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Special Senses

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by

Donna Tucker

on 12 May 2013

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Transcript of Special Senses

Special Senses Smell Located in the olfactory organ.
Chemicals must go all the way up the nasal cavity
Once activated information i sent to the olfactory nerve
Also called Olfactory receptors
Dissolved in mucus of nose
Receptors fatigue and no longer respond to the same odor or chemical Tongue Gustatory receptors
Found on the papillae
Also on roof of mouth and walls of throat
Made of taste cells/supporting cells
Type of chemoreceptor
Four types:
Sweet
Sour
Salty
Bitter Eyes Visual System
Consists of eye, optic nerve, and several accessory structures
Produces light to produce image
Refractions-cornea, lens, and fluid helps focus the light
Image projected upside down, sees in right eye and interprets in left side of brain.
Three main layers, two chambers, and number of special parts
Outer layer
Middle layer
Inner layer Outer Layer
sclera
white of eye
light can't pass
covers all except the front of eye
Limbus and Cornea
Numerous sense receptors Middle Layer
Choroid
Most blood vessels
Anterior-Iris and Ciliary body
Pupil, lens, and process of accommodation Inner Layer
Retina, nerve cells, optic disk, rods, cones
Differenciates different tones/hues of color, various types of color blindness Ears Parts of the ear: Inner, Middle, Outer
Outer ear parts are the Auricle or Pinna, External Acoustic Meatus, Tympanic membrane a thin membrane that vibrates
The middle of the ear is located in the Pharyngotympanic tube
Outer and Middle ear help to protect and maintain conditions for hearing
The Inner part of the ear: contains organs of the senses of hearing and equilibrium. The cochlear duct is the only part of the inner ear involved in hearing What did you learn? 1. What must chemicals do in order to activate smell receptors?

A. A chemical reaction
B. Chemicals have to go all the way up the nasal cavity
C. The Gustatory Receptors have to go to the cerebrum
D. You have to smell a really strong sent B. Chemicals must diffuse all the way up the nasal cavity 2.Where are sour chemicals tasted the most?

A. The tip of the tongue
B. The sides of the tonuge
C. The tip and sides of the tongue
D. The back of the tongue B. The sides of the tongue 3. What is the pupil?

A. Blood vessels in the eye
B. A place in the eye with no pigment
C. The opening of the Iris
D. Black dye in the eye C. The opening of the Iris. 5. What helps to maintain hearing conditions for the ear?

A. Outer and Middle ear
B. Middle and Inner ear
C. Inner ear
D. Outer ear A. Outer and Middle ear 4. What is the colored part of the eye called?

A. Cornia
B. Choroid
C. Lens
D. Iris D. Iris Special Senses By: Kennedy Tucker and Ayani McReynolds How do we hear?
Sound waves travel through the ear canal until they reach the ear drum
The ear drum passes the vibrations into the middle ear bones and into the inner ear
Inner ear is shaped like a snail and is called cochlea
Thousands of tiny hair cells
Change vibrations into electrical signals that are sent to brain though hearing nerve
Hair cells have a small patch of setereocilia at the top of it
Stereocilia rocks back and forth
If hair cell dies it will never grow back
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