10.9

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DesLee26
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140425
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10.9
Updated:
2012-03-07 23:07:16
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Anatomy Physiology
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Seniors
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  1. Sense of Sight
    A. __ organs, namely the __, __, and __, aid the __ in its function.
    • Acessory
    • lacrimal aparatus
    • eyelinds
    • extrinsic muscles
    • eye
  2. Visual Accessory Organs
    1) What does teh eyelid do?
    2) The __ produces __ that __ and __ the eye.
    2a) Two small __ drain tears into the __.
    2b) Tears also contain an __ enzyme called __.
    3) The __ of the eye attach to the __ and move the eye in all directions.
    • 1) protects the eye from foreign objects and is made up of the thinnest skin of the body lined with conjunctiva
    • 2) lacrimal apparatus/ tears/ lubricate/ cleanse
    • 2a) ducts/ nasal cavity
    • 2b) antibacterial/ lysozyme
    • 3) extrinsic muscles/ sclera
  3. C. Structure of the Eye
    1) The eye is a __-filled __ sphere with __ distinct layers, or __.
    • fluid
    • hollow
    • three
    • tunics
  4. The Outer Tunic
    a) The outer (__) tunic is the __ at the front of the eye, and the __ of the anterior eye.
    b) The __ and __ pierce the __ at the __ of the eye.
    • a) fibrous/ transparent cornea/ white sclera
    • b) optic nerve/ blood vessels/ sclera/ posterior
  5. The Middle Tunic
    a) The middle, __ tunic includes the __, __, and __.
    b) The __ is highly __ and __ pigmented and performs two functions: __(2)__
    c) The __ forms a ring around the front of the eye and contains __ and __ that hold the __ in position and change its shape (__).
    • a) vascular/ choroid coat/ ciliary body/ iris
    • b) choroid coat/ vascular/ darkly/ (1) to nourish other tissues of the eye and (2) to keep the inside of the eye dark
    • c) ciliary body/ ciliary muscles/ suspensory ligaments/ lens/ focus
  6. The Outer Tunic cont.
    d) The ability of the lens to adjust shape to facilitate focusing is called __.
    e) The __ is a thin, smooth muscle __ that adjusts the amount of light entering the __.
    f) The __ (between the __ and __) and the __ (between the __ and __ and __) make up the __, which is filled with __.
    g) The __ circulates from one chamber to the other through the __.
    • d) accommodation
    • e) iris/ diaphragm/ pupil
    • f) anterior chamber/ cornea and iris/ posterior chamber/ iris and vitreous body adn housing the lens/ anterior cavity/ aqueous humor
    • g) aqueous humor/ pupil
  7. The Inner Tunic
    a) The inner tunic consists of the __, which contains __; the inner tunic does what?
    b) In the center of the __ is the __ in its center, the point of sharpest vision in the retina.
    c) Medial to the __ is the __, where nerve fibers leave the eye and where there is a __.
    d) The large __ of the eye is filled with __.
    • a) retina/ photoreceptors/ covers the back side of the eye
    • b) retina/ fovea centralis
    • c) fovea centralis/ optic disk/ blind spot
    • d) posterior cavity/ vitreous humor
  8. D. Light Refraction
    1) __ must bend to be focused, a phenomenon called __.
    2) Both the __ and __ bend __ that are focused on the __.
    • 1) Light waves/ refraction
    • 2) cornea/ lens/ light waves/ retina
  9. E. Visual Receptors
    1) Two kinds of modified neurons comprise the __: __ and __.
    2) __ are more sensitive to light and function in __; they produce __ vision.
    3) __ provide sharp images in __ and enable us to see in __.
    3a) To see something in detail, a person moves the eyes so the image falls on the __, which contains the highest concentration of __.
    • 1) visual receptors; elongated rods/ blunt-shaped cones
    • 2) Rods/ dim light/ colorless
    • 3) Cones/ bright light/ color
    • 3a) fovea centralis/ cones
  10. F. Visual Pigments
    1) The light-sensitive pigment in rods is __, which breaks down into a protein, __, and __ (from __) in the presence of __.
    1a) __ of __ activates an enzyme that initiates changes in the __, generating a nerve impulse.
    1b) Nerve impulses travel away from the __ and are interpreted as __.
    2) The light- sensitive pigments in cones are __; there are __ sets of cones, each containing a different visual pigment.
    2a) The __ of light determines the __ perceived from it; each of the __ pigments is sensitive to different __ of light.
    2b) The __ perceived depends upon which sets of cones the light stimulates: if all three sets are stimulated, the color is __; if none are stimulated, the color is __.
    • 1) rhodopsin/ opsin/ retinal/ vitamin A/ light
    • 1a) decomposition/ rhodopsin/ rod cell membrane
    • 1b) retina/ vision
    • 2) isodopsins/ three
    • 2a) wavelength/ color/ three/ wavelengths
    • 2b) color/ white/ black
  11. G. Visual Nerve Pathways
    1) The __ leave the eyes to form the __.
    2) Fibers from the __ half of the __ cross over in the __.
    3) Impulses are transmitted to the __ and then to the __ of the __ lobe.
    • 1) axons/ optic nerves
    • 2) medial/ retina/ optic chiasma
    • 3) thalamus/ visual cortex/ occipital

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