Abstract
In albino rats with one eye removed at birth (NE rats), electron microscopic studies were made on the optic tract (OT) to count the fibers and to measure their thickness. In addition, experiments were made in NE rats to know the physiological properties of the optic pathway such as conduction velocity, synaptic delay and so on. The number of fibers in the OT of NE rats was compared with that constituting the crossed and uncrossed pathways of normal adult rats. In NE rats the fiber count increased by about 30,000 in the OT ipsilateral to the remaining eye while it decreased by about the same amount in the contralateral OT. The axonal cross section area of OT fibers was measured as an index for fiber thickness. No marked abnormalities were found in the OTs of NE rats with regard to the morphological dimension. Relay cells (P-cells) of the LGN were recorded by electrical stimulation of the optic pathway. The uncrossed projection of NE rats to the LGN was characterized by the following points: (1) P-cells responding to stimulation of the uncrossed fibers were encountered in NE rats much more frequently than in normal adult rats. (2) Synaptic delays assumed to be involved in trans-synaptic activation of P-cells by the uncrossed fibers were calculated at larger values than for P-cells activated by the crossed fibers in NE rats and normally grown rats.
| Original language | English |
|---|---|
| Pages (from-to) | 172-178 |
| Number of pages | 7 |
| Journal | Experimental Brain Research |
| Volume | 51 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Jul 1983 |
| Externally published | Yes |
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Keywords
- Axonal cross section area
- Optic tract fiber counts
- Plasticity
- Synaptic delay
- Uncrossed optic fibers
ASJC Scopus subject areas
- Neuroscience(all)
Cite this
Bilateral reorganization of the rat optic tract following enucleation of one eye at birth. / Shirokawa, T.; Fukuda, Y.; Sugimoto, T.
In: Experimental Brain Research, Vol. 51, No. 2, 07.1983, p. 172-178.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Bilateral reorganization of the rat optic tract following enucleation of one eye at birth
AU - Shirokawa, T.
AU - Fukuda, Y.
AU - Sugimoto, T.
PY - 1983/7
Y1 - 1983/7
N2 - In albino rats with one eye removed at birth (NE rats), electron microscopic studies were made on the optic tract (OT) to count the fibers and to measure their thickness. In addition, experiments were made in NE rats to know the physiological properties of the optic pathway such as conduction velocity, synaptic delay and so on. The number of fibers in the OT of NE rats was compared with that constituting the crossed and uncrossed pathways of normal adult rats. In NE rats the fiber count increased by about 30,000 in the OT ipsilateral to the remaining eye while it decreased by about the same amount in the contralateral OT. The axonal cross section area of OT fibers was measured as an index for fiber thickness. No marked abnormalities were found in the OTs of NE rats with regard to the morphological dimension. Relay cells (P-cells) of the LGN were recorded by electrical stimulation of the optic pathway. The uncrossed projection of NE rats to the LGN was characterized by the following points: (1) P-cells responding to stimulation of the uncrossed fibers were encountered in NE rats much more frequently than in normal adult rats. (2) Synaptic delays assumed to be involved in trans-synaptic activation of P-cells by the uncrossed fibers were calculated at larger values than for P-cells activated by the crossed fibers in NE rats and normally grown rats.
AB - In albino rats with one eye removed at birth (NE rats), electron microscopic studies were made on the optic tract (OT) to count the fibers and to measure their thickness. In addition, experiments were made in NE rats to know the physiological properties of the optic pathway such as conduction velocity, synaptic delay and so on. The number of fibers in the OT of NE rats was compared with that constituting the crossed and uncrossed pathways of normal adult rats. In NE rats the fiber count increased by about 30,000 in the OT ipsilateral to the remaining eye while it decreased by about the same amount in the contralateral OT. The axonal cross section area of OT fibers was measured as an index for fiber thickness. No marked abnormalities were found in the OTs of NE rats with regard to the morphological dimension. Relay cells (P-cells) of the LGN were recorded by electrical stimulation of the optic pathway. The uncrossed projection of NE rats to the LGN was characterized by the following points: (1) P-cells responding to stimulation of the uncrossed fibers were encountered in NE rats much more frequently than in normal adult rats. (2) Synaptic delays assumed to be involved in trans-synaptic activation of P-cells by the uncrossed fibers were calculated at larger values than for P-cells activated by the crossed fibers in NE rats and normally grown rats.
KW - Axonal cross section area
KW - Optic tract fiber counts
KW - Plasticity
KW - Synaptic delay
KW - Uncrossed optic fibers
UR - http://www.scopus.com/inward/record.url?scp=0020580861&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0020580861&partnerID=8YFLogxK
U2 - 10.1007/BF00237192
DO - 10.1007/BF00237192
M3 - Article
VL - 51
SP - 172
EP - 178
JO - Experimental Brain Research
JF - Experimental Brain Research
SN - 0014-4819
IS - 2
ER -