Regulation Of Reproduction Flashcards
What is the neural control after for all reproductive hormones?
Hypothalamus
Where is the hypothalamus located?
At the base of the brain
The hypothalamus is divided into what?
Surge center, tonic center, and the paraventricular nucleus
The surge center is involved in what?
Controlling LH in females
The hypothalamus is inherently what?
Female
What hormone drives defeminization of the surge center?
Testosterone produced by fetal testis
What hormone actually defeminizes the surge center?
Estradiol
What enzyme converts testosterone into estradiol?
Aromatase
What produces estradiol in females?
The ovaries
What protein binds to estradiol in females that prevents it from going past the blood-brain barrier to defeminire the surge center?
Alpha fetoprotein
What produces the alpha fetoprotein?
Yolk sac and fetal liver
Why can’t estradiol bind to testosterone in females?
Because it can’t get past the blood-brain barrier
What hormone is controlled by the hypothalamus in females that surges but it’s basal in males?
Luteinizing hormone
What part of the hypothalamus is responsible for the slow and steady response to stimulus?
The tonic Center
What part of the hypothalamus is responsible for oxytocin synthesis?
Paraventricular nucleus (PVN)
The hypothalamus is responsible for what hormone section?
GnRH
What separates the lateral portions of the hypothalamus?
The third ventricle
What surrounds the hypothalamus?
Sella turcica
What is the structure that prevents dilution of GnRH and provides a direct pathway into the anterior pituitary?
Hypothalamo- hypophyseal Portal system (hpp)
The neurohypophysis is involved in the synthesis of what?
Oxytocin
Oxytocin is directly released there?
Bloodstream
What are the chemical messengers that respond to external stimulus and translate a signal ut showed male reflexes or neuroendocrine reflexes?
Hormones
What do hormones interact with?
Receptors to secrete new products
The hormone interaction is between what?
The nervous system and the endocrine system.
The neuroendocrine reflexes target what?
The hypothalamus to release GnRH
After GnRH is released it acts on the anterior pituitary to release what?
FSH and LH for maintenance
The posterior pituitary releases oxytocin, but what structure synthesizes it?
The hypothalamus
Sensory neurons are what type of neurons and where do they take a signal?
They are atterent and take signals to the spinal cord
Efferent neurons take neural signals to?
Target tissues