Sensory System - Module 3

Question 1

What are the outer parts/layers of the eye?

Answer 1

• Sclera - (outermost layer) (tough/connective tissue), “white” of the eye
• Cornea - clear/circular part at front of sclera which allows light rays to enter
• Choroid Coat - (middle layer) contains blood vessels and ciliary muscles
• Retina (innermost layer) - contains nerve cell layers which transmit impulses to the brain through rods and cones

Question 2

What are the inner parts of the eye?

Answer 2

• Iris - (surrounds lens) colored portion of the eye which contains muslces to contract/dialate pupil (muscle strings attached to pupil in diagram)
• Lens - (behind pupil) refracts light to focus on retina
• Aqueous Humor - refracts light and fills space b/w cornea and iris
• Vitreous Humor - refracts light and fills space within retina

Question 3

What is the pathway of light refraction within the eye?

Answer 3

1. Cornea
2. Aqueous Humor
3. Pupil
4. Lens
5. Vitreous Humor

• Refracted to focus on retina and picked up by cones/rods to transport to brain for interpretation through optic nerve

Question 4

How is the eye protected? What are Lacrimal Glands and Conjunctiva?

Answer 4

• Enclosed in skull’s bony socket
• Lacrimal gland produces tears
• Eyelids/lashes
• Conjunctiva (mucous membrane) lines eyelids and covers the front of eye

Question 5

What are the parts of the Outer Ear?

Answer 5

• Pinna (Auricle) - (visible part of outer ear/outermost layer) leads to auditory canal (external auditory meatus)
• Auditory Canal - (middle layer) secretes earwax to protect ear
• Tympanic Membrane (Eardrum) (innermost layer) recieves chanelled energy and vibrates when sound waves hit to produce noise

Question 6

What are the parts of the Middle Ear?

Answer 6

• Ossicles (malleus/mallet, incus/anvil, stapes/stirrups) - convert energy into sound waves
• Eustachian Tube - connects middle ear to pharynx (throat) and allows pressure equalization on both sides of tympanic membrane

Question 7

What are the parts of the Inner Ear?

Answer 7

• Cochlea - (snail shell appearance) contains delicate hair-like cells which make up the organ of Corti, picking up sound waves to send to auditory nerve
• Auditory Nerve - picks up sound waves to send to the brainstem/thalamus for interpretation
• Semicircular Canals - contain fluid and delicate hair-like cells that bend when liquid moves to end information to the cereberum to help maintain balance/posture

Question 8

Which sense includes a mass of muscle tissue that contains papillae?

what is papillae?

Answer 8

Taste

papillae are bumps along the top of the tongue–“taste buds”

Question 9

What do olfactory receptors do?

Answer 9

They are responsible for odor detection, enabling the brain to signal sense of smell

Question 10

If someone has a cold, what will happen to their sense of taste?

Answer 10

Sense of taste will diminish due to the sense of smell being more sensitive than taste