Optic stalk
Optic Stalk
The Optic Stalk (pronunciation: /ˈɒptɪk stɔːk/) is a narrow structure that connects the optic vesicle to the diencephalon during the embryonic development of the vertebrate eye.
Etymology
The term "Optic Stalk" is derived from the Greek word "optikos" meaning "of sight" and the Old English word "stalc" meaning "stem of a plant".
Development
The optic stalk develops from the neural ectoderm and forms a connection between the developing optic vesicle and the diencephalon. As the optic vesicle grows and invaginates to form the optic cup, the optic stalk becomes the pathway for the ganglion cell axons to reach the brain, forming the optic nerve.
Related Terms
- Optic Vesicle: An outpouching of the diencephalon that gives rise to the optic stalk and the retina.
- Diencephalon: The posterior part of the forebrain, connecting the midbrain and the cerebral hemispheres.
- Neural Ectoderm: The outermost layer of the embryonic ectoderm from which the nervous system develops.
- Optic Cup: A two-layered structure formed by the invagination of the optic vesicle during the development of the eye.
- Ganglion Cell: A type of neuron located in the retina that receives visual information from photoreceptor cells.
- Optic Nerve: The nerve that transmits visual information from the retina to the brain.
External links
- Medical encyclopedia article on Optic stalk
- Wikipedia's article - Optic stalk
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