BIO 281 CH 8: special senses

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Eyebrows

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Biology

30 Terms

1

Eyebrows

shades eyes from sunlight, prevent perspiration from eyes

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2

Eyelids

protects from foreign objects and prevent drying

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3

Conjunctiva

produces lubricating & cleansing fluid

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4

what cranial nerve controls accessory structures of the eye? (ex. eyebrows, eyelid, conjunctiva)

cranial nerve 7

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5

Lacrimal Gland

exocrine gland, secretes tears (mucus, antibodies, antibacterial enzymes protecting eyes from infection) to moisten eyes

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6

3 layers of eye tissue

  • fibrous tunic

  • vascular tunic

  • sensory tunic

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7

Fibrous Tunic

  • outermost layer

  • connective tissue w/ min. blood vessels 2 regions = sclera and cornea

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8

Vascular Tunic (uvea)

  • middle layer

  • thin connective tissue w/ numerous capillaries

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9

Sensory Tunic (retina)

  • innermost layer

  • 2 layers of tissue - outer pigment layer, inner neural layer

  • 2 types of photoreceptors: rods and cones (colors)

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10

anterior layers of the eye

cornea and cillary body

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11

posterior layers of the eye

sclera, choroids, retina

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12

cornea function

light transmission & refraction

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13

Ciliary body

Iris: accommodation, controls light intensity

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14

Sclera

protection (outer layer)

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15

Choroids

blood supply, pigment prevents reflection (middle layer)

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16

Retina

(inner layer): photoreception & impulse transmission

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17

Pathway of light

cornea → aqueous humor → lens → vitreous humor → retina

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18

refraction

Bending of light

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19

Lens must ___ to focus on ___ objects

thicken; close

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20

Superior rectus:

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21

Lens ___ for distant vision

flattens

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22

Lens ___ for close vision

bulges

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23

In close vision, ciliary muscle ___, lens ligaments ___, lens more ___.

contracts; relax; convex

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24

In distant vision, ciliary muscle ___, lens ligaments ___, lens more ___.

relax; contracts; concave

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25

superior rectus muscle

rotates eye up and in

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26

inferior rectus muscle

rotates eye down and in

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27

medial rectus muscle

rotates eye inward

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28

lateral rectus muscle

rotates eye out

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29

superior oblique muscle

rotates eye down and out

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30

inferior oblique muscle

rotates eye up and out

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