Answer:
Suckling by the calf
creates a neuroendocrine reflex which results in .increase of oxytocin from the
neurohypophysis. Oxytocin is synthesised in the hypothalamus in specific
nuclei, the paraventricular nucleus and the supra optic nucleus (a cluster of
nerve cells in the brain is often called a nucleus).
Neurons in this
region (hypothalamic nuclei) synthesise the oxytocin precursor and package it
into vesicles. The oxytocin concentration in the blood normally, gets increased
within 1-2 min, after the udder stimulation.
It brings
about contraction of smooth muscles of the udder resulting in the milk flow. A
direct intra-udder function of oxytocin like hormone would do the same
function.
It can be
summarised as follows
Udder (suckling
stimulus) Brain
(hypothalamus) Neurohypophysis
Blood
(oxytocin) Udder
(smooth muscles) Milk
flow.
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