Biology Forum › Human Biology › Hypothalamin hormones
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- October 19, 2006 at 9:59 am #6046AmrikParticipant
i wanted to how hormones secreted by the hypothalamus reaches the posterior pituitary lobe…do they travel through the hypothalamic – hypopheseal artery? 🙂
- October 19, 2006 at 1:58 pm #56964Dr.SteinParticipant
I am sorry my dear, I got trouble with connection so I left you in YM without explaining this 🙁
Here, I pay my debt for you 😀
Hypothalamus consists of many neurons which secret hormones i.e. releasing factor (-RF/-RH) and inhibiting factor (-IF/-IH), called as nucleus (singular) or nuclei (plural). Thus the hormones are called as "neurohormones".
Nuclei supraorbitalis and nuclei paraventricularis are two of those nuclei, which have long axon. Their body cells locate in hypothalamus, while their axons pass thru the stalk (infundibulum) to reach posterior pituitary. Oxytocin and Vasopressin (ADH) are actually neurohormones secreted by those nuclei, NOT hormones secreted by posterior pituitary. Those hormones are stored there, because the terminal bulb of those nuclei locate in posterior part of pituitary. No blood vessels include in this case.
Here is the pic to give you more explanation:
Click the picture to see larger view - October 19, 2006 at 2:40 pm #56967AmrikParticipant
yupp….actually i have just noticed my mistake…i wanted to ask about anterior pituitary…but its also cleared now…hypothalamic – hypophoseal blood vessels (artery if i am not wrong) transport the hormones secreted by the hypothalamus directly to the anterior pituitary!
but this was something new…i knew only hormones travels through the axon to the posterior…others are new stuffs!
Thank you Doc!…i am compiling my information about the Endocrine gland…when i finish it i will send it to you..and if you are free you could tell me how it is and what all things i should add and remove, you know a teacher’s point of view is the best! - October 19, 2006 at 3:20 pm #56970Dr.SteinParticipant
From my pic, you also can see how hypothalamus connects anterior pituitary too, right? 😉
Sure, I always have time for everyone who wants to study. But not for the instant thing 😉 And I will do my best t help you. I love these kind of people 😉
Have you got my one-page handout? 🙂 Actually that’s an Introduction part. The rest will be longer and complicated. If you make a good paper of your Endocrine System, I will ask your permission to use it in my class. I will tell my students where I got the paper 😉
- October 19, 2006 at 4:20 pm #56974AmrikParticipant
Doc another question…in females LH not only causes ovulation but also the production of testosterone in the ovaries…these testosterone are converted into estrogen right? what converts them…i read somewhere that adjacent granulosa cells converts testosterone to estrogen…if it is correct what really is this adjacent granulosa cells? can you explain a bit more 😀
yup, its ok you can use it in your class, i would be delighted 🙂 …knowledge should be shared…nobody can steal your knowledge so why being a miser keeping it all by ourselves
- October 20, 2006 at 2:40 am #57015Dr.SteinParticipant
Yes, both in male and female, LH produces androgen, especially testosterone. In male, LH sometimes is called as ICSH (Interstitial Cell-Stimulating Hormone).
Yes, you are correct, in female, testosterone is secreted by granulosa cells a.k.a. follicle cells of the ovary. By the existence of enzyme aromatase, this male sex hormone is converted into estrogens. Three major estrogens are estradiol, estriol and estrone.
About granulosa cells or follicle cells, they are cells where oocyte is swaddled within its follicle (pocket).
Take a look at this figure.
Click the picture to get larger view.A figure of a developing ovarian follicle. The red cell in the centre is oocyte, the purple cells surrounds are follicle cells a.k.a. granulosa cells a.k.a granulocytes. The white part is follicle’s antrum (room) which contains follicle’s liquor, a viscous fluid that is rich in steroid reproductive hormones, especially androgens and estrogens.
- October 20, 2006 at 4:40 am #57030AmrikParticipant
Alright Doc…..Thanks alot!
- October 20, 2006 at 10:19 am #57039AmrikParticipant
sorry for duble posting but
Doc…What is the function of calcitonin? It is alright now…i already know it! - October 20, 2006 at 6:05 pm #57053MrMisteryParticipant
so LH and ICSH are the same thing? Are you sure doc? Cause if you are, i’m gonna call the ministery of eduacation and complain that the textbook they sent me is a piece of crap…
- October 21, 2006 at 2:57 am #57074AmrikParticipant
@Mr.Mistery
Andrew…..in your textbook what is the function of ICSH? - October 21, 2006 at 8:06 am #57084MrMisteryParticipant
it says "the antherior pituitary gland secretes LH and ICSH, which stimulate the secretion of testosteron"
…….. - October 22, 2006 at 2:23 am #57116Dr.SteinParticipantquote MrMistery:so LH and ICSH are the same thing? Are you sure doc?
Pretty sure! 😉
- October 22, 2006 at 2:25 am #57118Dr.SteinParticipantquote Amrik:sorry for duble posting but
Doc…What is the function of calcitonin? It is alright now…i already know it!It works in opposite with PTH secreted by parathyroid glands. OK. 8)
- October 22, 2006 at 7:09 am #57130AmrikParticipant
another question…is this information about testosterone function full? or have i missed out something?
quote :The interstitial cells in the testes produce and secretes the male sex hormone Testosterone. Testosterone is responsible for the development of secondary male sex characteristics also called the androgenic functions of testosterone. Some examples of these characteristics of this Testosterone is increased growth of body hair, beard growth, deep voice, growth of the Adam’s apple, shoulders widen and rib cage expands, increased production of sebaceous glands, development of the penis, aggressiveness, sexual behavior, libido, and the maturation of sperm. Testosterone accelerates muscle buildup, increases the formation of red blood cells, speeds up regeneration, and speeds up recovery time after injuries or illness. This Testosterone also stimulates the entire metabolism which results in the burning of body fat. - October 22, 2006 at 11:48 am #57140Dr.SteinParticipant
Yes, that’s the overview of its function. I made a classification of the function of androgen/testosteron into detail. I will upload it here after the holiday 🙂
- October 22, 2006 at 12:01 pm #57142AmrikParticipant
yeah…please do upload it
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