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Demonstration of distinct corticotropin releasing factor — containing neuron populations in the bed nucleus of the stria terminalis. A light and electron microscopic immunocytochemical study in the rat

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Summary

Immunocytochemical light and electron microscopic studies revealed two distinct populations of corticotropin releasing factor (CRF) — containing neurons, a dorsolateral and ventrolateral group, located in the bed nucleus of the stria terminalis (BST) of the rat brain. CRF neurons of the dorsolateral group had a smaller diameter and more primary dendrites than those of the ventrolateral group. CRF neurons in the dorsolateral BST had both somatic and dendritic spines, smooth contoured nuclei, and many dense and alveolate vesicles in their cytoplasm. Whereas, CRF neurons in the ventrolateral BST had only dendritic spines, irregularly-shaped indented nuclei and contained only alveolate vesicles in their cytoplasm.

The only obvious difference in the type of unidentified afferents that synapsed on the CRF neurons of the BST could be attributed to the presence of the somatic spines on the CRF neurons of the dorsolateral population. Otherwise, the CRF neurons of the BST had a profuse innervation that included axosomatic, axospinous and axodendritic synapses.

CRF-containing axons were distributed unevenly throughout the BST. The density of CRF axons was greatest in the lateral subdivisions of the BST, but the ventromedial BST contained many more CRF axons than the dorsomedial BST.

The presence of these two CRF neuron populations in the BST suggests functional subdivision beyond previous proposals of a medial and lateral separation of function. Now there is additional morphological evidence to support the proposal of a dorsal and ventral separation of function within the BST.

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  1. Department of Pharmacology and Toxicology, Cardiovascular Research Laboratories, College of Pharmacy, University of Georgia, 30602, Athens, GA, USA

    C. F. Phelix

  2. Department of Anatomy, University of Missouri-Columbia Medical Sciences Building, 65212, Columbia, MO, USA

    W. K. Paull

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Phelix, C.F., Paull, W.K. Demonstration of distinct corticotropin releasing factor — containing neuron populations in the bed nucleus of the stria terminalis. A light and electron microscopic immunocytochemical study in the rat. Histochemistry 94, 345–364 (1990). https://doi.org/10.1007/BF00266441

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