18-Nervous System - Nervous System DR WAFAA SHUNNAQ Nervous Tissue Nervous tissue consists of two major kinds of cells a Neurons detect stimuli convert

18-Nervous System - Nervous System DR WAFAA SHUNNAQ Nervous...

This preview shows page 1 - 8 out of 39 pages.

Nervous System DR. WAFAA SHUNNAQ
Image of page 1

Subscribe to view the full document.

Nervous Tissue Nervous tissue consists of two major kinds of cells: a. Neurons detect stimuli, convert stimuli into nerve action potentials (nerve impulses), and conduct these messages to other neurons, muscle fibers or glands. neurons consist of: i. cell body which contains the nucleus and most other organelles ii. branched processes called dendrites iii. process called axon which conducts nerve impulses away from the cell body b. Neuroglia provide protection and support to the neurons.
Image of page 2
Image of page 3

Subscribe to view the full document.

Overview of the Nervous System The nervous system and the endocrine system are the body’s major control and integrating centers. Neurology is the study of the normal functioning and disorders of the nervous system. The major components of the nervous system include the brain, cranial nerves (and their branches), spinal cord, spinal nerves (and their branches), ganglia, enteric plexuses, and sensory receptors a nerve is a bundle of axons (plus associated connective tissue and blood vessels) located outside the brain and spinal cord ganglia are small masses of nervous tissue, consisting primarily of neuron cell bodies, that are located outside the brain and spinal cord enteric plexuses are networks of neurons located in the walls of GI tract organs; they help regulate digestive system activities sensory receptors are structures that monitor changes in the internal and external environment
Image of page 4
Organization of the Nervous System The nervous system consists of two major divisions: i. central nervous system (CNS) , which consists of the brain and spinal cord ii. peripheral nervous system (PNS), which consists of: [1] cranial nerves that emerge from the brain [2] spinal nerves that emerge from the spinal cord And other ??????????/ the PNS contains: [a] sensory or afferent neurons which transmit nerve impulses from sensory receptors to the CNS [b] motor or efferent neurons which transmit nerve impulses from the CNS to muscles and glands.
Image of page 5

Subscribe to view the full document.

Spinal Cord Anatomy Surrounding and protecting the nervous tissue of the spinal cord are: 1. the vertebral column 2. three spinal meninges (surrounding the brain and continuous with the spinal meninges are the cranial meninges), which include: i. the outermost meninx, called the dura mater ii. the middle meninx, the avascular arachnoid mater iii. the innermost meninx, the pia mater 3. a cushion of cerebrospinal fluid (produced in the brain)
Image of page 6
Meninges i. the outermost meninx, called the dura mater a. It is composed of connective tissue. b. It extends from the level of the foramen magnum to the second sacral vertebra. c. Surrounding it is the epidural space, which is filled with fat and connective tissue that provide additional protection for the spinal cord. ii. the middle meninx, the avascular arachnoid mater a. It consists of connective tissue with a spiderweb-like arrangement of collagen fibers and some elastic fibers.
Image of page 7

Subscribe to view the full document.

Image of page 8
  • Fall '16
  • spinal nerves

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask bonus questions You can ask questions ( expire soon) You can ask questions (will expire )
Answers in as fast as 15 minutes