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Function: it allows us to experience the outside world
5 sensory receptors Chemorecptors - stimulated by changes in the chemical– taste & smell* Pain Receptors - tissue damage - pain* Thermoreceptors - temp.- heat & cold* Mechanoreceptors – movements of body fluids - hearing & equilibrium* Photoreceptors – light - sig
2 groups of senses are: General (Somatic) and Special
General senses are – pain, touch, pressure, temperature and proprioception
General senses are found in skin, muscle, joints and viscera
Special senses are – taste, smell, sight, hearing, balance
Eyes include organs such as - – eyebrows, eyelids, conjuctiva, eyelashes, lacrimal apparatus, extrinsic eye muscle
Function of eyelids – protect eyes from foreign substances * wash tears over the surface of the eyes
Function of eyebrows – keeps perspiration out * shade the eyes from glaring sunlight
What is conjunctiva? It is a thin mucous membrane that lines the inner surface of the eyelids * It secretes a thin mucous film that moistens the surface of the eye * It is also caused by allergies and irritation
Function of Eyelashes – aka Cilia - helps in traping dust
Shapeand size of eye balls - spherical in shape, 3/4 to 1 inch (2 – 3 cm) in diameter
Lacrimal Apparatus - secretion, distribution and drainage of tears * tears moisten, lubricate and cleans the surface of the eye.
What is Retina? contains – cons and rods * innermost layer of the eyeball * sensitive to light thus called photoreceptors
List the 3 layers of the eye ball Sclera * Choroid * Retina *
What are the 2 cavities of the eyball? Anterior and Posterior
Function of ciliary body? Separates the Aqueous humor and Vitreous humor
What is Sclera? Tough fibrous connective tissue, covering most of the eyeball * Helps contain the contents of the eye * Shapes the eye * Site for attachment of the extrinsic eye muscles
What Cornea? Is an extension of the sclera to cover the iris Avascular Called window of the eye Rich supply of sensory nerve fibres thus sensitive to touch
Window of the eye - cornea
What is corneal reflex? If the surface of the cornea is touched lightly, the eye tears and blinks to remove the source of irritation, thus serving a protective function.
What is Choroid? The middle layer of the eye * * Highly vascular
Functions of Choroid? Provides retina with a rich supply of blood * Dark pigments located in the choroid absorb any excess light to prevent glare
Name the anterior extensions of the choroid and sclera Choroid – cililary body and iris * Sclera – cornea
Differentiate Cons and Rods? Cons -are most abundant, provides with colour vision * Rods – Sensitive to dim light, black and white vision.
Function of Ear Ear is the organ of the sense of hearing.
Parts of the ear - outer ear, middle ear, inner ear.
Parts of the outer ear, which you can see – auricle. It is a cartilage covered by a loose fitting skin.
Function of the auricle – gathering and directing sound waves
What separates the outer ear from the inner ear? Tympanic membrane
What is earwax? Auditory canal is lined with tiny hairs and glands that secrete cerumen, a yellowish waxy substance called earwax.
Function of cerumen? The ear wax or cerumen protect the inner ear from dust and dirt.
Why should we not any foreign objects in our ear? This could push the ear wax towards the eardrum thus imparing it from hearing.
What is the middle ear? Small air-filled chamber located between the tymphanic membrane and the bony wall.
Parts of the inner ear – tymphanic membrane, malleus, incus, stapes, eustachian tube
Functions of the ossicles – transmit vibration from the tymphanic membrane to the oval window.
Proprioception Sense of the body position and movement. Often uses as a test for nervous system damage.
Pinna ear flap, what we see
Cochlea snail shell-shaped cavity
Organ of Corti receptor organ of hearing; runs the length of the cochlea in the cochlear duct
Vascular middle layer of eye. Contains Choroid, Iris, Ciliary body
Nervous inner layer of eye; retina. Contains sensory receptors; rods and cones
Anterior chamber in front of the iris
Posterior Chamber behind the iris
Lens soft transparent, elastic, biconvex
Iris changes pupil size. colored portion of eye
Rods Greys
Cones Color
Created by: Abraham321