Table 1 1
The Comparative Morphology of the Neurohypophysis in Fish
Connections between
Preoptic nucleus:
Connections between pars
neurosecretory
Division into
Median Destinanervoea/pars intermedia'
fibers and CSFa
magno-/pa~o- eminence/ tion of
Systemic
cellular
portal
portal
Direct
Preoptic
Pars
venous
Class
regions"
system'
systemaJ
Pars newosa
neural
Vascular
nucleus
newosa
outflow0
Cyclostomes
(a) Myxiniformes
+
Weak division
(b) Petromyeoniformes
-
Uniform cells
Elasmobranchs
-
Uniform cells
Holocephalians
-
Irregular cells
+
NIL
Small,&crete,
-
-
dorsal wall of
Doubtful
Doubtful
infundibulum
+
Adeno. Small, not clearly
-
Possible
(?)
(?)
demarcated,
ventral wall of
infundibulum
+
NIL;
Variable: well
+
Possible
Adeno.
defined, t o
t o intermedia
intimately fused
with intermedia
+
Adeno. Defined;
+
Possible
intimately fused to intermedia
with intermedia
+
+
-
Probably
important
+
+
+
+
-
+