The medulla oblongata is the lowest part of the brain stem, it merges into the spinal cord, includes important fiber tracts, and contains important control centers. Heart rate control, blood pressure regulation, breathing, swallowing and vomiting.Recticular formation, diffus mass of gray matter along the brain stem.he brain stem is about the size of a thumb in diameter and approximately 3 inches (approximately 7.5 cm) long. It structures are the midbrain, pons, and the medulla obongata. The midbrain is mostly composed of tracts of nerve fibers. The midbrain has two bulging fiber tract-cerebral peduncles.
Government disability insurance. All, part, or none of the disability benefits you receive through government disability insurance programs may be taxable. Social Security benefits: If the only income you had during the year was Social Security disability income, your benefit usually isn't taxable.
Implications. The purpose of Social Security tax is to fund Social Security survivors, disability and retirement insurance. If your net self-employment earnings are more than $106,800, you are only required to continue to pay the Medicare portion of the Social Security tax, the 2.9 percent, on your earnings.