title: Light and dark adaptational changes in the accessory eye of the shrimp, Palaemonetes.
abstract: The fine structure of the accessory eye of the shrimp, Palaemonetes, was studied after light and dark adaptation. Adjacent to the principal compound eye, the accessory eye is a small compound eye composed of about 20 ommatidia which are smaller in structure to the ommatidia of the principal compound eye. During dark adaptation, rhabdomal microvilli increase in length; however, little pigment migration occurs. The implications of these changes in relation to the function of the accessory eye are discussed.
mesh_terms: D000818:Animals; D003315:Cornea / Q000648:ultrastructure; D003623:Dark Adaptation; D033364:Decapoda / Q000502:physiology* / Q000648:ultrastructure; D004721:Endoplasmic Reticulum / Q000648:ultrastructure; D005123:Eye / Q000648:ultrastructure; D008027:Light; D009799:Ocular Physiological Phenomena; D009940:Organoids / Q000648:ultrastructure; D010786:Photoreceptor Cells / Q000648:ultrastructure; D010860:Pigments, Biological
chemical_list: D010860:Pigments, Biological