The Ears

Question 1

The pinna

Answer 1

Acts as a funnel to channel sound waves down the external acoustic meatus to tympanic membrane

Made up of elastic cartilage

Question 2

Ceruminous glands

Answer 2

Produce ‘ear wax’

Question 3

Which photoreceptor detects coloured light?

Answer 3

Cones

Question 5

What is the bone around tympanic cavity called?

Answer 5

Tympanic bulla

Question 6

The Tympanic memrbane

Answer 6

(Ear drum)

Forms a boundary between the external and middle ear

Sound waves cause membrane to vibrate

Vibrations passed into auditory ossicles

Question 7

The Bony Labyrinth

Answer 7

Linked to the middle ear by two membranes:
1. bony window or cochlear window
2. Oval window or vestibular window

Question 8

Endolymph

Answer 8

fluid that fills membranous labyrinth

Question 9

Membranous cochlea

Answer 9

Detects sound

Question 10

Membranous vestibule

Answer 10

Filled with endolymph and sensory cells which help maintain balance when standing still

Question 11

Membranous semi-circular canals

Answer 11

Each connected to vestibule by an area called ampulla

Ampulla is filled with a jelly substance called sensory cupula which maintains balance whilst moving

Question 12

Perception of sound

Answer 12

1. Sound picked up at the pinna
   2.Transmitted to tympanic membrane
2. Over the auditory ossicles
   4.to oval window
   5.ripples the perilymph and then the endolymph
   6.receptor cells in the cochlear receive vibrations
   7.Sends signal to nerve fibres carried by cochlear branch of vestbulocochlear nerve
   8.To the auditory cortex of cerebral hemispheres
   9.here it is interpreted by sound

Question 13

Organ of Corti

Answer 13

Sensory receptor organ located in cochlea, detects sound

Question 14

Utricle

Answer 14

Structure in vestibule responsible for detectinh Horizontal movement

Question 15

Saccule

Answer 15

Structure in vestibule responsible for detecting vertical movement

Question 16

Capula

Answer 16

Detects rational movement and maintain balance