The neurosecretory cells (neurons) of hypothalamus secrete hormones called neurohormones (releasing factors) which are summarised below. 

(i) Adrenocorticotropic releasing hormone (ACTRH) : It stimulates the anterior lobe of the pituitary gland to secrete adrenocorticotropic hormone (ACTH). 

(ii) Thyrotropin releasing hormone (TRH): It stimulates the anterior lobe of the pituitary gland to secrete thyroid stimulating hormone (TSH) or thyrotropin. 

(iii) Somatotropin Releasing hormone (SRH) : It stimulates the anterior lobe of the pituitary gland to release growth hormone (GH) or somatotropin. 

(iv) Growth inhibiting hormone (GIH): This hormone is also called somatostatin (SS). It inhibits the secretion of growth hormone from the anterior lobe of the pituitary gland. 

(v) Gonadotropin releasing hormone (GnRH) : It stimulates the anterior lobe of the pituitary gland to secrete two gonadotropic hormones : follicle stimulating hormone (FSH) and luteinizing hormone (LH).