Anatomy - The Special Senses - The Ear

Question 1

What is the external visible part of the ear called?

Answer 1

The pinna.

Question 2

What is membrane that separates the external ear from the middle ear called?

Answer 2

The diaphragm.

Question 3

Can the pinna move?

Answer 3

Yes

Question 4

What is the large, air-filled space in the temporal bone housing the ear structures called?

Answer 4

The tympanic bulla.

Question 5

What is the snail-shaped structure responsible for hearing called?

Answer 5

The cochlea.

Question 6

The bony labrynth contains a fluid called the __________.

Answer 6

Perlymph.

Question 7

The fluid within the membranous labyrinth of the inner ear is called the ________.

Answer 7

Endolymph

Question 8

The nerve responsible for converting sound vibrations into signals is called the _________.

Answer 8

The vestibulocochlear nerve (CN VIII)

Question 9

What are the bones in the middle ear called?

Answer 9

The malleus, incus and the stapes.

Question 10

Where is the tympanic membrane?

Answer 10

Between the external auditory canal and the middle ear.

Question 11

What nerve comes out of the cochlear?

Answer 11

Cochlear nerve

Question 12

What is attached to the oval window?

Answer 12

The stapes

Question 13

What is the tube that comes out of the middle ear and connects with the nasopharynx?

Answer 13

Eustachain Tube

Question 14

What nerve comes out of the semicircular canals?

Answer 14

The vestibular nerve

Question 15

What tube becomes so large in a horse it gets its own name?

Answer 15

The Eustachain tube. Called the guttural pouch.

Question 16

Is the tympanic bulla strong or weak?

Answer 16

Strong

Question 17

Is the sense of hearing or balance more complex?

Answer 17

The sense of balance is more complex

Question 18

What are the things in the semicircular tubes called?

Answer 18

Secular ducts, ampulla, utricle, and saccule.

Question 19

Where is the membranous labyrinth?

Answer 19

Inside of the bony labyrinth.

Question 20

What is the organ or corti?

Answer 20

An organ in the cochlea that amplifies sound.

Question 21

Where is the organ of corti found?

Answer 21

In the cross section of the cochlear between the perilymph, endolymph and the perilymph again.

Question 22

What are the parts of the scale media? Top to bottom.

Answer 22

Vestibular membrane, tectorial membrane, and the basilar membrane.

Question 23

What is in between the tectorial membrane and the basilar membrane?

Answer 23

The sterocillia and the hair cells.

Question 24

Where is the round window?

Answer 24

At the bottom of the cochlear.
Caudal to the oval window.

Question 25

The receptor cells for hearing located within the cochlea are part of the _______.

Answer 25

Cochlea hair cells

Question 26

What is the structure that receives vibrations from the stapes and transmits them to the cochlea called?

Answer 26

The oval window.

Question 27

What is the structure that detects changes in the head position and orientation in the inner ear called?

Answer 27

Utricle and the saccule

Question 28

What is the structure that connects the middle rear to the nasopharynx and helps to equilibrium pressure called?

Answer 28

The Eustachain tube.

Question 29

Where are the ampulla located?

Answer 29

The round things in the “body” between the semicircular tubes and the cochlea. They are on the ends of the membranous labyrinth.

Question 30

What x-ray view is used to see the tympanic bulla?

Answer 30

Open-mouth tympanic bulla view

Question 31

How many semicircular canals are there? What is the angle between each of them?

Answer 31

3 and 90°

Question 32

What is the thing called that is for balance in the inner ear called?

Answer 32

The Crista of Ampulla.

Question 33

What is the structure called that detects linear acceleration and deceleration in the inner ear called?

Answer 33

The two otolith sensors, the utricle and the saccule.

Question 34

What happens when the animals do not have a saccule or utricle?

Answer 34

Loss of balance occurs

Question 35

What is the bony labyrinth?

Answer 35

The bone that surrounds the the semicircular loops.

Question 36

What fluid is inside of the bony labyrinth?

Answer 36

Perilymph.

Question 37

What fluid is filled inside of the membranous labyrinth?

Answer 37

Endolymph.

Question 38

What fluid is filled inside of the membranous labyrinth?

Answer 38

Endolymph.

Question 39

How are nerve impulses created?

Answer 39

The fluid waves cause the tectorial membranes and the cilia & hair cells to rub against eachother causing a signal to be sent through to the cochlear nerve.

Question 40

True or false. Linear acceleration is when the sensors in the utricle and saccule become slanted.

Answer 40

True.

Question 41

True or false. The macula is an area of sensory epithelium in the utricle only.

Answer 41

False. The macula is an area of sensory epithelium in the utricle AND the saccule.

Question 42

What are hair cells?

Answer 42

Modified neurons.

Question 43

What is contained in the gel in the utricle and saccule?

Answer 43

Ca carbonate crystals.