Orbit And Contents Flashcards
Medial wall is thinner
And base and lateral wall have thicker bones
Bulba conjuctiva
Palpebral conjuctiva
Melbomian gland
Melbonian gland
Barrier to prevent tears from spreading beyond eyelids
Canchus
Aqeuos chamber and glassy chamber
Sclera has more collagen and less hydrated
Cornea is has regular arrangement of collagen and hydrated
Limbus junction
Which bones form the floor of the orbit?
Zygomatic bone
Maxillary bone
Palatine bone
Which bones form the
Which bones form the medial wall of the orbit?
Lesser wing of sphenoid
Lacrimal bone
Orbital plate of ethmoid
Frontal process of the maxillary bone
Which bones form the roof of the orbit?
Frontal bone
lesser wing of the sphenoid bone
Which bones form the lateral wall of the orbit?
Zygomatic
Greater wing of sphenoid
What forms the apex the orbit?
Optic canal
Contents of the superior orbital fissure
Lacrimal nerve
Optic nerve
Superior branch and inferior branch of the ophthalmic veins
Superior branch and inferior branch of occulomotor nerve
Nasociliary nerve
Abducens nerve
Frontal nerve
Ophthalmic artery
Contents of the tendinous ring
Abducens nerve
Nasociliary nerve
Optic nerve
Ophthalmic artery
Superior and inferior branch of occulomotor nerve
The orbital sheaths of the eyeball
Periorbita / orbital fascia
Tenon’s capsule
Orbital fat herniation or prolapse
The protrusion of orbital fat outside normal position
Posterior perforations in the sclera for the passage of vessels is called
Lamina cribrosa of sclera
He fibrous tunic of the eyeball comprises of
Sclera and cornea
Where is the canal of Schlemm found?
The corneo- sclera junction
What is the function of the canal of Schlemm?
It drains aqueous fluid into the venous system
The vascular tunic comprises of
Choroid
Ciliary body
Iris
The ciliary muscle is supplied by which nerve?
Occulomotor nerve
Which part of the vascular tunic produces aqueous fluid?
Ciliary body
What is the autonomic nerve supply to the sphincter pupillae muscle?
Parasympathetic supply
Which autonomic nervous system supplies the dilator pupillae muscle
Sympathetic innervation
What is the most sensitive part of the retina?
Fovea centralis
The posterior aqueous chamber is the area between
The iris and the lens
The anterior aqueous chamber is the area between the
The cornea and the iris
Glaucoma
Caused when there is an overproduction of aqueous fluid which leads to increased intraocular pressure
The two parts of the conjunctiva
Palpebral conjunctiva
Orbital conjunctiva
Nerve supply to the lacrimal apparatus is from
Pterygopalatine ganglion
Nerve supply to the conjunctiva
Lacrimal nerve
Nerve supply to the eyelids
Lacrimal nerve
Supratrochlear
Infratrochlear
Supraorbital
Check superior tasal innervated by the sympathetic fibers from the T1 segment
