The eye
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The eye is the main structure of vision
(One of our most dominant senses)
The wall of the eyeball consists of three layers: the Sclera and cornea ; the choroid, ciliary body, and iris; and the retina.
(1) Sclera; the white of the eye.
(2) Cornea; transparent window in which light enters the eye and bulges slightly outward.
(3) Choroid; a layer containing many blood vessels that supply nutrients and oxygen to the tissues of the eye.
(4) Ciliary body; a ring of tissue, primarily muscle, that encircles the lens.
(5) Iris; The colored portion of the eye
(a) Pupil ; the opening in the center of the iris through which light enters the eye
(6) The Retina; the innermost layer of the eye, contains almost a quarter-million photoreceptors
(One of our most dominant senses)
The wall of the eyeball consists of three layers: the Sclera and cornea ; the choroid, ciliary body, and iris; and the retina.
(1) Sclera; the white of the eye.
(2) Cornea; transparent window in which light enters the eye and bulges slightly outward.
(3) Choroid; a layer containing many blood vessels that supply nutrients and oxygen to the tissues of the eye.
(4) Ciliary body; a ring of tissue, primarily muscle, that encircles the lens.
(5) Iris; The colored portion of the eye
(a) Pupil ; the opening in the center of the iris through which light enters the eye
(6) The Retina; the innermost layer of the eye, contains almost a quarter-million photoreceptors
The ear
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Three main parts: Outer Ear, Middle Ear, and Inner Ear
(1) The outer ear is a receiver
(2) The middle ear serves as an amplifier, with three tiny bones called the malleus (hammer), Incus (anvil), and the staples (stirrup).
(3) The inner ear is a transmitter. Sends neural messages to the brain.
ii) Unequal pressure in the ear is usually alleviated by the auditory tube (also known as the Eustachian tube).
iii) The inner ear has two sensory organs, only one of which, the cochlea, is concerned with hearing. The other sensory organ, the vestibule apparatus, is concerned with sensations of body position and movement.
(1) The outer ear is a receiver
(2) The middle ear serves as an amplifier, with three tiny bones called the malleus (hammer), Incus (anvil), and the staples (stirrup).
(3) The inner ear is a transmitter. Sends neural messages to the brain.
ii) Unequal pressure in the ear is usually alleviated by the auditory tube (also known as the Eustachian tube).
iii) The inner ear has two sensory organs, only one of which, the cochlea, is concerned with hearing. The other sensory organ, the vestibule apparatus, is concerned with sensations of body position and movement.
Smell & Taste
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You have millions of olfactory (smell) receptors located not in the nostrils, but in a small patch of tissue the size of a postage stamp in the roof of each nasal cavity.
Also known as the Olfactory membrane.
Also known as the Olfactory membrane.