Eyeball Development: Lens

Question 1

Formation

Answer 1

1. Formed on surface as ectodermal thickening called lens placode
2. Induced by optic vesicle
3. Placode is then converted into lens vesicle which sinks into underlying mesoderm where it is surrounded by optic cup margin

Question 2

Cells of lens development

Answer 2

1. Posterior wall differentiate to form primary lens fibers
2. Elongation of these cells transforms posterior wall into rounded lens body, obliterating lens vesicle cavity

Question 3

Primary lens fibers

Answer 3

Augmented by new population of secondary lens fibers which arise from simple epithelium that differentiates from cells of lens vesicles anterior wall

Question 4

Fetal life lens capsule

Answer 4

Supplied by hyaloid artery but after birth artery degenerates and lens becomes avascular

Question 5

Fetal life capsule

Answer 5

Supplied by hyaloid artery but after birth artery degenerates and lens becomes avascular