Special Senses the eye and ear

1. Special Senses: The
Eye and Ear
Trevor Ben

2. Anatomy and Physiology of
the Eye
 The eye ball is composed of three layers sclera,
choroid and retina
 Sclera
 Is the most outer layer of the eye
 It provides a tough protective coating for the inner
structures of the eye.
 The cornea is the anterior portion of the sclera

3. Anatomy and Physiology of
the Eye
 Choroid
 The middle layer of the eyeball
 Provides the blood supply for the eye
 The choroid layer has three anterior portions iris, pupil,
and ciliary
 Retina
 The most inter layer of the eye ball
 Houses the sensory receptor cells that respond to light

4. Anatomy and Physiology of
the Ear
 The ear has two main purposes hearing and
equilibrium
 External Ear
 There are three parts to the external ear auricle, the
auditory canal, and the tympanic membrane
 Auricle is the visual part of the ear
 The auditory canal allows sounds to pass through the ear
and causes the tympanic membrane to vibrate
 The tympanic membrane separates the external ear from
the middle ear

5. Anatomy and Physiology of
the Ear
 Middle Ear
 Located in the small cavity in the temporal bone of the
skull
 Three bones located in the middle ear called ossicles
 The three bones are called malleus, incus, and stapes
and they help to amplify the sounds within the middle ear

6. Anatomy and Physiology of
the Ear
 Inner Ear
 Located in a cavity within the temporal bone
 Vestibule is the first structure within the inner ear
 The organs within the inner ear contains hair cells which
act as the sensory receptors