Muscle and nerve diagram of the human body
The nerves of the arm and hand perform a substantial two-fold role: commanding the intricate movements of the arms all the way down to the dexterous fingers, while also receiving the vast sensory information supplied by the sensory nerves of the hands and fingers. The movements of the arms must be fast, precise, and strong to complete the diverse activities the body engages in throughout the day. Even the tiny hand muscles, which perform very delicate and precise movements, are driven by about , neurons. Rapid conduction of sensory nerve signals from the hands provides critical information to the brain and feedback during precise activities.
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Major Muscles on the Front of the Body
Human body | Muscle system, Human muscular system, Muscular system anatomy
The sciatic nerve is the dominant nerve that innervates the lower back and the lower extremities. It travels from the lower spine, through the pelvis, and down each leg. It is the longest and widest nerve in the human body. The sciatic nerve primarily supplies the muscles of the lower leg, including the calf, ankle, and the back portion of the knee. It also supplies sensation to the sole of the foot, the ankle, the entire lower leg, and the back of the thigh. The sciatic nerve branches into different parts of the body along its path, hence its ability to supply such a large area of the body.
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Diagram of the Human Nervous System (Infographic)
This article describes the anatomy of the head and neck of the human body, including the brain, bones, muscles, blood vessels, nerves, glands, nose, mouth, teeth, tongue, and throat. The head rests on the top part of the vertebral column , with the skull joining at C1 the first cervical vertebra known as the atlas. The skeletal section of the head and neck forms the top part of the axial skeleton and is made up of the skull , hyoid bone, auditory ossicles , and cervical spine. The occipital bone joins with the atlas near the foramen magnum , a large hole foramen at the base of the skull.
Without muscle, humans could not live. The primary job of muscle is to move the bones of the skeleton, but muscles also enable the heart to beat and constitute the walls of other important hollow organs. Muscle movement happens when neurological signals produce electrical changes in muscle cells. During this process, calcium is released into the cells and brings about a short muscle twitch. Problems with the junction between the cells — called a synapse — can lead to neuromuscular diseases.
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