The third category of neurons is known as the interneurons, or association neurons; they connect the motor and sensory neurons in neural pathways. Ependymal cells are glial cells that line the central cavities of the brain and the spinal cord; the beating of their cilia helps to circulate the cerebrospinal fluid that fills those cavities and forms a protective cushion around the CNS.
Classification Neurons may be classified either according to how they function or according to their structure.
The somatic nervous system allows us to consciously, or voluntarily, control our skeletal muscles. The speech area is located at the junction of the temporal, parietal, and occipital lobes; the speech area allows one to sound out words.
Central nervous system CNS. Because the myelin sheath is formed by many individual Schwann cells, it has gaps, or indentations, called nodes of Ranvier. Neuroglia include many types of cells that generally support, insulate, and protect the delicate neurons; in addition, each of the different types of neuroglia, also simply called either glia or glial cells,has special functions.
Each axon terminal is separated from the next neuron by a tiny gap called synaptic cleft. The sensory, or afferent division, consists of nerves composed of nerve fibers that convey impulses to the central nervous system from sensory receptors located in various parts of the body.
Process and interpret sensations and make decisions Motor output: The cell body is the metabolic center of the neuron; it has a transparent nucleus with a conspicuous nucleolus; the rough ER, called Nissl substance, and neurofibrils are particularly abundant in the cell body.
Interneurons make up most of the neurons in your body The mammillary bodies, reflex centers involved in olfaction the sense of smellbulge from the floor of the hypothalamus posterior to the pituitary gland. About 10 to 1 ratio of them relative to neurons and these glial cells can divide.
This includes the sympathetic division fight or flight and parasympathetic division rest and digest which include the autonomic nervous system. The axons of these motor neurons form the major voluntary motor tract- the corticospinal or pyramidal tract, which descends to the cord.
It then effects a response by activating muscles or glands effectors via motor output. It can help stimulate or inhibit the activities of other systems to help maintain a constant internal environment.
The visual area is located in the posterior part of the occipital lobe. This function depends on the ability of the nervous system to detect, interpret, and respond to changes in the internal and external conditions.The human central nervous system (CNS) is the most complex and elegant computing device that exists.
It receives and interprets an immense array of sensory information, controls a variety of simple and complex motor behaviors, and engages in. About MyAccess. If your institution subscribes to this resource, and you don't have a MyAccess Profile, please contact your library's reference desk for information on how to gain access to this resource from off-campus.
Start studying Chapter 11 "fundamentals of the Nervous System and Nervous Tissue". Learn vocabulary, terms, and more with flashcards, games, and other study tools. Human A&P I: Fundamentals of the Nervous System and.
Nervous Tissue. I. Overview of the nervous system - master control and communication system of. The Nervous System is the body's most rapid means of maintaining homeostasis (maintenance of constant internal environment) Structural Classification of Nervous System Central nervous system (CNS) (Fig ).
fundamentals of nervous system & nervous tissue Study of nervous system and receptors is called neurology. In humans, physiological functions are coordinated by both the nervous and endocrine systems.5/5(5).Download