EAR The ear is a sense organ for

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EAR • The ear is a sense organ for hearing and balance • Three

EAR • The ear is a sense organ for hearing and balance • Three main portions of ear – Outer Ear : containing air – Middle ear : containing air – Inner ear : containing fluid • Only mammals contain ear lobes

Parts of ear Structure Function Pinna Fleshy part seen in the side of the

Parts of ear Structure Function Pinna Fleshy part seen in the side of the head Passage which leads to the eadrum Direct sound waves in to the auditory canal Directs sound wave to he eardrum Auditory canal

Parts of ear Structure Eardrum A thin membrane (tympanum) Function Vibrates when it receive

Parts of ear Structure Eardrum A thin membrane (tympanum) Function Vibrates when it receive the sound waves and passes the vibration to the ear ossicles Ear ossicles A chain of three small bones Magnify the sound vibrations and connecting the eardrum to the pass them on to the cochlea through oval window the oval window Oval window A thin membrane Transfers the sound vibrations from ear ossicles to the cochlea Round window A thin membrane below the oval window Help sound vibrations to pass through the cochlea Eustachian tube An air passage leading from the middle ear to the throat Helps to equalise the air pressure on each side of the eardrum

Parts of ear Structure Function Cochlea A coiled tube with sensory cells and filled

Parts of ear Structure Function Cochlea A coiled tube with sensory cells and filled with fluid Changes sound vibrations into nervous impulses for transmission to the brain Auditory nerve A bundle of nerves Carries nervous impulses connecting the cochlea to the from the cochlea to the brain Semicircular canals Three canals containing a fluid which swirls when the head is moved Help the body to maintain balance

Hearing Machanism Pinna- directs sound waves into the auditory canal Auditoty canal- directs sound

Hearing Machanism Pinna- directs sound waves into the auditory canal Auditoty canal- directs sound waves to the eardrum Eardrum- vibrates at the same speed as the sound wave Ear-ossicles- magnify the sound vibrations and make the oval window vibrate at the same frequency

Oval window- vibrates and makes the fluid in the cochlea vibrate Cochlea- changes the

Oval window- vibrates and makes the fluid in the cochlea vibrate Cochlea- changes the sound vibrations into nervous impulses Auditory nerve- transmits the nervous impulses from the cochlea to the brain The brain- interprets the nervous impulses as sounds

Spot test 1. What’s the taste detected by the regions below?

Spot test 1. What’s the taste detected by the regions below?

2. State the 2 components which make up the central nervous system. 3. State

2. State the 2 components which make up the central nervous system. 3. State the 2 types of nerves. 4. State 5 types of receptors in the skin and their function. 5. What’s the 2 factors which affect the sensitivity of the skin? 6. What’s function of the sweat glands in the skin? 7. What is mucus? 8. How can a common cold decrease our sense of smell? 9. Why is the sense of taste called a chemical sense?

THE SENSE ORGANS Sense Organ A Sense OrganTHE SENSE ORGANS Sense Organ A Sense Organ
Middle ear Middle ear structures l Middle earMiddle ear Middle ear structures l Middle ear
Special Senses Ear Ear Development Ear Divisions ExternalSpecial Senses Ear Ear Development Ear Divisions External
The Inner Ear The internal ear inner earThe Inner Ear The internal ear inner ear
Ear We Go Outer Ear Pinna Ear CanalEar We Go Outer Ear Pinna Ear Canal
Ear Physiology External Ear External Ear is coveredEar Physiology External Ear External Ear is covered
The Ear Hearing and Balance Ear Structure EarThe Ear Hearing and Balance Ear Structure Ear
Audition Anatomy outer ear middle ear inner earAudition Anatomy outer ear middle ear inner ear
The Ear The ear is the sensory organThe Ear The ear is the sensory organ
The Ear The ear is the sensory organThe Ear The ear is the sensory organ
THE EAR The ear is the organ ofTHE EAR The ear is the organ of
EAR THE ORGAN OF HEARING INTRODUCTION The earEAR THE ORGAN OF HEARING INTRODUCTION The ear
Vestibulocochlear Organ The Vestibulocochlear Organ Parts external earVestibulocochlear Organ The Vestibulocochlear Organ Parts external ear