Investigating Electromagnetism by Elizabeth Cregan

By Elizabeth Cregan

Electromagnetics are everywhere--inside our houses, in our desktops, even our televisions! Readers will discover the heritage of electromagnetics and the way they paintings via various photos and supportive textual content. The attention-grabbing proof and sidebars can have little ones excited and wanting to examine extra approximately issues similar to alternating and direct currents, electrical energy, magnetic fields, conductors, amps, volts, and turbines. Readers also will know about scientists like Nikola Tesla and Michael Faraday. that includes an obtainable thesaurus and index and a stimulating hands-on lab job, readers could be guaranteed to be excited and captivated from commencing to end!

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The autonomic nervous system is the part of the nervous system that controls and regulates the internal organs without any conscious recognition or effort. It is made up of two antagonistic (opposing) sets of neuronal tracts, known as the sympathetic and parasympathetic nervous systems, as well as a third neuronal network, known as the enteric nervous system, which involves the digestive organs. The peripheral nervous sysTem As in the central nervous system, peripheral nervous pathways are made up of neurons and synapses, the points at which one neuron communicates with the next.

The gray matter forms three pairs of horns throughout most of the spinal cord: (1) the dorsal horns, composed of sensory neurons, (2) the lateral horns, well defined in thoracic segments and composed of visceral neurons, and (3) the ventral horns, composed of motor neurons. The white matter forming the ascending and descending spinal tracts is grouped in three paired funiculi, or sectors: the dorsal or posterior funiculi, lying between the dorsal horns; the lateral funiculi, lying on each side of the spinal cord between the dorsal-root entry zones and the emergence of the ventral nerve roots; and the ventral funiculi, lying between the ventral median sulcus and each ventral-root zone.

An accessory obturator nerve supplies the pectineus muscle of the thigh and is sensory to the hip joint. The sartorius muscle and medial and anterior surfaces of the thigh are served by branches of the anterior division of the femoral nerve. The posterior division of the femoral nerve provides sensory fibres to the inner surface of the leg (saphenous nerve), to the quadriceps muscles (muscular branches), to the hip and knee joints, and to the articularis genu muscle. Sacral Plexus The ventral rami of L5 and S1–S3 form the sacral plexus, with contributions from L4 and S4.

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