Lamina papyrecea It separates the orbit from the nasal cavity, the ethmoidal and the sphenoidal sinuses Lateral Wall Zygomatic & Sphenoid (greater wing) Stronger wall
It separates the orbit from the (temporal fossa) and the brain Roof Medial wall
Floor IMPORTANT RELATIONS OF THE ORBIT 1. 2. 3.
4. 5. Brain Para nasal sinuses Nasal cavity Cavernous sinus
Pterygopalatine fossa Orbit as seen from above Relations of the orbit to the paranasal sinuses :FS, frontal sinus; ES, ethmoidal sinus; MS , maxillary sinus; SS, sphenoid sinus- American Academy of Ophthalmology
CONTENTS OF THE ORBIT 1. Eyeball & the optic nerve 2. Muscles To move the eyeball. 3. Nerves
To move the muscles ( III, IV, VI). To carry different sensations ( V) parasympathetic innervation ( accommodation, pupillary constriction & lacrimal gland stimulation
Sympathetic innervation ( pupillary dilatation, vasoconstriction, smooth muscles of the eye lids & hidrosis) CONTENTS OF THE ORBIT 4. Blood vessels ( branches of ophthalmic artery, superior & inferior ophthalmic
veins) 5. Fat & orbital fascia For padding purposes & for smooth movements 6. Most of the Lacrimal Apparatus (lacrimal gland & part of the tear drainage system) Lacrimal gland and the
view of the orbit from the roof Orbital fascia
Periorbita Orbital septum Tenons capsule Fascial spaces intraconal
extraconal subtenon subperiosteal Subperiosteal space Extraconal
space Intraconal space Structure of the lids-AAO RADIOGRAPHIC ANATOMY OF THE
AXIAL CT SCAN Summary Orbit is the protective casing for the delicate visual apparatus - the eyeball It is made up of 7 bones, has 4 margins,
4 walls/ boundaries, 4 important openings , 5 important relations & 6 contents Infection can spread to the brain from the orbit directly or through the haematogenous spread- Orbital septum is a barrier to infection Trauma mostly damages the medial wall
& the floor (the weakest parts give way) The symptomotology of orbital diseases is reflective of its clinical anatomy
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