Nasal Cavity

Question 1

Boundaries of nasal cavity

Answer 1

Roof:

Anterior Part

Boundaries

1. Nasal cartilage
2. Nasal bone 3. Frontal bone

Middle Part: cribriform plate of ethmoid. Posterior Part: body of the sphenoid bone

Floor: Hard palate Medial wall: nasal septum formed

of 3 par 1. Septal cartilage: anterior

2. Vomer: posterior
3. Perpendicular plate of ethmoid: superi

Lateral wall: contains:

1. 3 elevations called conchae:

Superior, middle and inferior. The superior & middle conchae are processes of ethmoid bone. The inferior

concha is a separate bone of the skull.

2. 4 spaces: recess and 3 meatuses
   a. Sphenoethmoidal recess: above the

superior concha. b. Superior meatus: below the

superior choncha

c. Middle meatus: below the middle choncha
d. Inferior meatus: below the inferior

choncha

3. The middle meatus contains:
   a. Bulla ethmoidalis: elevation made by the middle ethmoidal air sinus.
   b. Hiatus semilunaris: groove below

the bulla ethmoidalis.

c. Infundibulum: anterior extension of the hiatus semilunaris.

Question 2

Openings into lateral wall of nose

Answer 2

1. Sphenoethmoidal Recess: sphenoidal air sinus
2. Superior Meatus: posterior ethmoidal sinus
3. Middle Meatus:

Sphenoidal sinus

a. Middle ethmoidal sinus: into the bulla b. Anterior ethmoidal sinus: into the

anterior part of the hiatus semilunaris

e. Maxillary sinus: into the posterior part of

the hiatus semilunaris d. Frontal sinus: into the infundibulum

4. Inferior Meatus: Nasaolacrimal duct

Question 3

N supply to lateral nasal wall

Answer 3

Lateral Wall:

1. Upper Part: olfactory nerves
2. Anterior Part: anterior ethmoidal nerve from nasociliary nerve (ophthalmic nerve). 3. Remaining Part: nasal branches of the greater palatine nerve & sphenopalatine

Question 4

N supply to nose skin

Answer 4

Skin of the Nose: by

(1. ) Infratrochlear nerve: from the ophthalmic nerve
2. External nasal nerve: from the ophthalmic nerve 3. Infraorbital nerve: from the maxillary nerve

Question 5

N supply to nasal septum

Answer 5

Septum:

1. Upper Part: olfactory nerves
2. Anterior Part: anterior ethmoidal nerve from the

nasociliary nerve (ophthalmic nerve) 3. Remaining Part: nasopalatine nerve from maxillary

nerve. It carries secretory fibers to the nasal glands.

Question 6

Littles area of epistaxis

Answer 6

Anteroinferior of septum
Anastomosis of 
Ant eth A
Septal A
Sphenopalatine A

Question 7

Blood supply of nasal cavity

Answer 7

2 from the OPHTHALMIC artery:

1. Anterior ethmoidal artery 2. Posterior ethmoidal artery

2 from the MAXILLARY artery: 3” part

1. Sphenopalatine artery main supply
2. Greater palatine artery

2 from the FACIAL artery:

1. Lateral nasal artery
2. Septal branch of superior labial artery,

Question 8

Clinical Importance of Nasal Sinuses

Answer 8

Infection from nasal sinusitis can spread to surrounding areas:

1. Frontal sinusitis brain abscess and meningitis
2. Ethmoidal sinusitis orbital abscess.