Devt Of The Eye Flashcards
Optic vesicles come from which structure
Optic placode (grooves)
What structure is formed when the OPTIC VESICLES come in contact with SURFACE ECTODERM?
LENS PLACODE
The invagination of Lens Placodes forms which structure?
Lens Vesicle
Lens Vesicle is formed at what week?
Week 5
T/F
Lens vesicle detaches from ectoderm and lies in mouth of optic cup during the 8th week?
F. Former is true. Week is false. 5th week dapat.
Cells of posterior wall elongate and form the primary lens fibers that reach anterior wall
This happens during what week?
5th week
At which week are the secondary lens fibers added to the central core?
5th
The invagination of the optic vesicles forms which structure?
Optic cup
What neurovascular structure is at the back of the optic cup?
What structure does the mouth of the optic cup turn into?
Optic nerve
Pupil
Structure that allows the Hyaloid Artery to enter the eye
Choroid Fissure
At what week do the lips of the choroid fissure fuse
7th
Defect wherein the choroid fissure failed to close?
Coloboma
Layers of the Retina
Inner Neural Layer
Outer Pigmented Layer
Inner Layer has an anterior and posterior portion. What are they?
Para Optica Retinae (Posterior 4/5)
Pars Ceca Retinae (Anterior 1/5)
Pars Ceca Retinae is again divided into 2 layers
Pars Iridica Retinae
Pars Ciliaris Retinae
Pars Iridica Retinae form
Inner layer of iris
Pars Ciliaris Retinae
Forms ciliary body
Layers of Pars Optica Retinae
Layer of rods and cones
Outer and Inner Nuclear Layer
Ganglion Cell Layer
Fibrous layer -contains cells that form the Optic Nerve
Layer of pars ceca retinae that is connected to lens by network of elastic fibers, the suspensory ligament
Pars Ciliaris Retinae
The sclera and choroid come from
Loose mesenchyme surrounding eye premordium
Highly vascularized pigmented inner layer
Choroid
Fibrous coat continuos with dura around optic nerve
Sclera
Formed from “vacuolization” of mesenchyme in front of eye
Inner layer in front of lens and iris —> Iridopupillary membrane
Outer layer continuous with sclera —> substancia propria of the cornea
Disappears completely providing communication between ant and posterior eye chambers
Iridopupillary membrane
Cornea is formed by
A. Ectoderm derived epithelial layer
B. Substancia propria (Stroma)
C. Epithelial layer that borders the anterior chamber
Structure that becomes the optic nerve at 7th week
Optic stalk at 7th week
Defect because of failure of resorption during formation of ant. chamber
Iridopupillary membrane persistence
Absence of one eye
Anopthalmia
Lens becomes opaque during intrauterine life
Congenital Cataract
Cause of cong. cataract
German Measle attach 4-7 weeks
Causes of Micropthalmia (eye is too small; eye ball 2/3 of normal volume
Cytomegalovirus
Taxoplasmosis
Eyes are fused because of loss of midline structures
Synopthalmia
Choroid
Mater
Pia/Arachnoid
Sclera
Dura mater
