the masseter muscle, a major jaw adductor, originates.
What attaches to the zygomatic arch and also to the angle of 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 attaches to the zygomatic process?
Zygomatic process of temporal boneLatinprocessus zygomaticus ossis temporalisAnatomical terms of bone
What superiorly attaches to the zygomatic arch and inferiorly attaches to the lateral side of the mandible?
The temporalis muscle attaches above to the bone and fascia in the temporal fossa, superior to the zygomatic arch, and below to the coronoid process of the mandible and along the mandibular ramus (Figure 6-17).
What causes a zygomatic fracture?
Zygoma fractures usually result from high-impact trauma. Leading causes of fractures include assault, motor vehicle or motorcycle accidents, sports injuries, and falls.
Where is a zygomatic arch fracture?
CLINICAL QUESTION/LEVEL OF EVIDENCE: The zygomatic arch is important for facial width and projection. 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.
How do you fix a zygomatic fracture?
Most zygomatic complex fractures can be treated solely by an intraoral approach and rigid fixation at the zygomaticomaxillary buttress. Further exposure of the zygomaticofrontal junction or inferior orbital rim is necessary for severely displaced fractures, which require additional fixation.
What respiratory muscle attaches to the mastoid process?
The mastoid process serves for the attachment of the sternocleidomastoid, the posterior belly of the digastric muscle, splenius capitis, and longissimus capitis.
What causes mastoiditis?
Mastoiditis is most often caused by a middle ear infection (acute otitis media). The infection may spread from the ear to the mastoid bone. The bone has a honeycomb-like structure that fills with infected material and may break down. The condition is most common in children.
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.
Do dogs have zygomatic arch?
Tissue or histological sections from 5 dogs and 1 cat with zygomatic arch masses were examined. Clinical presentations varied from chronic sneezing to facial swelling. Imaging consistently demonstrated osseous proliferation in the area of the zygomatic arch.
How do you palpate zygomatic arch?
The entire length of the zygomatic arch of the temporal bone can be palpated. To palpate the mastoid process of the temporal bone, palpate just posterior to the earlobe, then press medially and strum over the mastoid process by moving your palpating finger anteriorly and posteriorly (B).
Which muscle originates on the Epicranial Aponeurosis and inserts on the skin of the eyebrows?
Occiptalis muscle, frontalis muscle, and epicranial aponeurosis are collectively known as occipitofrontalis muscle. Together they draw the eyebrows up and wrinkle the forehead. The frontal belly, as seen above, originates on the epicranial aponeurosis and inserts on the skin of the eyebrow and forehead.
Does sphenoid bone articulate with maxilla?
The single sphenoid bone articulates with the maxillary bones. The superior orbital fissure is an oblique space between the lesser and greater wings of the sphenoid. It communicates the orbit anteriorly with the middle cranial fossa posteriorly. … The midline body of the sphenoid contains the sphenoid sinuses.
Which bones surround your tear ducts?
The nasolacrimal duct (tear duct) sits between the lacrimal and maxilla bones. The lacrimal bone is the point of insertion of the orbicularis oculi muscle.
