Examples of nervous tissue in the following topics:
-
- Nervous tissue is the main component of the nervous system, which includes the brain, spinal cord, and nerves.
- Nervous tissue is one of four major classes of tissues.
- It is specialized tissue found in the central nervous system and the peripheral nervous system.
- The nervous system is responsible for the control of the body and the communication among its parts.
- Nervous tissue contains two categories of cells—neurons and neuroglia.
-
- The nervous system consists of nervous tissue, which is composed of two principal types of cells called neuron and neuroglia.
- Nervous tissue, one of the four main tissue types, is composed of neurons and supporting cells called neuroglia.
- There are six types of neuroglia—four in the central nervous system and two in the PNS.
- Satellite cells surround neuron cell bodies in the peripheral nervous system (PNS).
- Schwann cells surround all nerve fibers in the peripheral nervous system and form myelin sheaths around the nerve fibers.
-
- The function of muscle tissue (smooth, skeletal, and cardiac) is to contract, while nervous tissue is responsible for communication.
- Constriction of smooth muscle occurs under involuntary, autonomic nervous control in response to local conditions in the tissues.
- Nervous tissues are made of cells specialized to receive and transmit electrical impulses from specific areas of the body and to send them to specific locations in the body organized into structures called nerves.
- The main cell of the nervous system is the neuron.
- Describe the structure and function of nervous tissue; differentiate among the types of muscle tissue
-
- The four basic tissue types are epithelial, muscle, connective, and nervous tissue.
- Each tissue type has a characteristic role in the body:
- Nervous tissue provides a means of rapid internal communication by transmitting electrical impulses.
- Most organs contain more than one tissue type.
- Cells form tissues, and tissues form organs.
-
- The human body consists of four types of tissue: epithelial, connective, muscular, and nervous.
- Epithelial tissue covers the body, lines all cavities, and composes the glands.
- In its role as an interface tissue, epithelium accomplishes many functions, including:
- Protection for the underlying tissues from radiation, desiccation, toxins, and physical trauma.
- Regulation and excretion of chemicals between the underlying tissues and the body cavity.
-
- The peripheral nervous system is able to repair and regenerate itself, but the central nervous system is incapable of doing so.
- Neuroregeneration refers to the regrowth or repair of nervous tissues, cells, or cell products.
- Injury to the peripheral nervous system immediately elicits the migration of phagocytes, Schwann cells, and macrophages to the lesion site in order to clear away debris such as damaged tissue.
- Unlike peripheral nervous system injury, injury to the central nervous system is not followed by extensive regeneration.
- Micrograph of a nerve with a decrease in myelinated nerve fibres (pink) and an abnormal increase in fibrous tissue (yellow), as may be seen in nerve injuries.
-
- Nervous tissue first arose in wormlike organisms approximately 550 to 600 million years ago.
- In most types of vertebrate animals, it consists of two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS).
- The PNS includes motor neurons (mediating voluntary movement), the autonomic nervous system (comprising the sympathetic nervous system and the parasympathetic nervous system, which regulate involuntary functions), and the enteric nervous system (a semi-independent part of the nervous system whose function is to control the gastrointestinal system).
- The nervous system performs several functions simultaneously.
- Some organisms, such as sea sponges, lack a true nervous system.
-
- The peripheral nervous system develops from two strips of tissue called the neural crest, running lengthwise above the neural tube.
- In vertebrates, the first sign of the nervous system is the appearance of a thin strip of cells along the center of the back, called the neural plate.
- The inner portion of the neural plate (along the midline) is destined to become the central nervous system (CNS), the outer portion the peripheral nervous system (PNS).
- At this point the future CNS appears as a cylindrical structure called the neural tube, whereas the future PNS appears as two strips of tissue called the neural crest, running lengthwise above the neural tube.
- The neural tube will give rise to the central nervous system, while the neural crest will give rise to the peripheral nervous system.
-
- The basic unit of the nervous system is the neuron.
- The nervous system can be divided into two major parts—the central nervous system (CNS) and the peripheral nervous system (PNS).
- The PNS can be further subdivided into the autonomic nervous system and the somatic nervous system.
- It supplies nerves to ("innervates") cardiac and smooth muscle tissue.
- The nervous system of the human body, including the brain and spinal cord (central nervous system) and all the nerves of the body (peripheral nervous system).
-
- The enteric nervous system (ENS) is a subdivision of the autonomic nervous system (ANS) that directly controls the gastrointestinal system.
- The gastrointestinal (GI) system has its own nervous system, the enteric nervous system (ENS).
- The mucosa and epithelial tissue associated with the submucosal plexus also have sensory nerve endings that feed signals to both layers of the enteric plexus.
- These tissues also send information back to the sympathetic pre-vertebral ganglia, the spinal cord, and the brain stem .
- An illustration of neural control of the gut wall by the autonomic nervous system and the enteric nervous system.