Summary
A quantitative electron microscopic study of synaptic terminal degeneration was performed in the supraoptic nucleus (NSO) after a variety of major transections or ablations, destroying or interrupting in different combinations the afferent pathways known from earlier and own light microscopic degeneration studies. Solutions of a set of equations, expressing the percentage degenerations in synaptic profiles after different combinations in which the several pathways are interrupted by the various interferences, enabled the authors to give the following percentage numbers for afferent synapses from different sources.
32.7% of supraoptic afferents originate from the brain stem probably representing the monoaminergic innervation of this nucleus. The medial basal hypothalamus (21.0%), amygdala (13.5%), septum (13.5%), hippocampus (8.5%) and olfactory tubercle and further rostral cortical region (17.0%) are the other main sites of origin of supraoptic nucleus afferents. There are no supraoptic afferents from the optic nerve, superior cervical ganglion or fimbria hippocampi.
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Abbreviations
- A:
-
nucleus accumbens
- AB:
-
nucleus amygdaloideus basalis
- AC:
-
nucleus amygdaloideus centralis
- AL:
-
nucleus amygdaloideus lateralis
- AM:
-
nucleus amygdaloideus medialis
- ATV:
-
area tegmenti ventralis (Tsai)
- C:
-
caudate-putamen
- CA:
-
commissura anterior
- CC:
-
corpus callosum
- CFV:
-
commissura fornicvis ventralis
- CO:
-
chiasma opticum
- CP:
-
commissura posterior
- D:
-
nucleus tractus diagnolis
- DM:
-
nucleus dorsomedialis
- DS:
-
decussationes supraoptica
- F:
-
columna fornicis
- FH:
-
fimbria hippocampi
- FLM:
-
fasciculus longitudinalis medialis
- FP:
-
fornix praecommissuralis
- FS:
-
fornix superior
- G:
-
globus pallidus
- GD:
-
gyrus dentatus
- HI:
-
hippocampus
- IC:
-
capsula interna
- IP:
-
nucleus interpeduncularis
- LM:
-
lemniscus medialis
- M:
-
medial forebrain bundle (MFB)
- MM:
-
nucleus medialis thalami, pars medialis
- NA:
-
nucleus arcuatus
- R:
-
nucleus rhomboideus
- RE:
-
nucleus reuniens
- RV:
-
nucleus ruber
- S:
-
stria medullaris thalami
- SD:
-
nucleus dorsalis septi
- SF:
-
nucleus fimbrialis septi
- SG:
-
substantia grisea centralis
- SL:
-
nucleus lateralis septi
- SM:
-
nucleus medialis septi
- SN:
-
substantia nigra
- ST:
-
nucleus interstitialis striae terminalis
- T:
-
tractus olfactorius lateralis
- TD:
-
tractus diagonalis (Broca)
- TO:
-
tractus opticus
- TSTH:
-
tractus striohypothalamicus
- TU:
-
tuberculum olfactorium
- VM:
-
nucleus ventromedialis
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Záborszky, L., Léránth, C., Makara, G.B. et al. Quantitative studies on the supraoptic nucleus in the rat. II. Afferent fiber connections. Exp Brain Res 22, 525–540 (1975). https://doi.org/10.1007/BF00237352
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DOI: https://doi.org/10.1007/BF00237352