The one process divides with one part acting as an axon and functioning as a dendrite. Unipolar neurons have one process extending from the cell body.These are seen in the eye's retina, the inner ear, and the olfactory (smell) area. Bipolar neurons have one axon and one dendrite.These are common in the brain and spinal cord. Multipolar neurons have one axon and several dendrites.According to structure, neurons may be multipolar neurons, bipolar neurons, and unipolar neurons: Neurons in the body can be classified according to structure and function. Nerves in the brain and spinal cord do not have a neurilemma and cannot recover when damaged. Its function is to allow damaged nerves to regenerate. The neurilemma is the layer of Schwann cells with a nucleus. The covering is continuous along the axons or dendrites except at the point of termination and the nodes of Ranvier. These are white segmented covering around axons and dendrites of many peripheral neurons. The neuron is covered with the Myelin Sheath or Schwann Cells. There is usually only one axon per neuron. AxonĪn axon is a long, thin process that carries impulses away from the cell body to another neuron or tissue. The dendrite's function is to carry a nerve impulse into the cell body. Motor neurons have multiple thick dendrites. The exception is a sensory neuron that has a single, long dendrite instead of many dendrites. The cell body has several highly branched, thick extensions that appear like cables and are called dendrites. The cell body is like any other cell with a nucleus or control center. There are three different parts of the neuron: A typical neuron has a cell body and long arms that conduct impulses from one body part to another. It is a specialized conductor cell that receives and transmits electrochemical nerve impulses. The neuron is the basic unit in the nervous system. It protects and nourishes the brain and spinal cord. The cerebrospinal fluid (CSF) circulates around the brain and spinal cord. The meninges offer protection to the brain and the spinal cord by acting as a barrier against bacteria and other microorganisms. The middle layer is the arachnoid, and the innermost layer is the pia mater. The meninges are three layers of membranes that cover the brain and the spinal cord. Other parts of the central nervous system It lies within the vertebral column, the collection of bones (backbone). The spinal cord is about 43 cm long in adult women and 45 cm long in adult men and weighs about 35-40 grams. Both motor and sensory nerves are located in the spinal cord. The spinal cord region from which a pair of spinal nerves originates is called the spinal segment. A pair of spinal nerves come out of each segment.
#Basic nerve cell in centeral nervos systemname series#
The spinal cord is composed of a series of 31 segments. The spinal cord is a long tube-like structure that extends from the brain. the pons acts as a pathway to higher structures it contains conduction pathways between the medulla and higher brain centers.the midbrain provides conduction pathways to and from higher and lower centers.Other parts of the brain include the midbrain and the pons: The hypothalamus is a smaller part of the diencephalon. The thalamus is where sensory and other impulses go and coalesce. The diencephalon includes the thalamus and hypothalamus. This is located behind and below the cerebrum. The hemispheres are further divided into four lobes: Each hemisphere controls the activities of the side of the body opposite that hemisphere. The cerebrum is divided into two hemispheres. The cerebrum forms the bulk of the brain and is supported on the brain stem. It is located between the pons and the spinal cord and is only about one inch long. The brain stem is also known as the Medulla oblongata. White matter in the brain carries impulses to and from grey matter. Cell bodies of neurons and neuroglia are in the grey matter. Grey matter receives and stores impulses. There are two types of matter in the brain: grey matter and white matter. It has nerve cells called the neurons and supporting cells called the glia.
The brain weighs approximately 1.3 to 1.4 kg. The brain consists of four principal parts: The brain lies within the skull and is shaped like a mushroom.
Neurotransmission - 3D Medical Animation Play The brain
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