EXERCISE 13: Head

Question 1

protruding region of the head ending; anterior to the eyes in a more or less triangular border.

Answer 1

Snout

Question 2

two small openings near the tip of the snout.

Answer 2

external nares (nostrils) –

Question 3

found at the dorso-lateral portion of the head; these protected by the upper eyelids, lower eyelids, and the transparent third eyelid called nictitating membrane.

Answer 3

Eyes

Question 4

circular area of thickened membrane behind each eye;
under this membrane is the middle ear that bears a small bone, the columella, not evident externally.

Answer 4

tympanic membrane (eardrum) –