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Related Experiment Video

Updated: Jun 25, 2026

Isolation of Targeted Hypothalamic Neurons for Studies of Hormonal, Metabolic, and Electrical Regulation

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Published on: August 4, 2023

Sagittalis nucleus: a novel hypothalamic nucleus.

H Mori¹, K-I Matsuda, D W Pfaff

¹Department of Anatomy and Neurobiology, Kyoto Prefectural University of Medicine, Kyoto, Japan.

Journal of Neuroendocrinology

|February 20, 2009

Summary

This summary is machine-generated.

The newly discovered sagittalis nucleus (SGN) in the hypothalamus shows structural and hormonal sex differences. These differences are influenced by sex steroids from birth and in adulthood, impacting reproductive functions.

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Electrophysiological Investigations of Retinogeniculate and Corticogeniculate Synapse Function

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Published on: August 7, 2019

Area of Science:

Neuroscience
Endocrinology
Reproductive Biology

Background:

The hypothalamus regulates numerous physiological processes, including reproduction.
Sex differences in brain structure and function are critical for sexually dimorphic behaviors.
The sagittalis nucleus (SGN) is a recently identified hypothalamic nucleus with potential roles in hormonal regulation.

Purpose of the Study:

To investigate the structural and physiological sex differences in the sagittalis nucleus (SGN) of the rat hypothalamus.
To determine the role of sex steroids in the establishment and maintenance of these SGN sex differences.
To explore the influence of the oestrous cycle on SGN neuroplasticity.

Main Methods:

Nissl staining to assess SGN structural volume.
Immunoreactivity for oestrogen receptor alpha (ERalpha-ir) to evaluate physiological differences.
Neonatal testosterone propionate treatment in female rats.
Ovariectomy and subsequent oestradiol replacement therapy in adult female rats.

Main Results:

The SGN is larger in adult male rats compared to females, indicating a structural sex difference.
Neonatal testosterone exposure masculinized the SGN in female rats.
Adult ovariectomy increased ERalpha-ir in the SGN of females, abolishing the sex difference.
Oestradiol replacement restored ERalpha-ir levels in ovariectomized females.
Adult female SGN exhibits oestrous cycle-dependent variations in ERalpha-ir.

Conclusions:

The SGN displays significant structural and physiological sex differences.
These differences are influenced by early-life and adult sex steroid exposure.
The SGN is a key target for sex steroid action, mediating hormonal regulation of sexually differentiated functions.