Facts about optic neuritis. Optic neuritis can affect your vision and even cause pain. When the nerve fibers become inflamed, the optic nerve can also start to swell. This swelling typically affects one eye, but can affect both at the same time. Optic neuritis can strike both adults and children.
The most important controller of TSH secretion is thyroid-releasing hormone. Thyroid-releasing hormone is secreted by hypothalamic neurons into hypothalamic-hypophyseal portal blood, finds its receptors on thyrotrophs in the anterior pituitary and stimulates secretion of TSH.
Understanding the TRH Test. To understand how the TRH Stimulation Test works, it's first helpful to quickly review how the various brain hormones interact with the thyroid. Your hypothalamus is a gland in your brain that secretes thyrotropin-releasing hormone (TRH). When TRH is released, it stimulates your pituitary gland -- also in the brain -- to release thyroid stimulating hormone (TSH). TSH stimulates the thyroid itself to make thyroid hormones.