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Parvocellular neurosecretory cells are small neurons within paraventricular nucleus (PVN) of the hypothalamus. The axons of the parvocellular neurosecretory cells of the PVN project to the median eminence, at the base of the brain, where their neurosecretory nerve terminals release peptides into blood vessels in the hypothalamo-pituitary portal system. The blood vessels carry the peptides to the anterior pituitary gland, where they regulate the secretion of hormones into the systemic circulation.
The parvocellular neurosecretory cells include those that make:
- Thyrotropin-releasing hormone (TRH), which acts as the primary regulator of TSH and a regulator of prolactin
- Corticotropin-releasing hormone (CRH), which acts as the primary regulator of ACTH 
- Vasopressin, which acts as a secondary regulator of ACTH secretion acting synergistically with CRH and a regulator of prolactin
- Oxytocin, which acts as a regulator of prolactin
- Neurotensin, which acts as a regulator of luteinizing hormone and prolactin
- ↑ Sawchenko, PE (1987 Dec 29). Evidence for differential regulation of corticotropin-releasing factor and vasopressin immunoreactivities in parvocellular neurosecretory and autonomic-related projections of the paraventricular nucleus.. Brain research 437 (2): 253-63.
- ↑ Kovács, KJ, Sawchenko, PE (1996 Jan). Sequence of stress-induced alterations in indices of synaptic and transcriptional activation in parvocellular neurosecretory neurons.. The Journal of neuroscience : the official journal of the Society for Neuroscience 16 (1): 262-73.
- ↑ Ghamari-Langroudi, M., Vella, K. R.; Srisai, D.; Sugrue, M. L.; Hollenberg, A. N.; Cone, R. D. (13 October 2010). Regulation of Thyrotropin-Releasing Hormone-Expressing Neurons in Paraventricular Nucleus of the Hypothalamus by Signals of Adiposity. Molecular Endocrinology 24 (12): 2366–2381.
- ↑ Lennard, DE, Eckert, WA; Merchenthaler, I (1993 Apr). Corticotropin-releasing hormone neurons in the paraventricular nucleus project to the external zone of the median eminence: a study combining retrograde labeling with immunocytochemistry.. Journal of neuroendocrinology 5 (2): 175-81.
- ↑ 5.0 5.1 5.2 Sawchenko, PE, Swanson, LW; Vale, WW (1984 Mar). Co-expression of corticotropin-releasing factor and vasopressin immunoreactivity in parvocellular neurosecretory neurons of the adrenalectomized rat.. Proceedings of the National Academy of Sciences of the United States of America 81 (6): 1883-7.
- ↑ 6.0 6.1 Horn, A. M., Robinson, I. C. A. F.; Fink, G. (1 February 1985). Oxytocin and vasopressin in rat hypophysial portal blood: experimental studies in normal and Brattleboro rats. Journal of Endocrinology 104 (2): 211–NP.
- ↑ 7.0 7.1 Freeman, ME, Kanyicska, B; Lerant, A; Nagy, G (2000 Oct). Prolactin: structure, function, and regulation of secretion.. Physiological reviews 80 (4): 1523-631.
- ↑ Johnston, CA, Negro-Vilar, A (1988 Jan). Role of oxytocin on prolactin secretion during proestrus and in different physiological or pharmacological paradigms.. Endocrinology 122 (1): 341-50.
- ↑ Watanobe, H, Takebe, K (1993 Apr). In vivo release of neurotensin from the median eminence of ovariectomized estrogen-primed rats as estimated by push-pull perfusion: correlation with luteinizing hormone and prolactin surges.. Neuroendocrinology 57 (4): 760-4.