cerebellum come into this region, all Of WhïCh form a
and optio tectum.
Accordingly, the pineal organ is believed
signicant visceral correlation, especially an important center
to perform secretory function and photoreoeption l'Holmgren,
of feeding mechanism.
ln sh in which the center of
1965).
feeding mechanism is well-developed, regions corresponding
The hypophysis of teleosts diers considerably … the
”EO the tuber cinereum and mammillary body of mammals
degree of its development according to the kind of sh
can
be observed but functional differentiation of those
(=E=(;OWW
zi]gcw[ch
*071t707'/23‘m'/1…“ “N‘/ea.
nuclei is scarcely known as yet.
*Para/ichNzys o/7t:accus…
Generally, it is situated behind the
The sacous vasculosus, an organ inviting attention especially
Optic ohiasma and consisïed of three parts: anterior,
in sh, is present on the projected portion of the ventral
intermedial and posterior.
Similar to that of higher animals,
aspect Of the hypothalamus.
This has already been
it is connected with pars nervosa by tractus hypophysius.
mentioned by Collins early in 1685.
The function of this
Thus, nervous control of endocrine functions is performed.
organ is not clearly understood and even today there are
Studies on the mechanism of hormonal and nervous control
numerous
opinions on the subject.
ln many sh, this organ
concerning the chromatophore changes in sh were carried
is present at a more posterior part than hypophysis and is
out extensively by von Frisch (1910) and Parker :1932i, and
situated between the two sides of the lobus inferior.
The
are
proving to be Of interest to many biologists.
Through
size and shape Of Îh9 SâCCUS varies very much.
Some Sh
these experiments, the relation between the optio center and
have large 38CCUS
whereas the
the neurohumor has become clear.
lt has already been
SêCCUS
Of some Sh is very minute (”3950771567' .ÏÛPOm'CUS}.
stated that some of the bers of tractus hypophysius
Originally, it was formed by extension Of the layer Of
perform neurosecretory function (Soharrer, 1928).
ependymal cells of the third ventricle.
The inside of the
saccus
lS lled Wïîîh b100d V€SSGIS… mOSÎ 08865, the
The mesencephalon of sh is characterized by the marked
oiliary cells are present within ependymal cells as stated
development of the tectum which corresponds to superior
above.
This saocus is innervated by the tractus saoci
collioulus of mammals.
ln sh, almost all of the bers of
vasculosi coming out from the hypothalamus.
Dammerman
the tractus opticus terminate at the tectum.
The tectum of
(1910) has established a theory that it is a sensory organ
blind sh and particularly of deep-sea sh is very small.
to perceive water pressure but this is not conrmed.
The teotum has a complicated structure composed of many
Becoari (1943) says that this organ not only serves as a
layers which consist of various kinds of cells.
Although the
sensory organ but is also related to the adjustment of
number varies in animals, it has been discovered to be
cerebrospinal uid.
However, this theory is not established.
from ve (Stieda, 1868) to 10 (Ramon y Cajal, 1895) layers.
ln deep-sea sh, this organ is well-developed in some but
in the tectum, not only optio bers but also aerent bers
poorly developed in others (Tuge and Shimamura, 1958).
related to olfaction, gustation and skin sense appear.
Also
Therefore, the correlation to ecology seems to be inconclusive.
impulses are conveyed from the teotum to motor nuclei of
The pineal body of the sh is a tube-like evagination at the
the mesencephalon, medulla oblongata and spinal cord,
roof of the diencephalon, its root being connected with the
respectively, and to the cerebellum and reticular formation,
brain cavity.
lt enters deeply into the cavity in some kinds
mostly via tractus tecto-bulbaris, tractus tecto-spinalis and
of sh.
The pineal body of many shes consists of the
tractus teoto (mesencephalo)-cerebellaris. respectively.
epiphysis proper.
in some sh, the parapineal organ is
ln sh, where both sides of the optio tectum meet at the
located in the rostral part of the epiphysis.
ln rare
center, torus longitudinalis is present which is extended
instances, sh, i.e. T/zzrmzus, have an apparatus of light
longitudinally within the optio ventricle and united with the
penetration on the skull above the pineal region.
lt is
oerebellum and tectum by bers.
This is a structure
said that in the epiphysis there are sensory and ganglion
characteristic of teleosts (*.Uzzgz‘l ccp/za/us, *Ti'if/ii‘iii'i/S /cpfur…)
cells.
These axons appear to form the nerve pinealis, and
and certain ganoids which may be related to static function,
terminate at the habenular nucleus, posterior oommissure
but this is problematical (Kudo, 1923).
ln the
and optio tectum.
Accordingly, the pineal organ is believed
signicant visceral correlation, especially an important center
to perform secretory function and photoreoeption l'Holmgren,
of feeding mechanism.
ln sh in which the center of
1965).
feeding mechanism is well-developed, regions corresponding
The hypophysis of teleosts diers considerably … the
”EO the tuber cinereum and mammillary body of mammals
degree of its development according to the kind of sh
can
be observed but functional differentiation of those
(=E=(;OWW
zi]gcw[ch
*071t707'/23‘m'/1…“ “N‘/ea.
nuclei is scarcely known as yet.
*Para/ichNzys o/7t:accus…
Generally, it is situated behind the
The sacous vasculosus, an organ inviting attention especially
Optic ohiasma and consisïed of three parts: anterior,
in sh, is present on the projected portion of the ventral
intermedial and posterior.
Similar to that of higher animals,
aspect Of the hypothalamus.
This has already been
it is connected with pars nervosa by tractus hypophysius.
mentioned by Collins early in 1685.
The function of this
Thus, nervous control of endocrine functions is performed.
organ is not clearly understood and even today there are
Studies on the mechanism of hormonal and nervous control
numerous
opinions on the subject.
ln many sh, this organ
concerning the chromatophore changes in sh were carried
is present at a more posterior part than hypophysis and is
out extensively by von Frisch (1910) and Parker :1932i, and
situated between the two sides of the lobus inferior.
The
are
proving to be Of interest to many biologists.
Through
size and shape Of Îh9 SâCCUS varies very much.
Some Sh
these experiments, the relation between the optio center and
have large 38CCUS
whereas the
the neurohumor has become clear.
lt has already been
SêCCUS
Of some Sh is very minute (”3950771567' .ÏÛPOm'CUS}.
stated that some of the bers of tractus hypophysius
Originally, it was formed by extension Of the layer Of
perform neurosecretory function (Soharrer, 1928).
ependymal cells of the third ventricle.
The inside of the
saccus
lS lled Wïîîh b100d V€SSGIS… mOSÎ 08865, the
The mesencephalon of sh is characterized by the marked
oiliary cells are present within ependymal cells as stated
development of the tectum which corresponds to superior
above.
This saocus is innervated by the tractus saoci
collioulus of mammals.
ln sh, almost all of the bers of
vasculosi coming out from the hypothalamus.
Dammerman
the tractus opticus terminate at the tectum.
The tectum of
(1910) has established a theory that it is a sensory organ
blind sh and particularly of deep-sea sh is very small.
to perceive water pressure but this is not conrmed.
The teotum has a complicated structure composed of many
Becoari (1943) says that this organ not only serves as a
layers which consist of various kinds of cells.
Although the
sensory organ but is also related to the adjustment of
number varies in animals, it has been discovered to be
cerebrospinal uid.
However, this theory is not established.
from ve (Stieda, 1868) to 10 (Ramon y Cajal, 1895) layers.
ln deep-sea sh, this organ is well-developed in some but
in the tectum, not only optio bers but also aerent bers
poorly developed in others (Tuge and Shimamura, 1958).
related to olfaction, gustation and skin sense appear.
Also
Therefore, the correlation to ecology seems to be inconclusive.
impulses are conveyed from the teotum to motor nuclei of
The pineal body of the sh is a tube-like evagination at the
the mesencephalon, medulla oblongata and spinal cord,
roof of the diencephalon, its root being connected with the
respectively, and to the cerebellum and reticular formation,
brain cavity.
lt enters deeply into the cavity in some kinds
mostly via tractus tecto-bulbaris, tractus tecto-spinalis and
of sh.
The pineal body of many shes consists of the
tractus teoto (mesencephalo)-cerebellaris. respectively.
epiphysis proper.
in some sh, the parapineal organ is
ln sh, where both sides of the optio tectum meet at the
located in the rostral part of the epiphysis.
ln rare
center, torus longitudinalis is present which is extended
instances, sh, i.e. T/zzrmzus, have an apparatus of light
longitudinally within the optio ventricle and united with the
penetration on the skull above the pineal region.
lt is
oerebellum and tectum by bers.
This is a structure
said that in the epiphysis there are sensory and ganglion
characteristic of teleosts (*.Uzzgz‘l ccp/za/us, *Ti'if/ii‘iii'i/S /cpfur…)
cells.
These axons appear to form the nerve pinealis, and
and certain ganoids which may be related to static function,
terminate at the habenular nucleus, posterior oommissure
but this is problematical (Kudo, 1923).
ln the