Essentials of Veterinary Ophthalmology - Kirk N. Gelatt

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— Branches of the central retinal artery form 4 51 Pupillary sphincter differentiates Retinal vessels present — 56 Ciliary muscle appears — Tapetum present (dog) 5 40 Layers of the choroid are complete with pigmentation 6 — Eyelids begin to open, light perception 1P Pupillary dilator muscle present 7 1–14P Pupillary membrane atrophies 1–16P Rod and cone inner and outer segments present in posterior retina 10–13P Pars plana distinct 9 16–40P Retinal layers developed 14P Regression of pupillary membrane, TVL, and hyaloid artery nearly complete Lacrimal duct canalized
Ocular part or event Gestational size (mm)
Lens
Optic vesicle 6
Lens placode 6
Optic cup and lens placode 10
Separation of lens vesicle from surface ectoderm 10
Primary lens fibers 15
Lens vesicle cavity disappears 24
Completion of lens capsule 50
Secondary lens fibers 58
Perilenticular vascular mesoderm
Extension of primary vitreous (hyaloid artery) to lens 15
TVL 33
Disappearance of posterior lenticular vascular network 410
Disappearance of TVL 410
Iris
Major arterial circle of iris 90
Iris reaches front of lens 200
Pigment in stroma 200
Sphincter muscle 410
Dilator muscle 410
Ciliary body
Ciliary processes 125
Ciliary processes touch lens equator 230
Pars plana (distinct) 200
Pars plana fully developed 410
Choroid
Choroidal net in posterior pole 33
Choroidal net throughout 50
Outermost large choroidal vessels 40
Choriocapillaris 90
Pigmentation of choroid 90
Retina – posterior third
Inner and outer nucleated zones 10
Multilayer outer cup of optic vesicle forms single cells 20
Nerve fiber layer 20
Optic nerve well formed 24
Inner/outer neuroblastic layers 14
Transient layer of Chievitz 14
Inner plexiform layer 180

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