The Skull

Question 1

Paired facial bones (6)

Answer 1

Zygomatic bones
Lacrimal bones
Nasal bones
Palatine bones
Maxillae
Inferior nasal conchae

Question 2

Unpaired facial bones (2)

Answer 2

Vomer

Mandible

Question 3

How is the cranial cavity accessed in surgery?

Why this method?

Answer 3

Bone flap.

Periosteum has poor osteogenic properties, so it is plated/wired often. Healing is best when a flay of overlying tissues are maintained.

Question 4

Coronal suture separates:

Answer 4

Frontal and both parietal bones

Question 5

Sagittal suture separates:

Answer 5

Both parietal bones

Question 6

Lambdoid suture separates:

Answer 6

Parietal and occipital bones

Question 7

Squamous suture separates:

Answer 7

Temporal and parietal bones

Question 8

Features of temporal bones (7)

Answer 8

External auditory meatus
Internal auditory meatus
Mastoid process
Styloid process
Mandibular fossa
Zygomatic process
Groove for sigmoid sinus

Question 9

Features of internal occipital bone (5)

Answer 9

Hypoglossal canal
Jugular notch
Groove for sigmoid sinus
Groove for transverse sinus
Groove for superior sagittal sinus

Question 10

Foramina of the sphenoid bone (3)

Answer 10

Foramen rotundum
Foramen ovale
Foramen spinosum

Question 11

What exits the foramen spinosum?

Answer 11

Middle meningeal a.

Question 12

Superior orbital fissure is within which bone?

Answer 12

Sphenoid bone

Question 13

Pterygoid plates (medial and lateral) are on which bone?

Answer 13

Sphenoid bone

Question 14

What attaches to the crista galli?

Answer 14

Falx cerebri

Question 15

What makes up the superior part of the ethmoid bone?

Answer 15

Ethmoid air sinuses
Cribiform plate
Cribiform foramina (passageway for CN I)

Question 16

Where does the lacrimal bone sit within the orbit?

Answer 16

Medial side

Question 17

Which bones for the bridge of the nose?

Answer 17

Nasal bones

Question 18

What passes thru the lacrimal groove?

Answer 18

Nasolacrimal duct

Question 19

Inferior part of nasal septum is formed by which bone?

Answer 19

Vomer

Question 20

Features of maxillae (6)

Answer 20

Palatine process (part of posterior part of hard palate)
Incisive foramen
Alveolar process
Maxillary sinus
Infraorbital foramen
Zygomatic process

Question 21

What does the incisive foramen separate?

Answer 21

Hard palate from anterior nasal spine

Question 22

What does the alveolar process do?

Answer 22

Hold the teeth of the upper jaw

Question 23

What is the largest paranasal sinus in the skull?

Answer 23

Maxillary sinus

Question 24

LeFort fx I
LeFort fx II
LeFort fx III

Answer 24

LeFort fx I: only maxilla is fx
LeFort fx II: pyramidal fx
LeFort fx III: all facial bones are detached

Question 25

Which bones make up the orbital complex? (7)

Answer 25

``` Frontal bone Greater and Lesser wings of sphenoid bone Lacrimal bone Ethmoid bone Perpendicular plate of palatine bone Orbital surface of maxilla Zygomatic bone ```

Question 26

Roof of orbit is from (2):

Answer 26

Lesser wing of sphenoid bone | Frontal bone

Question 27

Medial wall of orbit is from (3):

Answer 27

Frontal process of maxilla Lacrimal bone Lateral mass of ethmoid bone

Question 28

Floor of orbit is from (3):

Answer 28

Perpendicular plate of palatine bone Orbital surface of maxilla Zygomatic bone

Question 29

Lateral wall of orbit is from (3):

Answer 29

Zygomatic process of frontal bone Greater wing of sphenoid bone Orbital surface of zygomatic bone

Question 30

Paranasal sinuses (4)

Answer 30

Frontal Sphenoid Ethmoid Maxillary

Question 31

Fontanelle of the fetal skull (4)

Answer 31

``` Anterior fontanelle (frontal and parietal) Sphenoid fontanelle (frontal, parietal, temporal and sphenoid) Mastoid fontanelle (parietal, temporal, occipital) Posterior fontanelle (occipital, parietal, temporal) ```

Question 32

Which bone unites the cranial and facial bones AND articulates with almost every bone in the skull?

Answer 32

Sphenoid bone