Special Senses: Vision - apchute.com

1 NAME _____LAB TIME/DATE _____REVIEW SHEET exercise24 Special senses : VisionReview Sheet 24223 Anatomy of the five accessory eye structures that contribute to the formation of tears and/or aid in lubrication of the eyeball, and then name the major secretory product of each. Indicate which has antibacterial properties by circling the correct secretoryproduct. Accessory eyeball is wrapped in adipose tissue within the orbit. What is the function of the adipose tissue?What seven bones form the bony orbit? (Think! If you can t remember, check a skull or your text.) does one often have to blow one s nose after crying? the extrinsic eye muscle predominantly responsible for the actions described the eye the eye the eye up and the eye the eye the eye down and laterallyNAME _____LAB TIME/DATE _____lacrimal glandssaline solution; lysozymeconjunctivamucustarsal or meibomian glandsoily secretioncarunclewhitish, oily secretionciliary glandssweatTo package, protect, and cushion the eyeball in the bony tears drain into the nasal cavities via the nasolacrimal rectusmedial rectusinferior obliqueinferior rectussuperior rectussuperior obliqueighapmLre24pg223_230 5/12/04 2:27 PM Page 223 impos03 302:bjighapmL:ighapmLrevshts: is a sty?

2 Conjunctivitis? the terms listed on the right, correctly identify all structures provided with leader lines in the segmentcontaining body venous body inposterior segmentNotice the arrows drawn close to the left side of the iris in the diagram above. What do they indicate?224 Review Sheet 24 Blowup ofphotosensitiveretinaPigmentedepitheliu mjkihgfedcbalmnopqrstuThe flow of aqueous humor from the ciliary processes of the ciliary body to the scleral venous sinus (canal of Schlemm).Inflammation of a small oil or sweat gland associated with the eye of the 5/12/04 2:27 PM Page 224 impos03 302:bjighapmL:ighapmLrevshts: is a sty? Conjunctivitis? the terms listed on the right, correctly identify all structures provided with leader lines in the segmentcontaining body venous body inposterior segmentNotice the arrows drawn close to the left side of the iris in the diagram above.

3 What do they indicate?224 Review Sheet 24 Blowup ofphotosensitiveretinaPigmentedepitheliu mjkihgfedcbalmnopqrstuThe flow of aqueous humor from the ciliary processes of the ciliary body to the scleral venous sinus (canal of Schlemm).Inflammation of a small oil or sweat gland associated with the eye of the 5/12/04 2:27 PM Page 224 impos03 302:bjighapmL:ighapmLrevshts: the key responses with the descriptive statements that venous processes suspensory ligamentthe ciliary humor1. attaches the lens to the ciliary body2. fluid filling the anterior segment of the eye3. the white of the eye4. part of the retina that lacks photoreceptors5. modification of the choroid that controls the shape of the crystalline lens6.

4 Contains the ciliary muscle7. drains the aqueous humor from the eye8. tunic containing the rods and cones9. substance occupying the posterior segment of the eyeball10. forms the bulk of the heavily pigmented vascular tunic, muscle structures12. area of critical focusing and discriminatory vision13. form (by filtration) the aqueous humor, , ,14. light-bending media of the eye15. anterior continuation of the sclera your window on the world 16. composed of tough, white, opaque, fibrous connective iris is composed primarily of two smooth muscle layers, one arranged radially and the other of these dilates the pupil?

5 Would expect the pupil to be dilated in which of the following circumstances? Circle the correct response(s). brightly lit focusing for near dimly lit observing distant intrinsic eye muscles are under the control of which of the following? (Circle the correct response.)autonomic nervous systemsomatic nervous systemReview Sheet 24225m; suspensory ligamenta; aqueous humork; sclerai; optic discc; ciliary bodyc; ciliary bodyl; scleral venous sinusj; retinan; vitreous humorb; choroidc; ciliary bodyg; irisf; fovea centralisd; ciliary processes of the ciliary bodya; aqueous humore; corneah; lensn; vitreous humore; corneak; scleraThe radial layerighapmLre24pg223_230 5/12/04 2:27 PM Page 225 impos03 302:bjighapmL:ighapmLrevshts:layouts:Mic roscopic Anatomy of the two major layers of the retina are the epithelial and nervous layers.

6 In the nervous layer, the neuron populations arearranged as follows from the epithelial layer to the vitreous humor. (Circle all proper responses.)bipolar cells, ganglion cells, photoreceptorsphotoreceptors, ganglion cells, bipolar cellsganglion cells, bipolar cells, photoreceptorsphotoreceptors, bipolar cells, ganglion axons of the cells form the optic nerve, which exits from the the following statements by writing either rods or cones on each blank:The dim light receptors are the . Only arefound in the fovea centralis, whereas mostly are found in the periphery of the the photoreceptors that operate best in bright light and allow for color isual Pathways to the visual pathway to the occipital lobe of the brain consists most simply of a chain of five neurons.

7 Beginning with the pho-toreceptor cell of the retina, name them and note their location in the pathway.(1) (4) (2) (5) (3) field tests are done to reveal destruction along the visual pathway from the retina to the optic region of the brain. Notewhere the lesion is likely to be in the following cases:Normal Vision in left eye visual field; absence of Vision in right eye visual field: Normal Vision in both eyes for right half of the visual field; absence of Vision in both eyes for left half of the visual field: is the right optic tract anatomically different from the right optic nerve?

8 Dissection of the Cow (Sheep) modification of the choroid that is not present in humans is found in the cow eye? What is its function? 226 Review Sheet 24ganglionrodsconesrodsConesphoto receptor cell; retinaneuron; lateral geniculate nucleus of the thalamusbipolar cell; retinacortical neuron; occipital (visual) cortex of the ganglion cell; retinacerebral hemisphere(s)Right optic nerveRight optic tract (or right optic cortex)The right optic nerve contains fibers from theright eye only. The right optic tract contains fibers from the lateral aspect of the right eye and the medial aspect of the left lucidumTo reflect light that enters the eye, thus increasing light stimulation of the retina under dim light 5/12/04 2:27 PM Page 226 impos03 302:bjighapmL:ighapmLrevshts: does the retina look like?

9 At what point is it attached to the posterior aspect of the eyeball? V isual Tests and the terms in column B with the descriptions in column A:Column AColumn to focus for close (under 20 ft) to focus well on close objects (farsightedness) Vision due to unequal curvatures of the lens or movement of the eyes during focusing on close the following statements:In farsightedness, the light is focused 1the retina. The lensrequired to treat myopia is a 2lens. The near point increaseswith age because the 3of the lens decreases as we get older. Aconvex lens, like that of the eye, produces an image that is upside down and reversed from left to right. Such an image is called a terms from the key to complete the statements concerning near and distance distance Vision : The ciliary muscle is , the suspensory ligament is , the convexity of the lensis , and light refraction is.

10 During close Vision : The ciliary muscle is , the suspensory ligament is, lens convexity is , and light refraction is . why Vision is lost when light hits the blind spot. is meant by the term negative afterimage and what does this phenomenon indicate? Review Sheet yellowish white membrane. (Often becomes crumpled during dissection of the eye.) At the optic ; refractiona; accommodationd; emmetropiae; hyperopiaf; myopiab; astigmatismc; convergencebehindconcaveelasticityrealTh is area lacks to retinal function, anegative afterimage is a dark image of a bright object ( light bulb) that is seen when the eyes are closed after viewing the brightobject. It indicates that the rhodopsin pigments have been 5/12/04 2:27 PM Page 227 impos03 302:bjighapmL:ighapmLrevshts: your Snellen eye test results below:Left eye (without glasses) (with glasses) Right eye (without glasses) (with glasses) Is your visual acuity normal, less than normal, or better than normal?