from The Century Dictionary and Cyclopedia
- n. The nervous system of some acalephs, as the Medusæ, forming a fibrous ring round the edge of the disk, with cellular ganglionic enlargements at regular intervals; a nerve-collar.
Sorry, no etymologies found.
The nerve-ring is well supplied with epithelial and ganglionic nerve-cells; their function is wholly reflex and involuntary; they preside over the pulsing or swimming movements of the nectocalyx.
Romanes determined that the centres governing pulsation were located in the nerve-ring of the swimming-bell, and that each section of the nectocalyx had its individual nerve-centre. [
Its transparent, translucent nectocalyx, or swimming-bell, has a central nervous system which is localized on the margin of the bell, and which forms the so-called "nerve-ring" of Romanes. [