Anatomy of conjuctiva. How many types of conjuctiva
Superficial epi- stratified squamous ( lid margin +limbus)+ columnar( bulbar conj)
No keratin so needs lube to prevent drying
2-7 layers
Loose ct stroma
2 layers: adenoid (superficial) and fibrous (deep)
Fibrous = collagen, thicker than adenoids, nerves and vessels
Accessory lac glands in Stroma ( krause, wolfring, henle, manze)
3 types:
Bulbar
Forniceal
Palpebral
Role of conjunctiva
Protect
Lubricate
Nourish
Mucous production ( tear fim) by conjuntival goblet cells
What traps debris in palp conjunctiva
Subtarsal sulcus
describe forniceal conj
Continuous with medial and lat canthi
So CL can't go behind eye
Loose attachment
describe bulbar conj
Covers sclera
Radial ridges = palisades of Vogt
2 landmarks: plica semi ( mucus secretion and immune response) + caruncle
Conj arterial supply
Sup and inf palp art arches
Post conj art >> ant conj art
Ant cil artery
Venous drainage of conj
Drain into palp veins 》》 Opthalmic veins》》 cavernous sinus
Conjunctival innervation
Palp + forniceal- trigeminal nerve (5th)
Bulbar - long ciliary nerves
What is the lining that covers all bones of orbit
Periorbita/ periosteum
fascial sheath landmarks1.
Muscular fascial sheath- surrounds EOM
Med&lat check ligaments
Suspensory lig of lockwood
Function of sclera
Protection
Structural support
Light proof
Scleral stytructure
Type 1 collagen
Dense, irregular shape so opaque
3 layers :
Episclera- rich vasc supply
stroma- strength, fibroblasts & melanocytes
lamina fusca- pigmented, grooved channels for cil bld vessels and nerves, connected to choroid
Last changed6 months ago
