KNEE

UR FULL OF

You're full of baloney/bologna. This is derived from the fact that "ur" is a chat abbreviation for "your" and the phrase "ur full of" is below "knee". When you pronounce it, it sounds like "you're full of baloney". Baloney is a colloquial name for bologna - you're full of baloney/bologna is a slang term.

Generally speaking, the first measurable brain waves can be captured on an electroencephalogram (EEG) around the 12th week of pregnancy.

Prior to that, the central nervous system of an embryo begins to develop in a sequence from "tail" to head. The brain tissue and the creation of a spinal cord are some of the early structures that begin the development process of the nervous system, but it will be longer before they are fully functioning.

In the fifth week after conception the first synapses begin forming in an embryo's spinal cord. Conception is traditionally defined as when the egg and sperm unite to form a new human being, initially called a zygote, however several years ago the American Association of Obstetrics and Gynecology decided to change the definition to a week later when the embryo implants in the uterus. To add to the confusion, obstetricians typically date pregnancy from about 3 weeks earlier at the time of the last menstrual period. Thus, it is very important to know what definitions are being used when studying prenatal (before birth) human development. Synapses are what connections of nerves are called. By the seventh week after the embryo begins development, these early neural connections permit the first movements of an embryo. The woman will not feel these movements but researchers can detect the movement through ultrasound imaging. These first movements do not involve fine motor movement but are trunk movements caused by the muscle and central nervous system development.

Other movements will follow--of the limbs (around eight weeks) and fingers (ten weeks), as well as some reflex movements such as hiccuping, stretching, yawning, sucking, swallowing, grasping, and thumb-sucking. By the end of the first trimester (first 3 months), a fetus's movement repertoire is remarkably rich, even though most pregnant women still feel none of it. Many women sense or feel the first fetal movements in the 5th and 6th months of the pregnancy; some may feel something as early as eighteen weeks of pregnancy.

Terminology:

A zygote is the first step in development of an embryo. The zygote formed from the union of 2 haploid cells (sperm and egg) to form one diploid cell. It is the first stage of the embryo. As the embryo is transported don the Fallopian tube to the uterus, further development occurs. At about one week, the blastocyst (name for that stage of embryonic development) implants in the uterine wall. 8 weeks after fertilization, when all organ systems have formed, the embryo is called a fetus up until birth, and then for the first 28 days after birth the medical term is neonate. These are the proper medical terms, but in English the term "baby" or "child" is used from the day the zygote is formed until a year - or several years - after birth. "Infant" can also be used for the first year after birth.

Some good things about having two brains:

• You can concentrate on doing 2 things at the same time.
• You can donate 1 for someone in need.
• If one of the brains gets damaged, you still have another one.
• You could be twice as smart, depending on whether you can get the brains to work together.
• Each brain could work with one ear, so you could concentrate on two conversations at the same time. (And talk to both of them too. Wow that would be a total mess. imagine each person talking to more than 1 person at the same moment!)
• You could sleep with one and let the other finish your homework at the same time.
• You could have great conversations with yourself.
• Someone would always understand your perspective.

Through years people have compared the brain to different inventions. In the past, the brain has been said to be like a water clock and a telephone. These days, the favorite invention that the brain is compared to is a computer. Some people use this comparison to say that the computer is better than the brain; some people say that the comparison shows that the brain is better than the computer. Perhaps, it is best to say that the brain is better at doing some jobs and the computer is better at doing other jobs.

Both use electrical signals to send messages the computer uses wires to carry messages and the Brain uses motor neurons. Both can do math and other logical tasks. The computer is faster at doing logical things and computations. However, the brain is better at interpreting the outside world and coming up with new ideas. Both need energy, the brain needs nutrients like oxygen and sugar for power; the computer needs electricity to keep working. Both can be damaged It is easier to fix a computer but there are no new or used parts for the brain Both a computer and a brain can get "sick" - a computer can get a virus and there are many diseases that affect the brain. The brain has built-in backup systems in some cases. If one pathway in the brain is damaged, there is often another pathway that will take over this function of the damaged pathway.