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Related Experiment Videos

The milk ejection pathway in brain studied with the 2-deoxyglucose method.

R C Sutherland, G Fink

    Brain Research
    |August 29, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    The milk ejection reflex involves specific neural pathways. Suckling activates brain regions like the paraventricular and supraoptic nuclei in anesthetized rats, but not conscious ones, suggesting stress influences this reflex.

    Area of Science:

    • Neuroscience
    • Physiology

    Background:

    • The milk ejection reflex is crucial for maternal-infant bonding and nutrition.
    • Understanding the neural control of this reflex is essential for reproductive health research.

    Purpose of the Study:

    • To investigate the neural pathways and brain regions activated during the milk ejection reflex using the 2-deoxyglucose (2DG) method.
    • To compare the effects of suckling and mammary nerve stimulation on brain metabolic activity in rats.

    Main Methods:

    • Experiments were conducted on Wistar female rats, 9-11 days post-partum.
    • Relative metabolic activity (RMA) was measured using the 2DG method in conscious and urethane-anesthetized rats.
    • Effects of suckling and mammary nerve stimulation were assessed, with control groups for each condition.

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    Main Results:

    • Suckling significantly increased RMA in the paraventricular (PVN) and supraoptic nuclei (SON) of anesthetized rats, but not conscious rats.
    • Mammary nerve stimulation, causing milk ejection, increased RMA in the PVN, SON, pituitary, and spinothalamic tract.
    • The ascending pathway from the mammary nerve was traced to the midbrain via the spinothalamic tract.

    Conclusions:

    • Suckling activates afferent terminals in the PVN and SON, while direct mammary nerve stimulation activates cell bodies in these nuclei.
    • Stress may inhibit the milk ejection reflex in conscious animals.
    • The spinothalamic tract is involved in the ascending pathway of the milk ejection reflex.