Q.Which of the following hormone is not secreted under the influence of pituitary gland?
a. thyroxine
b. insulin
c. oestrogen
d. glucocorticoids

Often called the 'master gland' (though it is itself controlled by the hypothalamus), the pituitary is a small ovoid gland seated in the sella turcica of the sphenoid bone, linked to the hypothalamus by the infundibulum stalk. It has two structurally different lobes: the glandular adenohypophysis (anterior lobe, from embryonic Rathke's pouch) and the neural neurohypophysis (posterior lobe, an outgrowth of the hypothalamus itself, storing hormones made elsewhere rather than making its own).

The anterior lobe secretes six tropic hormones: GH (drives tissue growth and metabolism), TSH (drives the thyroid), ACTH (drives the adrenal cortex), FSH (drives gamete/follicle maturation), LH (drives testosterone production in males and ovulation/corpus luteum function in females — FSH+LH together are the gonadotropins), and LTH/prolactin (drives milk secretion). The posterior lobe releases two hormones that are actually made in the hypothalamus and simply stored here: vasopressin (ADH), which conserves water via the kidney and raises blood pressure, and oxytocin, which triggers uterine contraction during labour and milk ejection during nursing.