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| Have receptors which receive stimuli: pressure, pain, touch and heat as well as light, scent, sound and taste. They carry info as impulses toward the central nervous system (the brain and spinal cord) |
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| Located in the spinal cord and in the brain. These neurons relay messages up to and down from the brain as well as throughout the brain. In the brain the impulses are interpreted. |
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| Carry impulses from the central nervous system and out to all the muscles in the body. Impulses carried by motor neurons cause the muscles to contract. Impulses caused by motor neurons may cause the body to move because many muscles are attatched to bone. |
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| Muscles that we can contract when we want to, to move our bones. |
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| Muscles that motor neurons activate that are in organs that you have no control over. ex) small intestine, blood vessles, the iris of the eye |
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PATH OF A STIMULUS EX) A CAT RUB AGAINST YOUR LEG
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| Travels along sensory neurons to the spinal cord up the spinal cord to the brain via interneurons for interpretation. |
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| The response which occurs without conscious thought |
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| The muscle receives the message and contracts faster than in an ordinary response to a sensory neuron. Because the impulses form an arc from the receptors into the spinal cord along the sensory neuron across an interneuron, and out a motor neuron. |
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| Is the amount of time measured in milliseconds it takes for you to react to a stimulus |
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| are used to detect objects in very dim light conditions |
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| are used in detecting objects of color during the daytime |
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| increases visual activity. |
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| The point at which the axons pass out of the retina, since photoreceptor cells are absent there. |
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LOCATE THE CHOROID [image] |
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LOCATE THE OPTIC NERVE [image] |
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LOCATE THE CILIARY BODY [image] |
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LOCATE THE ANTERIOR CHAMBER (AQUEOUS HUMOR) [image] |
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LOCATE THE VITREOUS HUMOR [image] |
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| Transparent in living animals, it bends light rays as they enter the eye |
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| is the "white" of the eye. It protects the inner part of the eye and serves as a surface for the attatchment of muscles. |
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FUNCTION OF THE OPTIC NERVE
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| located at the back of the eyeball, it carries nerve impulses from the retina to the brain. |
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FUNCTION OF THE VITREOUS HUMOR
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| Is a jelly like substance which fills the interior of the eyeball, the pressure of the vitreous humor against the inner layers of the tissue maintains the shape of the eyeball |
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| almost circular structure toward the front of the eye the lens changes shape to focus an image on the retina by bending light |
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| A hole within the dark-colored circular structure (the iris) it is between the cornea and the lens. It allows light to enter the eyeball |
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| its a dark colored circular structure immediately surrounding the pupil. this part of the eye is made of involuntary muscles that control the amount of light entering the eye by changing the size of the pupil. |
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FUNCTION OF THE ANTERIOR CHAMBER
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| space between the cornea and the iris, this chamber contains the aqueous humor, a fluid which maintains the shape of the cornea |
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FUNCTION OF THE CILIARY BODY
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| surrounds the lens, it is a black circular structure with grooves and contains muscles which focus the lens by changing its shape |
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| a dark pigmented layer against the inner side of the sclera, it contains the blood vessles that supply nutrients to the eyeball |
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| innermost layer of the eye, filmy yellowish tissue. loosely attatched to the choroid. The retina contains the receptors called rods and cones that are stimulated by light and start the impulses that will travel to the optic nerce and then to the brain. |
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FUNCTION OF THE TAPETUM LUCIDUM
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| Its a shiny greenish or blue layer which covers pary of the choroid. It reflects light and causes the eye of some animals to "shine" at night animals that have this layer can see better at night than a human. Humans do not have this layer. |
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