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ANATOMY OF THE EYE
http://www.innerbody.com/image/nerv08.htmlhttp://www.innerbody.com/image/nerv08.htmlhttp://www.innerbody.com/image/nerv08.html
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ANATOMY OF THE EYE
The wall of the eye ball composed of a dense elasicsupporting
:
- Anterior part (transparent) Cornea- Anterior part covered the
sclera conjunctiva- Junction between Cornea & conjunctiva
limbus
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EYE BALL LAYERS
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TEAR FILMLipid : prod. by meiboman gland
F/ tear evaporation, tear stability
Aquous: prod. By lacrimal glandF/ Transport all water
soluble nutriensMucin : prod. by conjunctival
goblet cellF/ ability aquous layer
to spread throughcorneal epithel
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CORNEAL LAYEREPITHELIUM:
Continuation of the con-junctiva over the corneaBowmans
Layer
STROMA
Forming 90 % of totalCornealDescemet MembraneThin elastic
membrane
covered on its posterior byEndotheliumEndotheliumControling
stromal hydration,become less in number of age
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Anterior Chamber
Ant. Camber : space filled with aquous humorBorder : - anterior
: cornea
- posterior : iris
Muscle controlled iris movement- Sphincter pupillae
circular bundle running round the pupillary margin, suppliedby
parasimpatic N. III
- Dilator pupillaerun radially near the root of iris, suplied by
motor
nerve fibers derived from cervival sypathetic chain
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TRABECULAR MESHWORK &AQUOUS FLOW
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Aquous flow
Aquous formed in ciliarry region
Secreted to the posterior chamber
Through the pupil
Anterior chamber
Escapes trough the drainage channelsEpiscleral vein
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Lens : biconves mass surounded by hyaline membrane ( lens
capsule,held by suspensory ligament ( zonules zinii)
THE LENS
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DURING ACCOMODATION
THE CILIARY MUSCLES CONTRACTS
DRAWING TOWARD THE CHOROID
RELAXING THE SUSPENSORY LIGAMENT
DIMINISHES THE TENSION OF LENSCAPSULE
INCREASE THE CONVEXITY OF THE LENS
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CONSIST 3 PARTS :
-THE CHOROID,- CILIARY BODY,-THE IRIS
UVEAL TRACT
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THE RETINA CONSISTS OF 10 LAYERS
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FOVEA : THE MOST
SENSITIVE PART OF THERETINA, SURROUNDED BYA SMALL AREAS,
THEMACULA LUTEA ORYELLOW SPOT.
AT THE OPTIC DISC THEFIBERS OF THE NERVE-FIBER LAYER PASS
INTOTHE OPTIC NERVE
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VITREOUS
vitreous cavity : expanded extracellular space,normally contains
4.0 ml of clear gelatinoussubstance, composed largely of
water,hyaluronic acid, and collagen.
Vitreousbase
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THE EXTRA OCULAR MUSCLES
Extra Ocular Muscle
THE RECTUS MUSCLE- THE MEDIAL RECTUS
- THE LATERAL RECTUS
- THE SUPERIOR RECTUS
- THE INFERIOR RECTUS
THE OBLIQUE MUSCLE
- THE SUPERIOR
OBLIQUE- THE INFERIOR
OBLIQUE
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RECTUS MUSCLESROTATING THE EYEIN FOUR CARDINALDIRECTIONS :
UP,DOWN, OUT AND IN
THE OBLIQUE
MUSCLESROTATIONOF THE GLOBE
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THE EYE LIDS
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THE SKIN OF THE LIDS
IS THE THINNES AND
ITS LOOSE ATTACH-
MENT
THE CILIA OR
EYELASHES ARE
STRONG SHORT
CURVED HAIRS,
ARRANGED IN TWO OR
MORE CLOSELY SET
ROWS
THE SEBACEOUS
GLANDS ARE CALLEDZEISSS GLANDS AND
THE SWEAT GLANDS
ARE KNOWN AS MOLLS
GLANDS
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THE TARSUSCONSISTS OFDENSE
FIBROUSTISSUE; ITCONTAINS NOCARTILAGE,EMBEDDED IN
IT ARE SOMEENORMOUSLYDEVELOPEDSEBACEOUSGLAND : THE
MEIBOMIANGLANDS
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Orbicularis Palpebra :-Occupies space between
tarsus skin- Suplied by N. VII
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THE LACRIMAL APPARATUS
THE LACRIMAL APPARATUS CONSISTS OF
THE LACRIMAL GLANDS
THE LACRIMAL PASSAGES
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TEAR FLOWS
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