Home Discussion Forum i read somewhere about a gland called pineal gland?

i read somewhere about a gland called pineal gland?

i read tht this gland secretes a hormone called “melatonin” which controls the growth of gonads…and this secretion is controlled by the conditions of light as detected by eyes… so my questio is tht i some one has got one of his eyes dormant/lazy(an eye that can not recieve full light )by birth so will it effect the growth of his gonads?

(Powered by Yahoo Answers)


  1. The pineal gland is located in your head, under the brain. It produces a large number of hormones, which tell other glands to work or stop working.
    Melatonin regulates sleep.
    TSH signals the thyroid to produce T3 and T4, which can influence your height and weight.
    HGH produced during childhood and adolescence will effect how tall you will grow.
    Hormones released by the pineal gland also control the amount of teststerone and estrogen released by your body, which also effect height, bone density, bone thickness, muscle mass, and hair growth.
    However, your height is influenced just as much by the amounts of calcium and protein in your diet while growing as by hormones produced during your period of growth.

  2. The pineal gland or epiphysis synthesizes and secretes melatonin, a structurally simple hormone that communicates information about environmental lighting to various parts of the body. Ultimately, melatonin has the ability to entrain biological rhythms and has important effects on reproductive function of many animals. The light-transducing ability of the pineal gland has led some to call the pineal the “third eye”.
    The pineal gland is a small organ shaped like a pine cone (hence its name). It is located on the midline, attached to the posterior end of the roof of the third ventricle in the brain. The pineal varies in size among species; in humans it is roughly 1 cm in length, whereas in dogs it is only about 1 mm long. (If you are a medical student and able to look at a brain, to observe the pineal, reflect the cerebral hemispheres laterally and look for a small grayish bump in front of the cerebellum). Histologically, the pineal is composed of “pinealocytes” and glial cells. In older animals, the pineal often contains calcium deposits (known as “brain sand”). Light exposure to the retina is first relayed to the suprachiasmatic nucleus of the hypothalamus, an area of the brain well known to coordinate biological clock signals. Fibers from the hypothalamus descend to the spinal cord and ultimately project to the superior cervical ganglia, from which post-ganglionic neurons ascend back to the pineal gland. Thus, the pineal is similar to the adrenal medulla in the sense that it transduces signals from the sympathetic nervous system into a hormonal signal. There is a pathway from the retinas to the hypothalamus called the retinohypothalamic tract. It brings information about light and dark cycles to a region of the hypothalamus called the suprachiasmatic nucleus (SCN). From the SCN, nerve impulses travel via the pineal nerve (sympathetic nervous system) to the pineal gland. These impulses inhibit the production of melatonin. When these impulses stop (at night, when light no longer stimulates the hypothalamus), pineal inhibition ceases and melatonin is released. The pineal gland is therefore a photosensitive organ and an important timekeeper for the human body. This is also why blind people may sometimes go through long periods without sleep or develop otherwise irregular sleeping patterns. The precursor to melatonin is serotonin, a neurotransmitter that itself is derived from the amino acid tryptophan. Within the pineal gland, serotonin is acetylated and then methylated to yield melatonin. Only in the case that a person is without a pineal gland or with a lesion that prevents the pineal from receiving photoinformation, will this have any possibility of affecting the reproductive organs. To describe a lazy eye, it is an eye that diverges in gaze. A lazy eye is formally called strabismus. A lazy eye (strabismus) can be due to esotropia (cross-eyed) or to exotropia (wall-eyed). The danger of the condition is that the brain comes in time to rely more on one eye than the other and that part of the brain circuitry connected to the less-favored eye fails to develop properly, leading to amblyopia (blindness) in that eye. The gonads are the precursors of the testes in males and ovaries in females. They initially develop from the mesothelial layer of the peritoneum. The gonads are controlled hormonally by luteinizing hormone (LH) and follicle-stimulating hormone (FSH) secreted by the anterior pituitary gland. The anterior pituitary gland’s excretion of LH and FSH are, in turn, controlled by the hypothalamus’ gonadotropin-releasing hormone.
    I add three links, one each for the pineal gland, lazy eye and gonads.
    Hope this helps
    matador 89


Please enter your comment!
Please enter your name here