- folds, skin - covers eye - when closed

- thin, transparent mucous membrane - covering sclera in - exposed front, eyeball

homeostasis - eye Flashcards by Hing Chi Shan (Nchs)

where in eye does conjunctiva encompass

1 layer, covering whole white color part, eye

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optic nerve has sensory or motor neurone?

both

i.e.
sensory neurone in the optic nerve

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label all parts of front view (eye)

https://docs.google.com/document/d/1LQacTU0A416kWYxp3Du0-mVf9HBosNswJ_jQ2zTk5X0/edit?tab=t.0
page 27

https://docs.google.com/document/d/1LQacTU0A416kWYxp3Du0-mVf9HBosNswJ_jQ2zTk5X0/edit?tab=t.0 page 28

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label all parts of horizontal longitudal section (eye)
https://docs.google.com/document/d/1LQacTU0A416kWYxp3Du0-mVf9HBosNswJ_jQ2zTk5X0/edit?tab=t.0 Page 29

https://docs.google.com/document/d/1LQacTU0A416kWYxp3Du0-mVf9HBosNswJ_jQ2zTk5X0/edit?tab=t.0
page 30

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eyelid struct

folds, skin
covers eye
when closed

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eyelashes struct

row
hair lining eyelid

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tear gland struct

glandular cells located
upper corner
eye ball

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conjuctiva struct

thin, transparent mucous membrane
covering sclera in
exposed front, eyeball

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sclera struct

white, opaque, fibrous
eyeball outer layer
continuous with
cornea

sclera
fiborous -> all tough stuff are

opaque -> thats why those that are blind, eye is all white. Only black part can see, coz white part is opaque.

Cornea covers + continuous w/ eyeball
Conjunctiva covers only sclera

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cornea struct

transparent outer layer of eyeball
- continuous w/ sclera
- cornea covers iris, pupil, aqueous chamber

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iris struct

muscular structure, contains:
2 sets antagonistic muscles
- circular, radial muscles

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aqueous chamber struct

space between cornea,
lens
- filled w/ aqueous humor

aqueous haha

what a design.
hahaha.

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lens struct

BENTO

Biconvex
Elastic
(None)
Transparent
Ovoid

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suspensory ligament struct

fibrous connective tissue

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cillary body struct

contain ciliary muscles

cillary body is not cillary muscles.
it CONTAINS

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retina struct

innermost layer eyeball
contains photoreceptors

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fovea struct

small yellow depression in retina
- greatest conc. cones
- no rods

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blind spot struct

area of retina
- optic nerve leave eye

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optic nerve struct

cranial nerve
- contain neurons

cranial nerve near brain head neck e.g. but for olvls sake, if ask nerve impulse transmission unless special nerves like optic PLS do not write cranial write sensory/motor/relay

optic nerve contain neurons.

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choroid struct

middle layer eyeball
- pigement black high vascularised

Vascularised -> a lot blood vessels

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vitreous chamber struct

space behind lens
surround by retina
filled w/ vitreous humor

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why does a damn folds of skin covering eye have 3 functions

eyelid funct

Study These Flashcards

protect cornea from dmg

prevent excessive light enter eye

blink, spread tears over cornea

row hairs lining eyelid

funct

Study These Flashcards

shield eye
dust particle

tear gland funct

Study These Flashcards

secrete tears
wash dust particles
lubricate conjunctiva
reduce friction (eyelid movement)

conjunctiva funct

secrete mucus keep exposed front eyeball moist

sclera funct

protect eyeball mechanical dmg

cornea funct

refracts light into pupil - accounts for most - refraction of light in eye

iris funct

controls amount light entering eye

pupil funct

allows light enter eye

aqueous chamber funct

filled w/ **aqueous humor** - transparent, watery fluid - keep front of eyeball firm - refract light into pupil

lens funct

refract light -> retina

suspensory ligament funct

attaches edge, lens -> ciliary body

cillary body/muscles funct ## Footnote recap: cillary **body** contain cillary **muscles**

control lens' - thickness - curvature allow **accomodation**

retina funct

photoreceptors, retina - detect light, stimulated - generate nerve impulses, transmit thru **sensory neurons in optic nerve** 2 brain ## Footnote CNS automatically brain, coz its above neck Optic Nerve is part of **Cranial Nerves**

fovea funct

enables detailed colour vision in bright light

cones

photoreceptors enable color vision

blind spot funct

dosen't contain any photoreceptors insensitive 2 light

optic nerve funct

**SENSORY NEURONES IN ~** transmit nerve impulse -> brain when photoreceptor in Retina stimulated ## Footnote CNS is automatically **brain** coz its above neck also part of **Cranial Nerves**

choroid funct

- prevents internal reflection, light - contains blood vessels, transport oxygen, nutrients -> eyeball, remove **metabolic waste**

vitreous chamber funct

contain **vitreous humor** - transparent, jelly like substance - keep eyeball firm - refract light -> retina ## Footnote cousin of cytoplasm

**Fill in Blanks (Pupil Reflex)** Photoreceptors in the retina of the eye ___, generate nerve impulses

detect increased/decreased light intensity

**Fill in blanks (Pupil Reflex)** Nerve impulses pass across another synapse -> motor neuron (transmits nerve impulses from brain)...

-> effector muscles in iris **via optic nerve** iris circular muscles contract, radial muscles relax, cause pupil constrict/dilate decrease/increase **amt light** entering eye

define accomodation

**adjustment -> curvature of lens** clear images objects, different distances, form on retina

**Fill in blanks (Accomodation)** ___ photoreceptors in retina, generate nerve impulses

blur image stimulates

**Fill in blanks (Accomodation)** The motor neuron transmits nerve impulses from the brain ___

via optic nerve -> effector ciliary muscles, ***eye***

**Fill in blanks (Accomodation)** C__ M__ (Distant Object)

**Cillary Muscles** Relaxes

**Fill in blanks (Accomodation)** C__ M__ (Near Object)

**Cillary Muscles** Contracts

**Fill in blanks (Accomodation)** S__ L__ (Distant Object)

**Suspensory Ligament** Taut

**Fill in blanks (Accomodation)** S__ L__ (Near Object)

**Suspensory Ligament** Slackened

# Thickness, Shape, Focal Length **Fill in blanks (Accomodation)** L___ (Distant Object)

**Lens** - Thinner - Less convex - Increase focal length

**Fill in blanks (Accomodation)** L___ (Near Object)

**Lens** - Thicker - More convex - Decrease focal length

**Fill in the blanks (Accomodation)** Light rays (Distant Object)

**Parellel Light Rays** focused sharply, retina ## Footnote End goal of light rays = Sharp focus on retina = Clear image

**Fill in the blanks (Accomodation)** Light rays (Near Object)

**Diverging Light Rays** focused sharply, retina ## Footnote End goal of light rays = Sharp focus on retina = Clear image

how sharp image allow seeing of image

sharp image stimulates photoreceptors in retina, generate nerve impulses transmit -> brain, interprets nerve impulses, allows seeing, obj

homeostasis - eye Flashcards

(54 cards)