4. Its branches come into close contact (SY^{1}) with those of an
associative or communicating nerve-cell (A.C.).
5. Other branches of the associative cell come into close contact
(SY^{2}) with the branches or dendrites of a motor nerve-cell (M.C.).
6. An impulse or command travels along the motor nerve-fibre or axis
cylinder of the motor nerve-cell.
7. The motor nerve-fibre ends on a muscle-fibre (M.F.) near the surface.
This moves and the reflex action is complete.]
[Illustration: _Photo: British Museum_ (_Natural History_).