Restorative art week 2

What are the three major sutures of the adult skull

Coronal, Lambdoidal, and Squamosal.

Where is the coronal suture located

Between the frontal and parietal bones.

Where is the lambdoidal suture located?

Between the parietal and occipital bones.

Where is the squamosal suture located?

Between the temporal and parietal bones.

Why are an infant's cranial bones not fused at birth?

To allow passage through the birth canal.

What are an infant's "soft spots" called?

Fontanelles.

At what age do cranial bones usually fuse?

About 12–18 months.

After fusion, what happens to the cranial bones?

They remain fused throughout adulthood.

What is the most obvious skull change in old age?

Reduction in the size of the upper and lower jaws.

Why do the jaws become smaller in old age

Loss of teeth and absorption of the alveolar processes.

 Is the occipital bone paired or unpaired?

Unpaired.

Where is the occipital bone located

Back and base of the skull.

What is the function of the occipital bone?

Forms a cradle for the brain.

Are the parietal bones paired

Yes.

Where are the parietal bones located

Superior sides, back, and posterior two-thirds of the skull roof.

Are the temporal bones paired?

yes

Where are the temporal bones located?

Inferior sides and base of the skull.

 Is the frontal bone paired?

No, it is unpaired.

What does the frontal bone form

Forehead and anterior roof of the skull.

What is the external auditory meatus?

The ear canal opening.

What is the zygomatic arch?

The arch formed by the temporal and zygomatic bones.

What does the zygomatic arch determine?

The widest part of the face.

What is the mandibular fossa?

Depression where the mandibular condyle articulates.

Where is the mandibular fossa located?

Just anterior to the external auditory meatus.

What is the mastoid process?

Rounded projection behind the ear on the temporal bone

What is the vertical surface of the frontal bone?

The forehead.

What is the horizontal surface of the frontal bone?

The crown of the skull.

What is an eminence?

A bony prominence or projection.

What are the frontal eminences?

Rounded prominences on either side of the frontal bone.

What are the supraorbital margins?

Superior rims of the eye sockets.

What are the superciliary arches?

Bony ridges above the eyebrows.

What is the glabella?

Bony prominence between the eyebrows at the root of the nose.

Which interior cranial bones are important to know?

Sphenoid and Ethmoid.

Where is the sphenoid bone located?

Base of the skull (interior).

Where is the ethmoid bone located?

Between the eyes.

Where are the nasal bones located?

Directly below the glabella.

What do the nasal bones form?

Dome over the superior nasal cavity.

What are the zygomatic bones commonly called

Cheekbones.

What shape are the zygomatic bones?

Diamond-shaped.

What is the zygomatic arch depression

Depression below the zygomatic arch on the lateral cheek.

What forms the lateral rim of the eye socket?

The zygomaticofrontal process.

What are the alveolar processes?

Bony ridges containing tooth sockets.

Where are the alveolar processes found?

Inferior maxilla and superior mandible.

What is the nasal spine of the maxilla?

Small bony projection at the lower margin of the nasal cavity

What is the frontal process of the maxilla?

Ascending part of the upper jaw that meets the frontal bone.

 What is the widest part of the cranium?

Between the parietal eminences.

 What is the widest part of the face?

Between the zygomatic arches.

What is the widest part of the lower one-third of the face?

Between the angles of the mandible.