ISSN:
0003-276X
Keywords:
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Medicine
Notes:
On grounds of electron microscopic appearance (Hama, '60), the side of abdominal photoreceptor organ in crayfish (Orconectes virilis [Hagen]) has been questioned. Illumination of any part of ventral nerve cord (exclusive of A6 ganglion), e.g., A2, A3, A4, A5, and afferent roots of A6, shows no physiological response. A6 alone shows phototransduction process pulses. Sectioning of cord restricts locus to A6. Spurious effects from cephalic eye response were seen.Physiological investigation has restricted the crayfish-tail photoreceptor-organ to include photosensitive elements lying only within the sixth abdominal ganglion, and two to four B-fibers carrying nerve impulse responses through the ventral nerve cord. It is therefore possible to exclude the “Hama-structures,” associated with the giant fiber system, and located diffusely in the nerve cord, from any role in the phototransduction process. Attention of anatomists is called to this primitive and interesting photoreceptor organ.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/ar.1091470205
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