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Special senses 1
1. SPECIAL SENSES:
The Eye and the Ear
ByB
by
Oluwatosin Owasanoye
Medical Terminology
Presentation 13 J
2. Functions of the Eye and Ear
• The eye and ear are extremely intricate organs which allow us to see
and hear our environment.
• The eye receives and focuses light and converts this energy into
nerve impulses that are sent to the brain.
• The ear functions include hearing, static equilibrium (balance while
standing still),and dynamic equilibrium(balance when moving).
• The nerve impulses originate from the retina.
• Visual receptors in the retina called rods can work in low intensity
light.
• Visual receptors called cones operate in high intensity light and do
receive colors.
• The outer and middle parts of the ear are responsible for sound
gathering and transmission of sound.
• The inner ear has the nerve endings for hearing and equilibrium.
3. Four of The Most
Common Eye
Conditions
•Myopia(nearsightedness)-
People with Myopic vision
usually have eyeballs that are
too large for their lens and
cornea to focus light properly
on the retina.
•Hyperopia(farsightedness
)-Hyperopia vision is caused
by the eyeball being too small
for the lens and cornea to focus
light properly on the retina.
•Presbyopia(aging eyes)-As
people age, they often begin to
have difficulty focusing their
eyes for reading or close work.
•Astigmatism(distorted
vision)-People with
Astigmatism have irregularly
shaped cornea.
4. The Eye :Anatomy
and Physiology.
The study of the eye is
known as
ophthalmology.
Structure of the eye:
Eyeball
Sclera
Choroid
Retina
Eye muscles
Eyelids
Conjunctiva
Lacrimal apparatus
5. COMMON CAUSES OF VISION
LOSS
Cataracts
Age-Related muscular Degenration-(AMD)
Glaucoma
Diabetic Retinopath
Eye Injuries
Optic Nerve Hypoplasia
Retinopathy of Prematurity-(ROP)
Neurological Visual Impairment-(NVI)
Ocular Albinism
Coloboma
6. The Ear: Anatomy
and Physiology.
The Ears are paired sensory organs
comprising the auditory system,
involved in the detection of sound, and
the vestibular system, invoved with
maintaining body balance
/equilibrium.The ear divides
anatomically and functionally into
three regions:
External Ear
Pinna
External Auditory Canal
Middle Ear
Tympanic membrane(Ear Drum)
Auditory Ossicles
(malleus,incus,stapes)
Middle Ear Cavity
Eustachian Tube
Inner Ear
Oval Window
Round Window
Cochlea
Semicircular Canals