HEAD AND NECK II

Question 1

What’s the name of the bony opening for the nose on the skull?

Answer 1

The piriform aperture

Question 2

What separates the 2 nasal cavities?

Answer 2

The nasal septum

Question 3

What forms the narrow roof of each nasal cavity?

Answer 3

The cribriform plate

Question 4

What forms the lateral wall of the nasal cavities?

Answer 4

The maxilla, ethmoid bone and the perpendicular part of the palatine bone. Further back its formed by the medial pterygoid plate

Question 5

Where’s the frontal sinus?

Answer 5

Above the eye, slightly medially

Question 6

Where’s the maxillary sinus?

Answer 6

Medial to the zygomatic arch and slightly inferior. It extends backwards to the part of the maxilla that borders the pterygomaxillary fissure. It extends downwards almost to the root of the upper molar and premolar teeth

Question 7

Where are the sphenoid sinuses?

Answer 7

Below the floor of the anterior cranial fossa and inferior to the sella turcica.

Question 8

What’s behind the sphenoid sinus?

Answer 8

The basilar part of the occipital bone

Question 9

What’s in front of the sphenoid sinus?

Answer 9

The upper part of the nasal cavity

Question 10

What’s below the sphenoid sinus?

Answer 10

The nasopharynx

Question 11

Where are the ethmoidal air cells?

Answer 11

They extend from just behind the nasolacrimal duct, all the way back along the medial wall of the orbit

Question 12

What are either side of the floor of crista galli?

Answer 12

The cribriform plates

Question 13

What’s the most lateral part of the ethmoidal bone?

Answer 13

A paper-thin layer called the lamina papyracea, which forms the posteromedial wall of the orbit. The superior and middle conchae are also part of the ethmoid bone

Question 14

Where do the frontal and maxillary sinuses open?

Answer 14

The infundibulum beneath the middle conchae (not directly into the nasal cavity)

Question 15

What passage opens the frontal sinus into the nasal cavity?

Answer 15

The frontonasal duct

Question 16

Where does the sphenoid sinus open?

Answer 16

Into the nasal cavity, superoposteriorly to the superior conchae (sphenoethoidal recess)

Question 17

Where do ethmoidal air cells open into the nasal cavity?

Answer 17

Some open beneath the middle concha, and some open behind it

Question 18

Where does the nasolacrimal duct open?

Answer 18

Beneath the inferior concha

Question 19

Where does the spheno-palatine foramen open?

Answer 19

Near the back of the superior meatus

Question 20

What’s the name of the posterior opening of the nasal cavity?

Answer 20

The choanae, or posterior nares

Question 21

What’s the highest part of the nasal septum?

Answer 21

The olfactory area, which contains some of the fibres and nerve endings of the olfactory nerves, the sensory receptors for smell. The olfactory nerve fibres pass through the cribriform plate

Question 22

Where does blood supply to the nasal cavities come from?

Answer 22

The terminal branches of the maxillary and facial arteries of the external carotid, and ethmoidal branches of the ophthalmic artery from the ICA

Question 23

What innervates the nasal cavities?

Answer 23

The olfactory nerve (CN1)