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Collections of nerve cell bodies outside the central nervous system are called _____.
The Nervous System:
The two main components of the nervous system are the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consists of the brain and spinal cord, while the PNS is composed of the spinal, cranial and peripheral nerve fibers that extend out to the rest of the body. The PNS is very complex and is further subdivided into two parts: the motor (efferent) division and sensory (afferent) division. The motor division is then separated into the somatic nervous system (voluntary) and autonomic nervous system (involuntary).
Central Nervous System (CNS) Definition
- The central nervous system consists of the brain and spinal cord.
- The brain plays a central role in the control of most bodily functions, including awareness, movements, sensations, thoughts, speech, and memory.
- Some reflex movements can occur via spinal cord pathways without the participation of brain structures.
- The spinal cord is connected to a section of the brain called the brainstem and runs through the spinal canal.
- Cranial nerves exit the brainstem.
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- Nerve roots exit the spinal cord to both sides of the body.
- The spinal cord carries signals (messages) back and forth between the brain and the peripheral nerves.
- Cerebrospinal fluid surrounds the brain and the spinal cord and also circulates within the cavities (called ventricles) of the central nervous system.
- The leptomeninges surround the brain and the spinal cord.
- The cerebrospinal fluid circulates between 2 meningeal layers called the
- pia matter and
- the arachnoid
- (or pia-arachnoid membranes).
- The outer, thicker layer serves the role of a protective shield and is called the dura matter.
- The basic unit of the central nervous system is the neuron (nerve cell).
- Billions of neurons allow the different parts of the body to communicate with each other via the brain and the spinal cord.
- A fatty material called myelin coats nerve cells to insulate them and to allow nerves to communicate quickly.