Chapter 8 Chapter 8

Special SensesSpecial Senses: ….No Not ESP: ….No Not ESP

The Largely The Largely unknown:unknown:

““Holy Crap!?!?”Holy Crap!?!?” Sense Sense

Lecture 2: Eyes and EarsLecture 2: Eyes and EarsMostly just the Ear Mostly just the Ear

Disclaimer: Included in this presentation are pictures and or images you will not

find in your book, make note of the information and move on.

Working smarter is not working harder.Working smarter is not working harder.

As My Better Half says EVERYTIME we go Shopping “This will be quick I swear…”“This will be quick I swear…”

and the lies begin again…

This lecture was brought to you today by This lecture was brought to you today by our sponsors.our sponsors.

Humans against Humans that use Humans against Humans that use SnuggiesSnuggies

The You-Must-Be-Joking Snuggie

The Thingthatshouldnotbe

Snuggie

Snuggie Snuggie factoryfactory

Did you know?Did you know?

The first 4 years of lifeThe first 4 years of life are the most critical for speech and language development.

Auditory sense is present in the infant 24 weeks Auditory sense is present in the infant 24 weeks before birth.before birth. Meaning they can hear you in the womb and its helps them develop mental and auditory connections?

A baby in the womb can hear conversations 12 feet12 feet away?

Did you know?Did you know?

Sound travels better in water than in Sound travels better in water than in air? air? So all that splashing in JAWS? They never stood a chance…

Despite the size of ears an elephant’s hearing is Despite the size of ears an elephant’s hearing is poor?poor? But they can still stomp you in to paste if ticked off…

Whales, Dolphins, Porpoise, Bats, Shrews (GF joke here), Swifts and Oilbirds use Echolocation (also called Biosonar)Echolocation (also called Biosonar)?

The 1st 2 rules of “Fight Club” apply to all GF Jokes!!! Or I’m a DEAD DUCK!!!

Ear: Anatomy Ear: Anatomy Outside Outside In In

Make Note of these Structures

Anatomy of the EarAnatomy of the EarThe Pinna,The Pinna, the outer part of the ear, serves to "catch" the sound waves.

*you can easily supplement your natural pinnae by cupping your hands behind your ears.* (Wut?)(Wut?)

Sound waves travel into the ear canalear canal & vibrate the Tympanic Tympanic membranemembrane = The eardrum. The eardrum.

The EardrumThe Eardrum: acts just like a microphone. The fluctuations of sound waves push the drum back and forth.

Higher-pitch sound waves move the drum more rapidly, and louder sound moves the drum a greater distance.

Anatomy of the EarAnatomy of the EarThe middle ear: The The middle ear: The ossiclesossicles are the smallest bones in your body.

*Don’t write this down**Don’t write this down*They include:They include: •The malleus: the hammer •The incus: the anvil •The stapes: the stirrup

The cochlea:The cochlea: consists of 3 tubes (the membrane so thin we consider it 1 tube) coiled in the shape of a snail shell

Endolymph (the fluid inside):Endolymph (the fluid inside): stimulates the Auditory Nerve Auditory Nerve [Cranial Nerve VIII (8)][Cranial Nerve VIII (8)] and the signal travels to the brain and is then interpreted as sound.

The Science of Sound:The Science of Sound:The BreakdownThe Breakdown

Sound wave (Childish Whining)

Pinnae: Picks it up

Tympanic membrane/Eardrum

Vibrates

Middle Ear: Bones Vibrate

Cochlea and Endolymph is moved in waves matching

the sound frequency

Auditory Nerve is stimulated Cranial Nerve VIII (8)

Brain interprets the sound

Sarcastic Remark is made

The World is Good Again…

Let’s see how it all works shall we?Let’s see how it all works shall we?

One Sec Please…

Did you know?Did you know?To protect the inner ear from prolonged exposure to loud, low-pitch noises. The tympani muscletympani muscle and the stapedius musclestapedius muscle suddenly contract. This pulls the eardrum tight, so the drum becomes more rigid & you become deaf?

Commonly called “Concert Ear”Commonly called “Concert Ear”

After Rupturing an EardrumRupturing an Eardrum a common reaction is to vomitvomit? I know this personally…

Don’t ask…

Last thing: BalanceLast thing: Balance

The Lateral/ HorizontalThe Lateral/ Horizontal semicircular canal corresponds to vertical rotation The Superior and PosteriorThe Superior and Posterior semicircular canals detect rotations of the head in the Sagittal plane (Front to Back)In conjunction Vision plays a role in balance

Ok Lets Cut Stuff Up!!!Ok Lets Cut Stuff Up!!!