Ebook Handbook of general anatomy (4/E): Part 2
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Ebook Handbook of general anatomy (4/E): Part 2
Ebook Handbook of general anatomy (4/E): Part 2
7Nervous SystemNervous system is the chief controlling and coordinating system of the body. It controls and regulates all activities of the body, whet Ebook Handbook of general anatomy (4/E): Part 2ther voluntary' or involuntary, and adjusts the individual (organism) to the given surroundings.This is based on the special properties of sensitivity, conductivity and responsiveness of the nervous system.The protoplasmic extensions of the nerve cells form the neural pathways called nerves. The ner Ebook Handbook of general anatomy (4/E): Part 2ves resemble the electricity wires. Like the electric current flowing through the wires, the impulses (sensory and motor) are conducted through the neEbook Handbook of general anatomy (4/E): Part 2
rves.The sensory' impulses arc transmitted by the sensory' (afferent) nerves from the periphery (skin, mucous membranes, muscles, tendons, joints, and7Nervous SystemNervous system is the chief controlling and coordinating system of the body. It controls and regulates all activities of the body, whet Ebook Handbook of general anatomy (4/E): Part 2system to the periphery' (muscles and glands) (Fig. 7.1).Thus the CNS is kept continuously informed about the surroundings (environment) through various sensory impulses, both general and special.The CNS in turn brings about necessary adjustment of the body byissuing appropriate orders which are pas Ebook Handbook of general anatomy (4/E): Part 2sed on as motor impulses to the muscles, vessels, viscera and glands. The adjustment of the organism to the given surroundings is the most important fEbook Handbook of general anatomy (4/E): Part 2
unction of the nervous system, without which it will not be possible for the organism to survive.Parts of Nervous SystemThe nervous system is broadly 7Nervous SystemNervous system is the chief controlling and coordinating system of the body. It controls and regulates all activities of the body, whet Ebook Handbook of general anatomy (4/E): Part 2ven below.A. Central nervous system (CNS) includes:1Brain or encephalon, which occupies cranial cavity, and contains the higher governing centres (Fig. 7.2).2Spinal cord or spinal medulla, which occupies upper two-thirds of the vertebral canal, and contains many reflex centres.Fig. 7.1: Afferent and Ebook Handbook of general anatomy (4/E): Part 2 efferent pathways through the spinal cordFig. 7.2: Brain and spinal cordB. Peripheral nervous system (PNS) is subdivided into the following two compoEbook Handbook of general anatomy (4/E): Part 2
nents.1Cerebrospinal nervous system is the somatic component of the peripheral nervous system, which includes 12 pairs of cranial nerves (Fig. 7.3) an7Nervous SystemNervous system is the chief controlling and coordinating system of the body. It controls and regulates all activities of the body, whet Ebook Handbook of general anatomy (4/E): Part 2nctions.2Peripheral autonomic nervous system is the visceral component of the peripheral nervous system, which includes the visceral or splanchnic nerves that are connected to the CNS through the somatic nerves. It innervates the viscera, glands, blood vessels and nonstriated muscles, and mediates t Ebook Handbook of general anatomy (4/E): Part 2he visceral functions.The cerebrospinal and autonomic nervous systems differ from each other in their efferent pathways. Table 7.1 shows comparison ofEbook Handbook of general anatomy (4/E): Part 2
thetwo systems.Table 7.1. Comparison of cerebrospinal and peripheralautonomic nervous systemsCerebrospinal nervousPeripheral autonomic nervoussystems7Nervous SystemNervous system is the chief controlling and coordinating system of the body. It controls and regulates all activities of the body, whet Ebook Handbook of general anatomy (4/E): Part 2preganglionic and postganglionic)organ (skeletal muscles)with an intervening ganglion for theNeuronrelay of the preganglionic fibre. The1 axoneffector organ (viscera) are suppliedSkeletal muscleby the postganglionic fibreCELL TYPES OF NERVOUS SYSTEMThe nervous tissue is composed of two distinct type Ebook Handbook of general anatomy (4/E): Part 2s of cells:7Nervous SystemNervous system is the chief controlling and coordinating system of the body. It controls and regulates all activities of the body, whet7Nervous SystemNervous system is the chief controlling and coordinating system of the body. It controls and regulates all activities of the body, whetGọi ngay
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