Will
mesencephalon there is a tegmentum WhÎCh forms the
passing through between the valvula cerebelli and
the
bottom of the tectum
The part present on the back of
corpus cerebelli
but their motor nuclei are situated at the
the tegmentum and which is projected
toward the tectal
dorsal part Of faSCÎCU|US longitudinalis medialis.
ventricle is called torus semicircularis and is homologous t°
'
-
inferior co…cu…s of mamma|g_ This is extremely
“General'y' the cerebellum
of teleosts is projected as a large
well—developed in sh with well—developed acoustiço-laterai
lobe toward
the dorsal side
of the medulla oblongata as
,
system.
are those of elasmobranchs and ganoids.
ln some sh
The torus semicircularis of some deep-sea
fish is markedly
(Mormyridae), the cerebellum is extended largely over the
well-developed (*Argymsomus argentatus, *PteroÿhTyne hist1'i0)- »
forebrain.
The cerebellum is generally divided into two
Also the form of this torus often depends upon that
the
parts, one”, corpus cerebelli projecting forward to the
valvula cerebelli.
ln sh with small valvula, the tori of both
side and
the other, valvula cerebelli which is extended
sides are situated close to each other.
below
the tectum.
It is bèlieved that the corpus cerebelli
ln many sh, this torus is connected with the valvula
-
.
developed fromthe region which occupies the dorsolateralÎ
cerebelli.
The fasciculus longitudinalis lateralis which
portion Of the medulla oblongata, namely,
the
î
consists of the majority of the lemniscus system coming
acoustico-lateral area. Valvula cerebelli entering into the
from the acoustic area, terminates in the torus. Both the
tectal ventricle shows various shapes according to the kind
optio tectumah‘d torus semicircularis are united with the
'
of sh (*Thunnus thynnus, *Katsuwonus pelamis, *Pterophryne
,
valvula and the corpus of cerebellum by tractus .
MS…—o, *Lophius Zitulon), but it may be said that sh with
_
and tractus
well-developed corpus cerebelli also have large valvula;
:
cerebello—mesencephalîCU3 (Tugè,
.
-
Corpus cerebelli is an unpaired lobe.
The cerebellum
The principal function of this torus is considered to be
consists of three layers, i.e., granular, Purkinje and
.
_
gravistatic.
ln the medial portion of the mesencephalic
_
molecular from the surface to the inside.
_
tegmentum there appears the fasciculus longitudin‘alis
Contrary ’EO higher animals, the Purkinje cell layer is
medialis at the caudal part of the posterior commissure.
situated between the granular and molecular layers f0rmmgî
As is the case with higher animals this” forms a center-of ,
an irregular cell arrangement. The cerebellar nuclei in the
somatic motor column and is extended through the medùlla
cerebellum of sh are not developed, and there is no
and cord.
Fiber bundles, that is,. tractus tecto_—bulbaris
contact
kinds of sensory organs, except the
Î
which come from both sides of the tectum as if encircling
possible connection with some of the lateral nerves. As
laterally the tegmentum are observed. Ventromedially
stated before, impulses of eyesight, gustation and
.
of the tegmentum is the nucleus interpeduncularis which
cutaneous sensation are conveyed to the cerebellum by
_
receives the tract from
nucleus habenulae.
This tract is
tractus tecto-cerebellaris, tractus bulbo-cerebellaris and
named tractus habenulo-interpeduncularisor fasciculus
'
tractus spin0-cerebellari5.
'" P3YÜCUI3E impulses from
%
retroexus as it
is in the case with higher
is
,
‘
audition and lateral line system are directly conveyed to the:
well—developed in certain sh species (*Mygtriophis
'
cerebellum through the acousticdlateral area. -lmpulses from
Poi'Phÿïtaus, *Muraenesÿx cinereus). in the tegmentum, reticulah
are sent to mom" centers Of Spinal cord,
'_
formation which is composed
of characteristically large
medulla Oblongata, retibùlar formations, mesencephalon
:
cells irregulariy scattered can
observed.
and diencéphaloh, principally through tractus
,
ï
ob‘served‘in higher animals is notdeveloped in sh and it
tractus cerébello-mesehcep‘halicuS and
î
is not dierentiated from
-
tractus cerébello-hyp0thalamicuS. The corpus cerebelli is
Ë -
,
Motor nuclei of the 3rd cranial nerves are pres—ent,buried
connected at the acoustico-lateral area withthe medulla
î—
Δ
in fasC:iculuslongitudinalis medialis as stated above, from
f
.obl‘ongata but the
the connecting area is '
side.
someWhat expanded laterally.añd
$ŒCâ”ed emmen’3
cranial nérv,es‘coming
Where granular cells are co'ngested.g Crista:
mesencephalon there is a tegmentum WhÎCh forms the
passing through between the valvula cerebelli and
the
bottom of the tectum
The part present on the back of
corpus cerebelli
but their motor nuclei are situated at the
the tegmentum and which is projected
toward the tectal
dorsal part Of faSCÎCU|US longitudinalis medialis.
ventricle is called torus semicircularis and is homologous t°
'
-
inferior co…cu…s of mamma|g_ This is extremely
“General'y' the cerebellum
of teleosts is projected as a large
well—developed in sh with well—developed acoustiço-laterai
lobe toward
the dorsal side
of the medulla oblongata as
,
system.
are those of elasmobranchs and ganoids.
ln some sh
The torus semicircularis of some deep-sea
fish is markedly
(Mormyridae), the cerebellum is extended largely over the
well-developed (*Argymsomus argentatus, *PteroÿhTyne hist1'i0)- »
forebrain.
The cerebellum is generally divided into two
Also the form of this torus often depends upon that
the
parts, one”, corpus cerebelli projecting forward to the
valvula cerebelli.
ln sh with small valvula, the tori of both
side and
the other, valvula cerebelli which is extended
sides are situated close to each other.
below
the tectum.
It is bèlieved that the corpus cerebelli
ln many sh, this torus is connected with the valvula
-
.
developed fromthe region which occupies the dorsolateralÎ
cerebelli.
The fasciculus longitudinalis lateralis which
portion Of the medulla oblongata, namely,
the
î
consists of the majority of the lemniscus system coming
acoustico-lateral area. Valvula cerebelli entering into the
from the acoustic area, terminates in the torus. Both the
tectal ventricle shows various shapes according to the kind
optio tectumah‘d torus semicircularis are united with the
'
of sh (*Thunnus thynnus, *Katsuwonus pelamis, *Pterophryne
,
valvula and the corpus of cerebellum by tractus .
MS…—o, *Lophius Zitulon), but it may be said that sh with
_
and tractus
well-developed corpus cerebelli also have large valvula;
:
cerebello—mesencephalîCU3 (Tugè,
.
-
Corpus cerebelli is an unpaired lobe.
The cerebellum
The principal function of this torus is considered to be
consists of three layers, i.e., granular, Purkinje and
.
_
gravistatic.
ln the medial portion of the mesencephalic
_
molecular from the surface to the inside.
_
tegmentum there appears the fasciculus longitudin‘alis
Contrary ’EO higher animals, the Purkinje cell layer is
medialis at the caudal part of the posterior commissure.
situated between the granular and molecular layers f0rmmgî
As is the case with higher animals this” forms a center-of ,
an irregular cell arrangement. The cerebellar nuclei in the
somatic motor column and is extended through the medùlla
cerebellum of sh are not developed, and there is no
and cord.
Fiber bundles, that is,. tractus tecto_—bulbaris
contact
kinds of sensory organs, except the
Î
which come from both sides of the tectum as if encircling
possible connection with some of the lateral nerves. As
laterally the tegmentum are observed. Ventromedially
stated before, impulses of eyesight, gustation and
.
of the tegmentum is the nucleus interpeduncularis which
cutaneous sensation are conveyed to the cerebellum by
_
receives the tract from
nucleus habenulae.
This tract is
tractus tecto-cerebellaris, tractus bulbo-cerebellaris and
named tractus habenulo-interpeduncularisor fasciculus
'
tractus spin0-cerebellari5.
'" P3YÜCUI3E impulses from
%
retroexus as it
is in the case with higher
is
,
‘
audition and lateral line system are directly conveyed to the:
well—developed in certain sh species (*Mygtriophis
'
cerebellum through the acousticdlateral area. -lmpulses from
Poi'Phÿïtaus, *Muraenesÿx cinereus). in the tegmentum, reticulah
are sent to mom" centers Of Spinal cord,
'_
formation which is composed
of characteristically large
medulla Oblongata, retibùlar formations, mesencephalon
:
cells irregulariy scattered can
observed.
and diencéphaloh, principally through tractus
,
ï
ob‘served‘in higher animals is notdeveloped in sh and it
tractus cerébello-mesehcep‘halicuS and
î
is not dierentiated from
-
tractus cerébello-hyp0thalamicuS. The corpus cerebelli is
Ë -
,
Motor nuclei of the 3rd cranial nerves are pres—ent,buried
connected at the acoustico-lateral area withthe medulla
î—
Δ
in fasC:iculuslongitudinalis medialis as stated above, from
f
.obl‘ongata but the
the connecting area is '
side.
someWhat expanded laterally.añd
$ŒCâ”ed emmen’3
cranial nérv,es‘coming
Where granular cells are co'ngested.g Crista: