• Colored part of the eye
• Consists of circular and radial smooth muscle fibers that form doughnut-shaped structure
• Attaches to the ciliary body

• Fills both chambers of anterior cavity
• Clear watery fluid that often leaks out when the eye is injured
• Formed from blood in capillaries located in the ciliary body

1.  Fibrous layer

2.  Vascular layer

3.  Inner layer

• Pink-eye
• Infection of the conjunctiva
• Caused by numerous pathogens

• Cloudy spots on lens that develop with age
• May interfere with focusing
• Accounts for the trouble with night vision in older adults.

• Condition that causes excessive intraocular pressure caused by abnormal accumulation of aqueous
• Reduced blood flow due to pressure causes degeneration of the retina leading to loss of vision.

• AKA myopia
• Problems seeing with distance

• Results when the eyeball is elongated causing an incoming image to be focused on the front of the retina rather than on it.

• Or pinna
• Visible portion of ear

How many openings are there in the middle ear?

1. Opening from the external acoutstic meatus covered with tympanic membrane
2. Oval window
3. Round window
4. Opening into the auditory (eustachian) tube

What are gustatory cells?

• Sensory cells in taste buds; threadlike hairs extend from each cell into the taste pore.

• AKA intereoceptors
• Located internally, often within body organs, or viscera

1. Mechanoreceptors
2. Chemoreceptors
3. THermoreceptors
4. Nociceptors
5. Photoreceptors
6. Osmoreceptors

1. Most widely distributed sensory receptor
2. Primary receptors for pain, heat and cold
3. Tactile sensations

• Within the cribiform plate of the ethmoid bone.

1. Sour 
2. Sweet
3. Bitter
4. Umami
5. Salty

1. Malleus
2. Incus
3. Stapes

• Hammer
• Attached to the inner surface of the tympanic membrane

• Anvil
• Attached to the malleus and stapes

• Stirrups
• Attached to the incus

• Structure of the inner ear involved with balance

• Structure of the inner ear composed of clear, potassium-rich fluid filling the membranous labyrinth

• Divided into 2 cavities, anterior and posterior

• Lies in front of the lens and is further divided into anterior and posterior chambers.

• Larger than the anterior cavity
• Occupies all the space posterior to the lens, suspensory ligament, and ciliary body.

• Fills the posterior cavity
• semisolid material
• helps maintain sufficient intraocular pressure, with aqueous humor, to give eyeball its shape

• Progressive hearing loss usually associated with aging
• Results from degeneration of nerve tissue in the ear and vestibulocochlear nerve

• Chronic inner ear disease of unknown cause
• Characterized by tinnitus, progressive nerve deafness, and vertigo.