The ans is part of the peripheral nervous system and it controls many organs and muscles within the body. Histology of the nervous system of man and vertebrates. Peripheral nervous system ganglia, peripheral nerves, peripheral nerve. Note the initial portions of the dendrites and axon that arise from the neuronal body.
Answers are provided at the end of the questions 1. Modified cell membrane that allows for more rapid conduction o histology of nervous tissue. Peripheral nervous system pns peripheral nerves and ganglia. The central nervous system cns, composed of the brain and spinal cord. The nervous system is comprised of two major parts, or subdivisions, the central nervous system cns and the peripheral nervous system pns.
The central nervous system consists of the brain and spinal cord. Transmits information to the processing areas of the brain and spine 3. Scattered around the neuron are many neuroglial cells, which in addition to neurons are the. The nervous system functions of the nervous system 1. Each neuron has hundreds of interconnections with other neurons, forming a very complex system for processing information and generating responses. Histology of the central nervous system toxicologic pathology. Gathers information from both inside and outside the body sensory function 2. Cns is composed of the brain located in the cranial cavity and the spinal cord located in the vertebral cavity, which serve as the main control centers for all body activities. Nervous tissue is the subject of intense interest, not only because of its complexity, but because it is the seat of thought, emotion, and behavior. Four basic types of tissues in the body epithelium 90% of tumors connective tissue muscular tissue nervous tissue. Nervous tissue contains two basic categories of cells. For the first time, the who classification of cns tumors uses molecular parameters in addition to histology to define many tumor entities, thus formulating a concept for how cns. This work evolved from a series of invited lectures that were published in spanish in 1904.
The debate began when camillo golgi refined the silver stain and used it to demonstrate, for the first time, the complexity of constituents and connections in the nervous system. The cns has various centers located within it that carry out the sensory, motor and integration of data. Junqueiras basic histology text and atlas 14th edition pdf free download. The nervous system is basically bruised by one of the four basic types of tissues of the body, the nervous tissue, being distributed throughout the body. Nervous system is specialized for the rapid communication of information from one region of the body to another nervous system is divided anatomically into two major components central nervous system cns consists of the brain and spinal cord.
Th ere are spaces within the brain called ventricles. Nervous system divisions of the nervous system the human nervous system consists of the central nervous system cns and the peripheral nervous system pns. This lab manual was created for anatomy and physiology i at the university of georgia under a textbook transformation grant and revised through a scaling up oer pilot grant. Junqueiras basic histology text and atlas 14th edition. This lab will be limited to the study of the basic features of neurons and glial cells specific organs composed of neurons, including the retina of the eye and the organ of corti of the inner ear, will be studied in the sensory systems lab, in conjunction with the. Thus, we will just be considering only a broad overview of the subject.
The following questions are designed for introductory drill. The intent of this article is to assist pathologists inexperienced in examining central nervous system cns sections to recognize normal and abnormal cell types. Dark neurons are the most common histologic artifact but, with experience, can readily be distinguished from degenerating eosinophilic neurons. Peripheral nervous system pnsall cranial and spinal nerves and their associated roots and ganglia functional pns divisions. This is a section of the spinal cord revealing the cell body of one of the large alpha motor neurons. Cell bodies of motor neurons reside in cns brain or spinal cord their axons sheathed in spinal nerves extend all the way to their skeletal muscles autonomic system. Objectives overview of the central and characteristics of the peripheral nervous system characteristics of neurons and support cells. This page is specifically focussed on the histologic appearance, for anatomy see forebrain, midbrain, hindbrain, cranial nerves, spinal cord and cns development spinal cord.
Nervous system is a uniquely designed organ system of our body. This em image shows a schwann cell associated with several small axons but without myelinating the axons. Histology helper nervous system histology histology helper. Pdf the intent of this article is to assist pathologists inexperienced in examining central nervous system cns sections to recognize normal and. This presentation is highlighting over the cellular configuration of this system. Lobes and lobules lobes are located btw adjacent renal columns with peripheral limits within medulla being the interlobar arteries a renal lobule is defined as a portion of the kidney containing those nephrons that are drained by a. In most situations, we are unaware of the workings of the ans because it functions in an involuntary, re. Both neurons and glia have fine processes projecting from the cell body, which generally cannot be resolved in the light microscope without special staining techniques. They exist in various forms and are widely distributed throughout the peripheral and central parts of the nervous system. They provide physical support, nutrients, defense, insulation and reabsorption of neurotransmitters in the nervous system.
Pdf histology of the central nervous system researchgate. Central nervous system cns consists of the brain and spinal cord. The intent of this article is to assist pathologists inexperienced in examining central nervous system cns sections to recognize normal and abnormal cell types as well as some common artifacts. Schwann cells begin to wrap themselves around the axon in jelly roll fashion. The organs the viscera of our body, such as the heart, stomach and intestines, are regulated by a part of the nervous system called the autonomic nervous system ans. The study of nervous system histology could easily comprise the entire subject matter of this course and a couple more. The axons make contact with other neurons or muscle cells at a specialization called a synapse where the impulses are either electrically or chemically transmitted to other neurons or various target cells e. The peripheral nervous system pns, composed of all the nervous tissue outside the cns. The manual contains labs on cells, histology, the integumentary system, the skeletal system, the nervous system, muscles, and the senses. An astrocyte is a supporting cell seen in the central nervous system. Somatic sensory fibres convey impulses from skin, sk transmits impulses from the cns to effector organs. Histology of the nervous system of man and vertebrates history of neuroscience, no 6 2 volume set 1st edition by s. They do not necessarily represent the quality of questions which will appear on the unit evaluation. This is a proofofconcept manifold text based on the complete pdf and word.
In unmyelinated nerves, schwann cells can associate with. Processes the information in the brain and spine integration function 4. These are the supportive cells of the nervous tissue. Alright, now in this part of the article you will be able to access the junqueiras basic histology 14th edition pdf using our direct link which has been mentioned at the end of this article. The nervous system is extraordinarily complex, and it is therefore impossible to cover it in its entirety in a single laboratory. The 2016 world health organization classification of. The central nervous system cns is composed of the brain and the spinal cord. Its major functions are to integrate sensory information, and to initiate and coordinate efferent responses. The human nervous system, by far the most complex system in the body, is formed by a network of many billion nerve cells neurons, all assisted by many more supporting cells called glial cells. An extension of these observations was his support of a hypothesis, probably derived from the cell theory of schwann, that neurons were connected in a continuous. The nervous system pdf the nervous system pdf free download, the nervous system pdf, the nervous system ebook content in a series of intriguing essays ranging over terror, state fetishism, shamanic healing in latin america, homesickness, and the place of the tactile eye in both magic and modernity, anthropologist michael taussig puts into representational. Unmyelinated axons em schwann cells and oligodendrocytes can also associate with axons but not wrap them in myelin sheaths.
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