Ear and eye Lab

Question 1

External ear components

Answer 1

◼ Pinna (Auricle)
◼ External acoustic meatus

Question 2

Middle ear components

Answer 2

◼ Tympanic membrane (Tympanum)
◼ Tympanic cavity (and bulla)
◼ Auditory ossicles
◼ Auditory tube

Question 3

Internal ear (inner) components

Answer 3

◼ Cochlea
◼ Semicircular canals

Question 4

Ossicles span what structures

Answer 4

◼ From tympanic membrane to cochlea duct

Question 5

animals with cavitary bulla

Answer 5

◼ Dog
◼ Cat (have a complete septum)
◼ Sheep
◼ Horse (very small)

Question 6

animals with a septate bulla

Answer 6

◼ Cattle
◼ Camelids
◼ Goats
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ie. many little sections within it

Question 7

Collection and sampling of eye

Answer 7

◼ Ablation of eye with adnexa attached.
◼ Adnexa prevents fixation of globe
◼ Remove adnexa with curved scissors
◼ Once adnexa is removed, inject globe with formalin at corneoscleral junction.
◼ Send to laboratory in container of formalin.
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◼ Bouins fluid is an excellent fixative but difficult to obtain
◼ Davidson’s or modified Davidson’s fluid is the alternative.

Question 8

anterior chamber vs posterior chamber division

Answer 8

both are in the “anterior segment” (in front of the lens), and are divided by the iris.