SEER Training:Nerve Tissue
Although the nervous system is very complex, there are only two main types of cells in nerve tissue. The actual nerve cell is the neuron. It is the "conducting" cell that transmits impulses and the structural unit of the nervous system. The other type of cell is neuroglia, or glial, cell. Neurons Neurons, or nerve cells, carry out the functions of the nervous system by conducting nerve impulses. Each neuron has three basic parts: cell body (soma), one or more dendrites, and a single axon. Cell Body In many ways, the cell body is similar to other types of cells. Dendrites Dendrites and axons are cytoplasmic extensions, or processes, that project from the cell body. Axon An axon may have infrequent branches called axon collaterals. In the peripheral nervous system, the myelin is produced by Schwann cells. Neuroglia Neuroglia cells do not conduct nerve impulses, but instead, they support, nourish, and protect the neurons. Tumors
Brain and Nervous System
Listen All About the Brain The brain is made up of three main sections: the forebrain, the midbrain, and the hindbrain. 1. The Forebrain The forebrain is the largest and most complex part of the brain. The cerebrum contains the information that essentially makes us who we are: our intelligence, memory, personality, emotion, speech, and ability to feel and move. The cerebrum has right and left halves, called hemispheres, which are connected in the middle by a band of nerve fibers (the corpus collosum) that enables the two sides to communicate. The outer layer of the cerebrum is called the cortex (also known as "gray matter"). In the inner part of the forebrain sits the thalamus, hypothalamus, and pituitary gland. 2. The midbrain, located underneath the middle of the forebrain, acts as a master coordinator for all the messages going in and out of the brain to the spinal cord. 3. The hindbrain sits underneath the back end of the cerebrum, and it consists of the cerebellum, pons, and medulla.
What is the Nervous System?
By Dr Ananya Mandal, MD The nervous system is a complex network of nerves and cells that carry messages to and from the brain and spinal cord to various parts of the body. The nervous system includes both the Central nervous system and Peripheral nervous system. The Central nervous system The central nervous system is divided into two major parts: the brain and the spinal cord. The brain The brain lies within the skull and is shaped like a mushroom. the brain stem the cerebrum the cerebellum the diencephalon The brain weighs approximately 1.3 to 1.4 kg. There are two types of matter in the brain: grey matter and white matter. The brain stem The brain stem is also known as the Medulla oblongata. The cerebrum The cerebrum forms the bulk of the brain and is supported on the brain stem. The hemispheres are further divided into four lobes: Frontal lobe Temporal lobes Parietal lobe Occipital lobe The cerebellum This is located behind and below the cerebrum. The diencephalon Other parts of the brain
How does the nervous system work? - National Library of Medicine - PubMed Health
Nervous System
The nervous system is an organ system in charge of sending messages to and from the brain and spinal cord to and from all parts of the body. It consists of the central nervous system and the peripheral nervous system. Another important part of the nervous system is the sense organs to which a special page is devoted. Sense Organs Jobs of the nervous system It controls and coordinates the body functions. It receives sensory impulses from the sensory organs through sensory nerve fibers, analyzes and interprets this information and starts the motor impulses which are carried to muscles and glands which act on these impulses and cause the body to react. It helps the body learn from experience and stores these memories. It coordinates all parts of the body to keep everything in balance. Parts of the nervous system Central nervous system: Made up of the brain and the spinal cord. Peripheral nervous system: Neurons: These are nerve cells. Brain: Spinal Cord: Enteric nervous system: Diagram of the Cerebrum
Kimball's Biology Pages
Nervous System: Explore the Nerves with Interactive Anatomy Pictures
[Continued from above] . . . conditions inside and outside of the body and send this information to the CNS. Efferent nerves in the PNS carry signals from the control center to the muscles, glands, and organs to regulate their functions. Nervous TissueThe majority of the nervous system is tissue made up of two classes of cells: neurons and neuroglia. Neurons. Brain The brain, a soft, wrinkled organ that weighs about 3 pounds, is located inside the cranial cavity, where the bones of the skull surround and protect it. Spinal CordThe spinal cord is a long, thin mass of bundled neurons that carries information through the vertebral cavity of the spine beginning at the medulla oblongata of the brain on its superior end and continuing inferiorly to the lumbar region of the spine. NervesNerves are bundles of axons in the peripheral nervous system (PNS) that act as information highways to carry signals between the brain and spinal cord and the rest of the body. Dura mater. Sensory. Sympathetic.
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The brain is what it is because of the structural and functional properties of interconnected neurons. The mammalian brain contains between 100 million and 100 billion neurons, depending on the species. Each mammalian neuron consists of a cell body, dendrites, and an axon. The cell body contains the nucleus and cytoplasm. Dendrites extend from the neuron cell body and receive messages from other neurons. When neurons receive or send messages, they transmit electrical impulses along their axons, which can range in length from a tiny fraction of an inch (or centimeter) to three feet (about one meter) or more. The brain contains at least ten times more glia than neurons.
