Special Senses Development of Eye



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Special Senses
Development of Eye

Optic Vesicle

Hollow Diverticulae distal ends  optic vesicles

Proximal ends  optic stalk

Optic Vesicles induce formation of lens placode  lens vesicle

Optic Cup

Formed by indentation of optic vesicle by lens vesicle

Choroid Fissure  Conducts Mesenchyme, Hyaloid artery

Proximal Hyaloid Artery  Central Artery of Retina

Derivatives of Optic Cup

Outer layer  Pigment layer of Retina

Inner layer  Neural layer of Retina

 Secondary Vitreous Humor

Ant. Rim  Iris

Tissue Ring  Ciliary Body (From Mesenchyme)

Lens


Ectoderm in Origin

Develops from Lens Vesicle

Vascular coat for developing lens from Mesenchyme

Anterior part called pupillary membrane

Choroid and Sclera

Choroid Continuous with PIA

Sclera Continuous with DURA

Cornea


Epithelium  From Surface Ectoderm

Substanta Propria  From Mesoderm

Endothelium  From Neural Crest Cells

Lacrimal Gland

From Ectoderm

Optic Nerve

Myelination AFTER Birth
Development of Ear

Six Auricular Hillocks Mesenchymal thickenings

1st & 2nd Arches


Tympanic Membrane Ectoderm + Mesoderm + Ectoderm

Middle Ear

1st pouch  tubotympanic recess distal part middle ear cavity

proximal part Pharyngotympanic tube

Inner Ear

First to develop

Thickening of ectoderm  Otic Placode  Otic Pit  Otic Vesicle  Membranous Labyrinth

Membranous Labyrinth

Utricle, Saccule, Cochlear Duct, Semicircular DUCT, endolymphatic duct & sac

Bony Labyrinth



Cochlea, Vestibule, Semicircular CANALS


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