Eyespots
(Date:3/28/2011)... have completed the first human randomized controlled trial ... uses a catheter-based probe inserted into the renal ... nerves near the kidneys (or in the renal ... The researchers say these results confirm that RDN ...
The earliest eyes, called "eyespots", were simple patches of photoreceptor cells, physically similar to the receptor patches for taste and smell.
Flatworms have two light-sensitive eyespots that have pigmentation making them look cross-eyed. The presence of three muscle layers facilitates varied movement. Gland cells secrete a mucous material upon which the animal slides or glides.
 See also: Species, Human, Action, Animal, Origin
  
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