Q.Oxytocin and vasopressin, though released from the posterior pituitary, are actually synthesised by neurosecretory cells of the

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Oxytocin and vasopressin are synthesised by hypothalamic neurosecretory cells and only stored/released from the posterior pituitary.

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(b) Hypothalamus

Unlike the anterior pituitary, which itself manufactures its six hormones, the posterior pituitary does not synthesise any hormone of its own. Oxytocin and vasopressin (ADH) are actually produced by neurosecretory cells in the supraoptic and paraventricular nuclei of the hypothalamus; these cells send long axons down the infundibulum into the posterior pituitary, where the two hormones are stored at the axon terminals and released into the blood only when the appropriate nervous signal (e.g. suckling, for oxytocin; a rise in blood osmotic concentration, for vasopressin) arrives.

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(b) Hypothalamus

Recall that the posterior pituitary is neural tissue, not glandular tissue -- it is a storage/release site, so the true site of synthesis must be traced back to the hypothalamic neurosecretory cells whose axons terminate there.

Assuming the posterior pituitary manufactures its own hormones the way the anterior pituitary does -- only the anterior pituitary is a genuine hormone-synthesising gland; the posterior pituitary is a release site for hypothalamic hormones.