THE ORBIT & ITS CONTENTS

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THE ORBIT & ITS CONTENTS

Prof. Dr. Selda Önderoğlu

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Bony Orbit

4 sided pyramid Walls

Sup. / inf.

Med. / lat.

Apex Base

Periorbita

Continuous with dura at optic canal

& sup. orbital fissure

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Prof. Dr. H. Selçuk Sürücü

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Borders of Orbital Margin

Infraorbital:

Zygomatic b Maxilla

Medial:

Frontal process of maxilla

Supraorbital:

Frontal b Lateral:

Orbital part of zygomatic b

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Walls of the Orbit

Inferior:

orbital surfaces of maxilla

& zygomatic b

orbital process of palatine b

Medial:

frontal process of maxilla

lacrimal b

orbital plate of ethmoid b

body of sphenoid

Superior:

orbital part of frontal b

lesser wing

Lateral:

greater wing

orbital surface of frontal b

zygomatic b

Ethmoidal foraminae

Lacrimal cristae

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Superior orbital fissure :

Middle cranial fossa Inferior orbital

fissure:

Temporal &

infratemporal fossae Optic canal

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middle cranial fossa

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Accessory Orbital Structures

Extraocular mm Eyebrows

Eyelids (palpebra) & tarsi Orbital fasciae

Conjunctiva

Lacrimal apparatus

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eyebrows

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4 Rectus muscles

O: Common tendineus ring (Zinn) I:

Eyeball

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Medial check lig.

Lateral check lig

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Levator palpebra superioris m

O: Ant aspect of optic canal, lower surf of lesser wing I: Ant surf of skin & tarsus of upper eyelid

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Sup oblique m

O : Body of

sphenoid b, upper-medial part of optic canal

I :

Lateral part of eyeball

posteriorly)

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Inf oblique m

O:

Post lacrimal crest

I:

Eyeball

(posteriorly)

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LR

₆

(SO

₄

)

₃

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Orbital m

Closes the sup orbital fissure

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Eyelids

Palpebral opening Ant border

Eyelashes (cilia) Ciliary glands

Post border

Sup & inf lacrimal papilla

& punctum lacrimale Tarsal glands

Commissures Med > lat angle

Lacrimal caruncule (medial)

Semilunar fold (medial) Lacrimal lake(medial)

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EYELIDS

Layers of the eyelid

SkinSubcutaneus tissue Orbicularis oculi m Levator palpebra sup tendon

Sup tarsal m Sup tarsus

Orbital septum Tarsal glands Palpebral

conjunctiva

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Conjunctiva

Palpebral Bulbar

Sup & inf

fornices

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Fascial sheath of eyeball (Tenon)

Episcleral space

The fasciae of orbit

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Check ligaments

Insert to lacrimal & zygomatic bb

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Central retinal a Post ciliary aa

Lacrimal a

zygomatic br lat palpebral a ant ciliary a

Supraorbital a Post ethmoidal a Ant ethmoidal a Medial palpebral a Supratrochlear a Dorsal nasal a

Mainly : from ophthalmic artery

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Branches of ophtalmic n

Lacrimal n Frontal n

Supratrochlear n Supraorbital n

Nasociliary

Ant ethmoidal n

Posterior ethmoidal n Infratrochlear n

Long ciliary nn

Communicating br to ciliary gang

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Frontal &lacrimal n.

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Nasociliary n.

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Lacrimal apparatus

Lacrimal gl

Palpebral part: 7-8 ducts Orbital part: 4-5 ducts

Lacrimal canaliculi Lacrimal sac

Nasolacrimal duct Nasal cavity

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orbital

palpebral