The nervous system consists of two main parts: the central nervous system and the peripheral nervous system:

The central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of the nerve fibers that

branch off from the spinal cord and extend to all parts of the body, including the neck and arms, torso, legs, skeletal muscles and internal organs.

The brain sends messages through the spinal cord and nerves of the peripheral nervous system to control the movement of the muscles and the function of internal organs.

The basic working unit of the nervous system is a cell called a neuron. The human brain contains about 100 billion neurons. A neuron consists of a cell body containing the nucleus, and special extensions calledaxons (pronounced AK-sonz) and dendrites (pronounced DEN-drahytz).

Neurons communicate with each other using axons and dendrites. When a neuron receives a message from another neuron, it sends an electrical signal down the length of its axon. At the end of the axon, the electrical signal is converted into a chemical signal, and the axon releases chemical messengers called neurotransmitters (pronounced noor-oh-TRANS-mit-erz).

The neurotransmitters are released into the space between the end of an axon and the tip of a dendrite from another neuron. This space is called a synapse (pronounced SIN-aps). The neurotransmitters travel the short distance through the synapse to the dendrite. The dendrite receives the neurotransmitters and converts them back into an electrical signal. The signal then travels through the neuron, to be converted back into a chemical signal when it gets to neighboring neurons.

Motor neurons transmit messages from the brain to control voluntary movement. Sensory neurons detect incoming light, sound, odor, taste, pressure, and heat and send messages to the brain. Other parts of the nervous system regulate involuntary processes, such as the release of hormones like adrenaline, dilation of the eye in response to light, or regulation of the digestive system, which are involved in the function of the body’s organs and glands.

The brain is made up of many networks of communicating neurons. In this way, different parts of the brain can “talk” to each other as well as work together to send messages to the rest of the body.

ESP is most commonly called the "sixth sense." It is sensory information that an individual receives which comes beyond the ordinary five senses sight, hearing, smell, taste, and touch. It can provide the individual with information of the present, past, and future; as it seems to originate in a second, or alternate reality. 

ESP or extrasensory perception is perception occurring independently of sight, hearing, or other sensory processes.People who have extrasensory perception are said to be psychic. Some think that everyone has ESP; others think it is a talent that only special folks have. Some think that animals (see below) orplants have ESP.The term ESP was popularized by J. B. Rhine, who began investigating paranormal phenomena at Duke University in 1927.ESP refers to telepathy, clairvoyance (remote viewing),precognition, and, in recent years, clairaudience.The existence of ESP and other paranormal powers such aspsychokinesis (PK), are disputed, though systematic experimental research on these subjects, known collectively as psi,  has been ongoing for over a century in a field known as parapsychology.Most of the evidence for ESP, however, is anecdotal. The anecdotes consist of two parts: the experience itself and the interpretation of it. A story may be true, but the attempt to make sense or give psychic meaning to the story often seems to the skeptic to exceed the bounds of reasonableness.

Pituitary GlandThis gland is often referred to as the "master gland." It greatly influences other organs in the body, and its function is vital to the overall well-being of a person. The pituitary gland produces several hormones. In fact, the front part of it,

commonly called the anterior pituitary, produces the following types of hormones: -Growth hormone: This hormone promotes growth in childhood. For adults, it helps to maintain healthy muscle and bone mass.-Prolactin: In women, it stimulates milk production. In males, low levels are linked to sexual problems; however, most males make no use of the hormone.-Adrenocorticotropic: This hormone promotes the production of cortisol, which helps to reduce stress, maintain healthy blood pressure and more.-Thyroid-stimulating hormone: Just as the name implies, this hormone helps to regulate the body's thyroid, which is crucial in maintaining a healthy metabolism.-Luteinizing hormone: In women, this hormone regulates estrogen. In men, it regulates testosterone.-Follicle-stimulating hormone: Found in both men and women. It stimulates the releasing of eggs in women and helps ensure the normal function of sperm production in men.The back part of the pituitary gland is called the posterior pituitary. It produces the following two hormones:-Oxytocin: This hormone causes pregnant women to start having contractions at the appropriate time and also promotes milk flow in nursing mothers.-Antidiuretic hormone: Commonly referred to as vasopressin, this hormone helps to regulate water balance in the body.When the pituitary gland doesn't operate in a healthy manner, this can lead to pituitary disorders.HypothalamusThe hypothalamus is in control of pituitary hormones by releasing the following types of hormones: - Thyrotrophic-releasing hormone- Growth hormone-releasing hormone- Corticotrophin-releasing hormone- Gonadotropin-releasing hormone ThymusThis gland secretes hormones that are commonly referred to as humoral factors and are important during puberty. The role of these hormones is to make sure a person develops a healthy immune system. Pineal Gland

The pineal gland releases melatonin, which helps the body recognize when it is time to go to sleep. Researchers continue to learn more about this gland.

 TestesFound in men, this gland produces testosterone, which promotes the growth of the penis as a male gets older as well as facial and body hair. It also deepens the voice of a male at a certain age. Other functions of testosterone include:- Maintaining sex drive- Promoting production of sperm- Maintaining healthy levels of muscle and bone mass       OvariesFound in women, this gland produces both estrogen and progesterone, which promote the development of breasts. They also help a woman maintain healthy menstrual periods.    ThyroidFound in both women and men, the thyroid controls a person's metabolism. It is located in the front of the neck. Adrenal GlandsThis gland helps to control blood sugar. In addition, also helps your body do the following:

- Promoting proper cardiovascular function- Properly utilizing carbohydrates and fats- Helps distribute stored fat- Promotes healthy gastrointestinal functions ParathyroidThis gland is vital to proper bone development because it helps control both calcium and phosphorous levels in the body. The parathyroid gland is actually a group of four small glands located behind the thyroid gland.  Pancreas

The main function of the pancreas is to maintain healthy blood sugar levels. It is a large gland located behind the stomach.