File Name: anatomy and physiology nervous system test .zip
The nervous system is responsible for our thoughts, our emotions, our senses, and our movements. The brain, nerves, and spinal cord are all members of this important process. How much do you know about the nervous system?
The picture you have in your mind of the nervous system probably includes the brain , the nervous tissue contained within the cranium, and the spinal cord , the extension of nervous tissue within the vertebral column. The brain is contained within the cranial cavity of the skull, and the spinal cord is contained within the vertebral canal of the vertebral column. The peripheral nervous system is so named because it is in the periphery—meaning beyond the brain and spinal cord.
A nerve is an enclosed, cable-like bundle of nerve fibres called axons , in the peripheral nervous system. A nerve transmits electrical impulses and is the basic unit of the peripheral nervous system. A nerve provides a common pathway for the electrochemical nerve impulses called action potentials that are transmitted along each of the axons to peripheral organs or, in the case of sensory nerves , from the periphery back to the central nervous system. Each axon within the nerve is an extension of an individual neuron , along with other supportive cells such as some Schwann cells that coat the axons in myelin. Within a nerve, each axon is surrounded by a layer of connective tissue called the endoneurium. The axons are bundled together into groups called fascicles , and each fascicle is wrapped in a layer of connective tissue called the perineurium. Finally, the entire nerve is wrapped in a layer of connective tissue called the epineurium.
The brain and the spinal cord are the central nervous system, and they represent the main organs of the nervous system. The spinal cord is a single structure, whereas the adult brain is described in terms of four major regions: the cerebrum, the diencephalon, the brain stem, and the cerebellum. The regulation of homeostasis is governed by a specialized region in the brain. The coordination of reflexes depends on the integration of sensory and motor pathways in the spinal cord. The iconic gray mantle of the human brain, which appears to make up most of the mass of the brain, is the cerebrum [link]. The wrinkled portion is the cerebral cortex , and the rest of the structure is beneath that outer covering. There is a large separation between the two sides of the cerebrum called the longitudinal fissure.
The nervous system consists of the brain, spinal cord, sensory organs, and all of the nerves that connect these organs with the rest of the body. Together, these organs are responsible for the control of the body and communication among its parts. The brain and spinal cord form the control center known as the central nervous system CNS , where information is evaluated and decisions made. The sensory nerves and sense organs of the peripheral nervous system PNS monitor conditions inside and outside of the body and send this information to the CNS. Efferent nerves in the PNS carry signals from the control center to the muscles, glands, and organs to regulate their functions.
The central nervous system consists of the brain and spinal cord. This article gives a brief overview of the central nervous system CNS. We will look at the types of cells involved, different regions within the brain, spinal circuitry, and how the CNS can be affected by disease and injury. Here are some key points about the central nervous system. More detail and supporting information is in the main article.
The nervous system is a complex network of nerves and nerve cells neurons that carry signals or messages to and from the brain and spinal cord to different parts of the body. It is made up of the central nervous system and the peripheral nervous system. The central nervous system CNS is made up of the brain and spinal cord.
The peripheral nervous system PNS is one of two components that make up the nervous system of bilateral animals , with the other part being the central nervous system CNS. The PNS consists of the nerves and ganglia outside the brain and spinal cord. The peripheral nervous system is divided into the somatic nervous system and the autonomic nervous system.
The nervous system comprises the central nervous system, consisting of the brain and spinal cord, and the peripheral nervous system, consisting of the cranial, spinal, and peripheral nerves, together with their motor and sensory endings. The central nervous system is composed of millions of nerve and glial cells, together with blood vessels and a little connective tissue. The nerve cells, or neurons, are characterized by many processes and are specialized for reception and transmission of signals. The glial cells, termed neuroglia, are characterized by short processes that have special relationships to neurons, blood vessels, and connective tissue. The brain is the enlarged, head end of the central nervous system; it occupies the cranium, or brain case. The term cerebrum L. Encephalon, of Greek origin, is found in such terms as encephalitis, which means inflammation of the brain.
Тут что-то не так, - наконец сказала. - Не думаю, что это ключ. Фонтейн глубоко вздохнул.
Что случилось, Сью. У тебя ужасный вид.
На самом деле, - прервал его Дэвид, - Танкадо имел в виду первичную, а не главную разницу. Его слова буквально обожгли Сьюзан. - Первичное! - воскликнула. И повернулась к Джаббе. - Ключ - это первичное, то есть простое число. Подумайте. Это не лишено смысла.
Мидж. - Он постарался ее успокоить, входя вслед за ней в комнату заседаний к закрытому жалюзи окну. - Пусть директор разбирается. Она посмотрела ему в. - Ты представляешь, что произойдет, если выйдет из строя система охлаждения ТРАНСТЕКСТА. Бринкерхофф пожал плечами и подошел к окну. - Электроснабжение уже наверняка восстановили.
Да я бы ничего и не взял у умирающего. О небо. Только подумайте. Беккер встревожился: - Так кольца у вас. - Боже мой, конечно.
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