1. Parts of the Face

2. The Eye

3. Structure: sphere about 1 inch in diameter Function: vision (dah)
Protected by:
Orbital Socket, Eyebrows, Eyelids, & Eyelashes
Continuously bathed in fluid (tears)
Tears: secreted by the lacrimal gland
Flows across the eye into the lacrimal duct at the corner of your eye which empties into your nasal cavity
Conjunctiva – membrane that lines eye and eye lid
Secretes mucus to lubricate eye

5. Sclera – Outer layer (whites)
Function:
Muscle attachments
Extrinsic eye muscles – each controls a different movement)
Maintains shape
Protects inside of eye

6. Cornea – Clear coat No blood vessels Has pain and touch receptors
Function: Protection

7. Choroid Coat – Pupil & Iris
Middle layer of eye
Pupil: the black part of eye
Function: permits passage of light
Big Pupil (Dilated): allows lots of light in
Little Pupil (Contricte): Limits light
Iris: Colored part
Has 2 muscles (intrinsic eye muscles) – control the pupil;

8. Lens - directly behind iris and pupil
Elastic and Disc shaped
Losses its elasticity with age
Function: to refract light
Retina – innermost layer
Sends image to optic nerve

9. The Ear

10. Function: Hearing & balance (equilibrium)
Consists of 3 parts
Outer – collect sounds
Middle – collect sounds
Inner – analyze sounds waves and maintain balance

11. Outer Ear Outside and ear canal only
Outside is known as the Pinna or auricle
Composed of skin and cartilage
Canal (Meatus) about 1 inch in adults
Closed by the eardrum (tympanic membrane)
Skin produces wax (for protection)

12. Middle Ear – small cavity between eardrum and inner ear
Conducts sounds to inner ear by 3 tiny movable bones (ossicle)
Not connected to outside (eardrum blocks it)
Has a Tube (eustrachian) for ventilation which runs down back of the nasal cavity
Normally closed except when swallowing and yawning

13. Inner Ear
Very intricate series of structures deep in the skull

14. The Nose

15. Composed of bone, cartilage and skin
Function: air passage & sense of smell
Warms, moistens and filters air before it travels to the lungs
Can detect different smells
Smell accounts for about 90% of what we think of as taste

16. Structure: Junction of nasal bones forms the bridge
Separated in halves by the nasal septum
Hard palate – roof of mouth, nasal cavity is right above that

17. Mouth
Composed of soft and hard palate, mucous membranes, tongue, teeth (32), lips and cheeks
Jaw is made of maxilla (does not move) and mandible (moves)
Mandible and maxilla attach at the skull at the temporomandibular joint (TMJ)