Information about Olfactory Placode
A placode is an area of thickening in the embryonic epithelial layer where some organ or structure later develops. The term usually refers to cranial placodes, peripheral nervous system structures associated with the special senses and cranial ganglia. Placodes also develop in the formation of other structures, such as teeth and feathers.
Cranial Placodes
The placodes associated with the special senses are:- The otic placode forms the otic pit and the otic vesicle, giving rise eventually to organs of hearing and equilibrium.
- The lens placode under the direction of the optic vesicle gives rise to the lens of the eye.
- The nasal placode (or olfactory placode[1]) gives rise to the olfactory epithelium of the nose.
References
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epithelium is a tissue composed of a layer of cells. Epithelium lines both the outside (skin) and the inside cavities and lumen of bodies. The outermost layer of our skin is composed of dead stratified squamous, keratinized epithelial cells.
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The Peripheral nervous system resides or extends outside the "CNS" central nervous system (the brain and spinal cord) to serve the limbs and organs. Unlike the central nervous system, however, the PNS is not protected by bone, leaving it exposed to toxins and mechanical injuries.
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special senses are the first four of these; touch is specifically excluded as a special sense. Instead, the various aspects of touch (pain, heat, pressure) are all categorized as somatic senses.
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otic pit[1]).
This article was originally based on an entry from a public domain edition of Gray's Anatomy.
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References
1. ^ Embryology at UNC hednk-010
This article was originally based on an entry from a public domain edition of Gray's Anatomy.
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The mouth of the auditory pit is then closed, and thus a shut sac, the auditory vesicle (or otic vesicle[1]), is formed; from it the epithelial lining of the membranous labyrinth is derived.
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The Lens placode is a thickened portion of ectoderm which serves as the precursor to the lens.
Sox2 and Pou2f1 are involved in its development.[1]
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Sox2 and Pou2f1 are involved in its development.[1]
See also
- placode
References
1.
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optic vesicles.
They project toward the sides of the head, and the peripheral part of each expands to form a hollow bulb, while the proximal part remains narrow and constitutes the optic stalk.
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They project toward the sides of the head, and the peripheral part of each expands to form a hollow bulb, while the proximal part remains narrow and constitutes the optic stalk.
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The lens is a transparent, biconvex (lentil-shaped) structure in the eye that, along with the cornea, helps to refract light to be focused on the retina. Its function is thus similar to a human-made optical lens.
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The olfactory epithelium is a specialized epithelial tissue inside the nasal cavity that is involved in smell. In humans, it measures about 1 inch wide by 2 inches long (about 2 cm by 5 cm) and lies on the roof of the nasal cavity about 3 inches (about 7 cm) above and behind the
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nose is a protuberance in vertebrates that houses the nostrils, or nares, which admit and expel air for respiration in conjunction with the mouth.
In most humans, it also houses the nosehairs, which catch airborne particles and prevent them from reaching the lungs.
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In most humans, it also houses the nosehairs, which catch airborne particles and prevent them from reaching the lungs.
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University of North Carolina at Chapel Hill is a public, coeducational, research university located in Chapel Hill, North Carolina, United States. Also known as The University of North Carolina, Carolina, North Carolina, or simply UNC
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