Skull Bones

Question 1

What are the names of the skull bones?

Answer 1

• Frontal bone
• Temporal bone
• Sphenoid bone
• Parietal bones
• Occipital bones
• Ethmoid bone

Question 2

What are the features of the frontal bone?

Answer 2

Forms the forehead and the anterior portion of the cranial cavity (*It is a part of each orbit)
- supraorbital margin
- supraorbital foramen (artery and nerve)

Question 3

What are the features of the temporal bone?

Answer 3

Form the lower part of the sides of the head (temples), most of the inferolateral portion of the cranial cavity
- zygomatic process (zygomatic bone)
- mandibular fossa (mandible)
- external auditory meatus
- internal auditory meatus (CN VII, CN VIII)

Question 4

What are the features of the sphenoid bone?

Answer 4

The middle part of the inferior portion of the cranial cavity, part of each orbit, part of the nasal cavity
- Body
- Sella Turcica (pituitary gland)
- sphenoid sinus
- greater wing
- lesser wing
- pterygoid process (muscle attachments)

Question 5

What are the features of the parietal bone?

Answer 5

Form the top + upper part of the sides of the head, most of the superolateral portion of the cranial cavity

Question 6

What are the features of the occipital bone?

Answer 6

Form the top + upper part of the sides of the head, the back of the head and posterior portion of the cranial cavity
* occipital condyle (first cervical vertebrae C1)
* foramen magnum (medulla oblongata, CN XI, vertebral arteries)
* external occipital (protuberance - muscle attachments)
* superior nuchal line (muscle attachments)
* inferior nuchal line (muscle attachments)
* optic foramen (CN II)
* superior orbital fissure (CN III, CN IV, CN V, CN VI)
* foramen ovale (CN V)

Question 7

What are the features of the ethmoid bone?

Answer 7

Part of the anteroinferior portion of the cranial floor, part of each orbit, part of the border of the nasal cavity
- lateral mass (wall of the nasal cavity)
- ethmoid sinuses
- perpendicular plate (part of the nasal septum)
- olfactory foramina (CN I)
- cribriform plate (roof of the nasal cavity)
- crista galli
- middle nasal conchae
- superior nasal conchae

Question 8

What are the names of the facial bones?

Answer 8

Nasal bones, lacrimal bones, zygomatic bones, maxillae, palatine bones, vomer, inferior nasal conchae, mandible, mandibular

Question 9

What are the features of the nasal bones?

Answer 9

Separates the nasal cavity into left/right, composed on cartilage (anteriorly) and bone (posteriorly)
- nasal septum
- ethmoid bone (perpendicular plate)
- cartilage
- vomer

Question 10

What are the features of the lacrimal bones?

Answer 10

Interior eye sockets

Question 11

What are the features of the zygomatic bones?

Answer 11

Exterior eye sockets

Question 12

What are the features of the maxillae?

Answer 12

Above the jaw bone

Question 13

What are the features of the palatine bones?

Answer 13

Part of the hard palate

Question 14

What are the features of the vomer?

Answer 14

Part of the nasal system

Question 15

What are the features of the inferior nasal conchae?

Answer 15

Lower nasal conchae

Question 16

What are the features of the mandible?

Answer 16

Only movable bone in the skull other than the auditory ossicles
- coronoid process
- mandibular notch
- condylar process (temporal bone and temporomandibular joint)
- mandibular foramen (entry to the mandibular canal, which carries arteries and nerves to the teeth)
- ramus
- angle
- body