EMBRYOLOGY

Question 1

Which structures derive from neuro-ectoderm? (3)

Answer 1

NEURO-ECTODERM –> NERVOUS STRUCTURES.

1. Retina (Neurosensory and RPE)
2. Optic nerves
3. Epithelial lining of iris and ciliary body.

Question 2

Which structures derive from surface ectoderm?

Answer 2

SURFACE ECTODERM –> clear outer coverings and tears.

1. Lens
2. Corneal and conjunctival epithelium
3. Lacrimal gland and nasolacrimal duct system

Mneumonic: “Let’s clean clear layers”

Question 3

Which structures derive from Neural Crest?

Answer 3

NEURAL CREST –> Supportive framework and FLOW.

“Some irritated cats took sharp claws everywehre”

Sclera
Iris Stroma
Corneal Stroma and Endothelium
Trabecular meshwork
Schlemm’s Canal
Connective tissue of orbit
Extraocular muscle (partially derived)

Question 4

What structures are derived from mesoderm?

Answer 4

Mesoderm: Muscules, Movement and Maintenance.

Many Eye Structures Bring Vital Support Always

Muscles: extaocular
Endothelial lining (of blood vessels)
Scleral blood vessels
Blood
Vitreous
Suspensory Fibres of Lens
Angle outflow apparatus

Question 5

Whats the difference between mittendorf’s dot and Bergmeister’s papilla?

Answer 5

Mittendof marks the lens - anterior attachment of hyaloid artery

Bergmeister papilla - posterior attachment of hyaloid artery.