Flashcards in Exam 1 Remington Episclera and Sclera, Tenon's Capsule, Bulbar, and Limbus Deck (29)
Where is the location of the sclera?
Posterior 5/6 of globe
What is the cellular composition of the sclera?
Dense irregular CT, avascular
The sclera is continuous with what?
What is the difference between the sclera and the corneal stroma?
Sclera has fewer GAG, less regular pattern of fibers
What does a white sclera mean?
What does a blue sclera mean?
Thin or transparent
What does a yellow sclera mean?
With fat deposits or liver dysfunction
What is the anterior scleral foramina?
What is the posterior scleral foramina?
Optic nerve, lamina cribrosa
What is the lamina cribrosa?
Meshwork of scleral fibers
What are the anterior apertures of the sclera?
Near the limbus, anterior ciliary arteries
What are the middle apertures of the sclera?
Near the equator, vortex veins
What are the posterior apertures of the sclera?
Around the optic nerve, long and short posterior ciliary arteries and nerves
Where is the location of the episclera?
Outer to the sclera
What is the composition of the episclera?
Loose vascular CT
What is Tenon's capsule?
Dense CT capsule, outer to episcleral
Where is the location of the bulbar conjunctiva?
Outer to Tenon's capsule, continuous with palpebral conj at fornices
What is the cellular composition of the bulbar conjunctia?
Stratified non-keratinizaed columnar epithelium, contains goblet cells
What is the composition of the bulbar conjunctiva stroma?
The stroma is called the submucosa. It is immunologically active and contains blood vessels and lymphatics
Involves deeper ciliary vasculature and is somewhat purple in color
Involves more superficial vessels
What is the location of the limbus?
Annular region surrounding corneal periphery
What is the width of the limbus?
1.5-2 mm in width
What is the anterior border of the limbus?
Line drawn from termination of Bowman's to termination of Descemet's
What is the posterior border of the limbus?
Line from the posterior scleral spur to conj surface and perpendicular to it
What are the 3 landmarks of the limbus?
External scleral sulcus, internal scleral sulcus, and Palisades of Vogt
Where is the location of the trabecular meshwork and Schlemm's canal?
Internal scleral sulcus
What are the Palisades of Vogt?
Grey "pegs", regions of thickened epithelium considered "niche" for corneal and conjunctival stem cells, contain BVs and melanocytes