Lecture 3

Question 1

What are paranasal sinuses?

Answer 1

• Progressively expand into like named skull bones. Pneumatisation- meaning that the bone has been hollowed out • Thin, poorly vascular mucosa. Poor drainage predisposes to infection • Small obscure entry = high CO2 and virtually sterile

Question 2

What are the main functions of paranasal sinuses?

Answer 2

• Enlarge skull - Crumple protection - Provides thermal protection for the skull - Allows for a relatively larger skull without the burdening of increased weight -Provide resonance for vocalisation

Question 3

Name the main structures shown on this dog, why is 1 named slightly differently?

Answer 3

1. Maxillary recess, named this way as it opens freely onto the nasal cavity
2. Frontal sinus

Question 4

Name the main structures shown on this pig:

Answer 4

1. Maxillary sinus
2. Medial and lateral rostral frontal sinuses
3. Caudal frontal sinuses
4. Sphenoidal sinuses

Question 5

Name the structures shown on this ruminant:

Answer 5

1. Maxillary sinus
2. Dorsal conchal sinus
3. Rostral frontal sinus
4. Dorsal frontal sinus

Question 6

What species has a divided maxillary sinus?

Answer 6

a horse

Question 7

State the ages of the following horses:

Answer 7

A. 1 month

B. 1 year

C. 4- 6 years

D. Older than 12 years