Coordination between catch connective tissue and muscles through nerves in the spine joint of the sea urchin Diadema setosum

The Journal of Experimental Biology
T Motokawa, Yoshiro Fuchigami

Abstract

Echinoderms have catch connective tissues that change their stiffness as a result of nervous control. The coordination between catch connective tissue and muscles was studied in the spine joint of the sea urchin Diadema setosum. Spine joints are equipped with two kinds of effector: spine muscles and a kind of catch connective tissue, which is called the catch apparatus (CA). The former is responsible for spine movements and the latter for maintenance of spine posture. Diadema show a shadow reaction in which they wave spines when a shadow falls on them, which is a reflex involving the radial nerves. Dynamic mechanical tests were performed on the CA in a joint at which the muscles were severed so as not to interfere with the mechanical measurements. The joint was on a piece of the test that contained other spines and a radial nerve. Darkening of the preparation invoked softening of the CA and spine waving (the shadow reaction). Electrical stimulation of the radial nerve invoked a similar response. These responses were abolished after the nerve pathways from the radial nerve to spines had been cut. A touch applied to the CA stiffened it and the adjacent spines inclined toward the touched CA. A touch to the base of the adjacent spi...Continue Reading

References

Jan 1, 1987·Comparative Biochemistry and Physiology. C, Comparative Pharmacology and Toxicology·T Motokawa
Jan 14, 2003·Matrix Biology : Journal of the International Society for Matrix Biology·Jennifer P TipperJohn A Trotter
Oct 5, 2010·The Journal of Experimental Biology·Akira YamadaTatsuo Motokawa
May 17, 2012·The Biological Bulletin·Tatsuo MotokawaKenichi Umeyama

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Citations

Apr 26, 2017·International Journal of Molecular Sciences·Kheng Lim Goh, David F Holmes
Apr 13, 2018·PloS One·Igor Yu DolmatovAlexey V Boyko
Aug 26, 2020·The Journal of Comparative Neurology·Laurent FormeryJenifer C Croce
Jul 18, 2017·Journal of Anatomy·Liisa M BlowesMaurice R Elphick
Apr 19, 2018·Journal of the American Society for Mass Spectrometry·Eric B MonroeJonathan V Sweedler

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