Term
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Definition
Electrochemical - hardwired.
1. Inborn, intrinsic, rapid, predictable motor response to a stimulus.
2. Unlearned and involuntary. |
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Term
| What are the accessory structures of the eye? |
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Definition
Eyebrows -
Eyelids -
Conjuctive -
Lacrimal Apparatus - |
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Term
| What are the 3 Tunics of the eye? |
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Definition
Fibrous Tunic.
Vascular Tunic.
Sensory Tunic. |
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Term
| What is the Fibrous Tunic? |
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Definition
The Fibrous Tunic is the outermost coat and is made up of dense irregular tissue.
Sclera.
Cornea. |
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Term
| What is the Vascular Tunic |
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Definition
Choroid.
Ciliary Body.
Iris |
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Term
| What is the Sensory Tunic? |
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Definition
Retina
Outermost is the Pigmented Layer - absorbs the light
Inner layer is the neural layer - Photoreceptors, rods and cones/ |
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Term
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Definition
Part of the Fibrous Tunic.
Dense irregular connective tissue - strong and tough.
Avascular |
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Term
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Definition
Part of the Fibrous Tunic.
Attachment site for the 6 extrinsic muscles. |
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Term
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Definition
Part of the Vascular Tunic.
Heavily vasculaized.
Provides nutrients to the layers. |
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Term
| What is the job of the Ciliary Muscle? |
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Definition
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Term
| Describe the Vitreous Humor |
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Definition
Gell like fluid.
Holds the retina against the choroid.
Shapes the eye and as we get old, we loose the fluid and our eyes change shape. |
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Term
| Describe the Iris and its different muscle layers. |
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Definition
The Iris controls the amount of light that enters the eye.
Circular layer - sphincter - parasypathetic.
Dialator muscle - sympathetic. |
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Term
| What's up with refraction? |
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Definition
The bending of light.
Because of changes in speed of light, bending occurs when it meets the surface of the eye at an oblique angle rather that a right angle. |
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Term
| What are the 6 extrinsic muscles of the eye? |
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Definition
Lateral, Medial, Superior and Inferior Rectus muscles.
Superior and Inferior Obliques. |
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Term
| How does the eye control the amount of light that enters the eye? |
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Definition
By changing the size of the pupil.
Sphincter muscle contracts. |
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Term
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Definition
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Term
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Definition
C C C
Close Vision, Convex lense, Ciliary muscle contracts and suspensory muscles relax. |
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Term
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Definition
| Far sighted, Relaxed Ciliary muscle, taught suspensory ligaments. |
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Term
| Where is the posterior chamber and what fluid does it contain? |
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Definition
| Between the iris and lense and it is aqueous humor. |
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Term
| What are the functions of the Ciliary Body? |
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Definition
To make aqueous humor.
To change the shape of the lense. |
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Term
| What is the function of the Iris? |
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Definition
| To control the size of the pupil, therefore, controlling the amount of light entering the eye. |
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Term
| What are 2 types of photoreceptors? |
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Definition
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Term
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Definition
At the optic disc.
It is the place where the optic nerves leave the retina. The are NO photoreceptors. |
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Term
| Highest concentration of cones is.... |
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Definition
| Found in the Fovea Centralis |
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Term
| What is the most anabolic tissue in the body? |
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Definition
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Term
| What happens to photo pigment molecules that absorb light? |
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Definition
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Term
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Definition
Short vision = nearsighted
Objects focus on the FRONT of the retina instead of on the back.
Far objects are blurred. |
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Term
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Definition
Farsighedness.
Focus is behind the retina.
Close objects are blurred. |
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Term
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Definition
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Term
| Describe the relationship between Rods and Cones. |
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Definition
Cones - color: Rods - Dimlight
When you enter a dark room, the cones stop working and rhodopsin starts accumulating in the rods increasing retinal sensitivity. |
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Term
| The closer we get to an object, the more.......of the lense |
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Definition
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Term
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Definition
Changes in the curvature of the lense to adjust for focusing.
This increases the refractive power of the lense/ |
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Term
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Definition
| Transparent mucous memebrane that lines the eyelids and the whites of the eyes. It produces a lubricating mucous that prevents the eye from drying out. |
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Term
| What controls the movement of the eye? |
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Definition
| The 6 extrensic eye muscles. |
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Term
| How many times is light bent before entering the eye? |
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Definition
| 3 times. At the Cornea, on entering and leaving the lens. |
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Term
| What makes up the "outer ear"? |
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Definition
| Pinna - External Auditory Canal |
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Term
| What makes up the "middle ear"? |
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Definition
| Tympanic cavity - it is a small, air filled, mucous lined cavity in the petrous portion of temporal bone. It is spanned by the auditory ossicles.. |
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Term
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Definition
| Malleous - Incus - Stapes. These are synovial joints. |
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Term
| What are the two Major inner ear divisions? |
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Definition
| The Bony labyrinth - Membranous labyrinth. |
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Term
| What makes up the "inner ear"? |
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Definition
| Vestibule - Semicircular canals - Cochlea. |
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Term
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Definition
| Central cavity of the bony labyrinth with membranous sacs suspended int he perilymph, the sccule and utricle/ |
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Term
| Define Semicircular canals. |
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Definition
| Equilibrium receptor region called crista ampullaris. |
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Term
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Definition
| Snail shaped - contains the scala vestibuli, scala tympani and if filled with perilymph. The cochlear duct filled with endolymph and has hair cell with are receptors for our hearing. |
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