288
c
J. DIAMOND
Fig. 14a.
antidromic than in the orthodromic direction (Furshpan and Potter,
1959; see also Katz, 1950).
Is the A1 unit actually an interneuron that connects the Mauthner
axon to the motoneuron (see Fig. 18): If so, what could be the purpose
of having a cell so inserted into an excitatory pathway apparently highly
organized for speedy and direct reflex action? To answer these questions
we must first consider further the crossed inhibition, which will allow
us to understand the basis of the minimum discrimination time, and
then the spinal cord histology and the location of the A l and A2 units.
4. INHIBITION
a. Mechanism. The crossed inhibition appears to be chemically
transmitted since (1) it is frequently associated with a hyperpolarization
c
J. DIAMOND
Fig. 14a.
antidromic than in the orthodromic direction (Furshpan and Potter,
1959; see also Katz, 1950).
Is the A1 unit actually an interneuron that connects the Mauthner
axon to the motoneuron (see Fig. 18): If so, what could be the purpose
of having a cell so inserted into an excitatory pathway apparently highly
organized for speedy and direct reflex action? To answer these questions
we must first consider further the crossed inhibition, which will allow
us to understand the basis of the minimum discrimination time, and
then the spinal cord histology and the location of the A l and A2 units.
4. INHIBITION
a. Mechanism. The crossed inhibition appears to be chemically
transmitted since (1) it is frequently associated with a hyperpolarization