Nasal cavity

Question 1

Nose

Answer 1

Part of respiratory tract S to HP
- Contains the peripheral organs of smell
- Consists of the external nose and NCs, divided by a nasal septum.
- Each NC contains an olfactory area and a respiratory area

Question 2

NC

Answer 2

Lined w/mucosa continuous w/lining of all chambers that communicate w/NC:
- nasopharynx P
- paranasal sinuses S & L
- lacrimal sac & conjunctiva S
- Respiratory area of nasal mucosa: I 2/3, olfactory area found S

Question 3

NC bones

Answer 3

roof – (frontal), ethmoid, sphenoid bones; floor – maxilla and palatine, L walls – nasal conchae

Question 4

L nasal wall

Answer 4

3 mucosa-covered scrolls of bone form L nasal walls and project M:
- S nasal concha
- middle nasal concha
- I nasal concha
- Each concha forms roof for meatus (recess).
- meati provide passageways to paranasal air sinuses and nasolacrimal duct.

Question 5

Paranasal air sinuses

Answer 5

Air-filled extensions of respiratory part of NC located within several skull bones:
- frontal, ethmoid, sphenoid, maxillary
warm, moisten, and filter inhaled air, lighten skull and provide resonating chambers for speech

Question 6

PN sinus passageways

Answer 6

Spheno-ethmoidal recess: opening of sphenoidal sinus
- S meatus: entrance to P ethmoidal sinuses
- Middle meatus: entrance to frontal, ethmoidal, and maxillary sinuses
- I meatus: opening of nasolacrimal duct

Question 7

CN I

Answer 7

Special sensory: olfactory epithelium covers S nasal concha and S portions of nasal septum

Question 8

CN V1 and V2

Answer 8

• General sensory to nasal mucosa and palate via nasopalatine and greater palatine nerves
• Visceral motor: post-synaptic PSs to glands in mucosa (pre-synaptic PSs are delivered by CN VII)