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"Axon Axons send impulses down their body. Impulses jump between exposed areas on the axon not covered by the myelin sheath called the nodes of Ranvier. The myelin sheath is made by glial cells. Axons are covered in spots in myelin sheath made by oligodendrocytes in the central nervous system (CNS), or Schwann cell... |
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"Axon Most axons carry messages in the form of action potentials which start in the cell body of a neuron and travel down the axon. Axon potentials are terminated at the point where axons make contact with synaptic vesicles. The axon's body has a negative charge because of charged potassium ions and a positive char... |
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"Chemical synapse Neurons use electrical signals to carry information. These signals are called action potentials. There are an estimated 86 billion neurons in the average human brain. Neurons don't act alone. They need to connect to other neurons and pass messages between each other. The electrical signal cannot p... |
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"Cerebrospinal fluid Cerebrospinal fluid (CSF) bathes and protects the central nervous system (the brain and the spinal cord). \"Cerebro\" means \"brain\"; \"spinal\" is a short version of \"spinal cord\"; and fluid is a liquid.",
"Cerebrospinal fluid CSF protects the brain by acting like a cushion. Without CSF,... |
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"Movement The brain has several areas that project directly to the spinal cord. At the highest level is the primary motor cortex. This is a strip of tissue at the back of the frontal lobe. This tissue sends a massive projection directly to the spinal cord, through the pyramidal tract. This allows for precise volunt... |
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"Pre-frontal cortex The most typical psychological term for functions carried out by the prefrontal cortex area is executive function. This is the ability to work out conflicting thoughts. It determines good and bad, better and best, same and different, consequences of current activities, working toward a goal, pre... |
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"Sensation In the visual system Light enters the eyes through the cornea. It then passes through the pupil, and is refracted by the crystalline lens of the eyes. Light is then channeled through the vitreous humour and then on to the retina. In the retina, there are two kinds of cells, rods and cones. Rods see black... |
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"Necrosis Necrosis is a medical condition in which parts of a person's body die, turn black, and fall off. This happens when the there is not enough blood reaching the tissues. This can happen for many reasons including injury, poisons, bacteria or radiation damage. The dead tissue will not grow back.",
"Calcium ... |
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"Pituitary gland The pituitary gland consists of two parts: the anterior pituitary and the posterior pituitary. It is functionally linked to the hypothalamus by the pituitary stalk (also called the infundibulum).",
"Pituitary gland The posterior pituitary is actually an extension of the hypothalamus. Neurosecreto... |
["Schizophrenia There are many risk factors that may cause a person to develop schizophrenia. They i(...TRUNCATED) |
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