Lecture 4: Skull

Question 1

What are the unpaired cranial bones?

Answer 1

Frontal

Occipital

Sphenoid

Ethmoid

Question 2

What is the attachment for the Falx Cerebri in the Ethmoid bone?

Answer 2

Crista Galli

Question 3

What 2 bones meet at the Squamosal suture?

Answer 3

Temporal bone and parietal bone

Question 4

What blood vessel is transmitted through the foramen spinosum?

Answer 4

Middle Meningeal A.

Question 5

Cleft lip is a failure of what bones to fuse?

Answer 5

Palatine and Maxilla

Question 6

What bone forms the superior portion of the Nasal Septum?

Answer 6

Perpendicular plate of Ethmoid bone

Question 7

What 2 bones meet at the Lambdoid suture?

Answer 7

Occipital bone and Parietal bone

Question 8

What part of the Vomer B. articulates with the Sphenoid B.?

Answer 8

Ala

Question 9

What is the clinical significance of the Pterion landmark on the skull?

Answer 9

Middle Meningeal A. lies just deep to it, can rupture if there is a blow to the side of the head

Question 10

What does a Le Fort I fracture involve?

Answer 10

Fracture of the alveolar process of maxilla

Question 11

Why would bone flaps be created during surgery?

Answer 11

Incorporating as much overlying tissue with the bone allows periosteium to heal the best

Can be skin, muscle, fascia, etc.

Question 12

What is the largest paranasal sinus in the skull?

Answer 12

Maxillary Sinus

Question 13

What bones form the medial wall of the orbit?

Answer 13

Maxilla (frontal process)

Lacrimal B.

Ethmoid B. (Lateral mass)

Question 14

What bones form the lateral wall of the orbit?

Answer 14

Frontal B. (zygomatic process)

Sphenoid B. (Greater wing)

Zygomatic B. (Orbital surface)

Question 15

What bones comprise the nasal complex?

Answer 15

Frontal B.

Ethmoid B.

Sphenoid B. (Superior and middle nasal conchae)

Horizontal plate of palatine B.

Maxilla

Inferior nasal concha B.

Lacrimal B.

Nasal B.

Question 16

What 2 bones meet at the coronal suture?

Answer 16

Frontal bone and Parietal bone

Question 17

What cranial bone does the pterygoid canal run through?

Answer 17

Sphenoid B.

Question 18

What does a Le Fort III fracture involve?

Answer 18

Fracture dislocating upper face from the cranium (through the orbit)

Question 19

What 2 bones meet at the saggital suture?

Answer 19

Both parietal bone

Question 20

What bone forms the inferior portion of the Nasal Septum?

Answer 20

Vomer Bone

Question 21

What articulates with each other when nodding your head yes?

Answer 21

Atlas and the Occipital Condyles

Question 22

What structure in the maxilla separates the hard palate from the anterior nasal spine?

Answer 22

Incisive foramen

Question 23

What cranial bone contains the foramen rotundum, foramen ovale, and foramen spinosum?

Answer 23

Sphenoid Bone

Question 24

What does a Le Fort II fracture involve?

Answer 24

Fracture of maxilla partially through the orbit and at the zygomaxillary suture

Question 25

What bones form the orbit?

Answer 25

Frontal B. Sphenoid B. Zygomatic B. Maxilla Palatine B. Lacrimal B. Ethmoid B.

Question 26

What bone is the cribiform plate located in?

Answer 26

Ethmoid Bone

Question 27

What are the paired cranial bones?

Answer 27

Temporal Parietal

Question 28

What bones form the floor of the orbit?

Answer 28

Palatine B. (Perpendicular plate) Maxilla (orbital surface) Zygomatic B.

Question 29

What is the clinical significance of the Anterior Fontanelle of the fetal skull?

Answer 29

Largest fontanelle, can extract CSF

Question 30

What are the paired facial bones?

Answer 30

Zygomatic Lacrimal Nasal Palatine Maxillae Inferior Nasal Conchae

Question 31

What bone is part of the orbit, nasal cavity, and hard palate?

Answer 31

Palatine Bone

Question 32

What are the unpaired facial bones?

Answer 32

Vomer Mandible

Question 33

What structure is found in the sella turcica?

Answer 33

Pituitary Gland ## Footnote *Clinical Significance: Tumor of pituitary gland can damage optical nerve and cause blindness*

Question 34

What are the paranasal sinuses?

Answer 34

Frontal Sphenoid Ethmoid Maxillary

Question 35

What is a metopic suture?

Answer 35

Incomplete fusion of the _frontal bones in the saggital plane_ -can cause clept lip or palate

Question 36

What bones form the roof of the orbit?

Answer 36

Lesser wing of sphenoid B. Frontal B.