Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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The nervous system is composed of the brain, spinal cord, and nerves. The brain is divided into three main parts, cerebrum, cerebellum, and brain stem. The cerebrum, the larger part of the brain is divided into the left and right hemispheres, and each hemisphere is further divided into four lobes, the frontal lobe, parietal lobe, temporal lobe, and occipital lobe, with the help of bumps termed gyri and groves or fissures termed sulci. The central sulcus is present in between the frontal lobe and parietal lobe, the lateral sulcus between the frontal lobe and temporal lobe, and the parieto-occipital sulcus separates the parietal lobe from the occipital lobe.
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- Please break down and clarify. 1."The spinal cord is about 17 to 18 inches long. It lies inside the spinal column and extends from the occipital bone down to the bottom of the first lumbar vertebra. The H-shaped core of the spinal cord consists of gray matter and is composed mainly of dendrites and cell bodies of neurons. Columns of white matter form the outer portion of the cord and bundles of myelinated nerve fibers, called spinal tracts, make up the white columns. The spinal cord functions as the primary reflex center of the body." 2. "Thirty-one nerve pairs are generated from the spinal cord. Eight pairs are attached to the cervical section, twelve pairs are attached to the thoracic section, five pairs are attached to the lumbar section, five pairs are attached to the sacrospinal section, and one pair is attached to the coccygeal section. Spinal nerves have no special name, but rather a letter and number identify each; for example, C1 indicates the pair of nerves from the first…arrow_forwardThis image shows the frontal lobe in the ______ portion of the brain and the bottom of the image shows the occipital lobe (highlighted in orange) at the ______ portion of the brain.arrow_forwardCan you help me the name of the label of the brain?arrow_forward
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