nervous_system_notes_packet - Name THE NERVOUS SYSTEM 9.1 Introduction A Neurons = masses of nerve cells that transmit information to other nerves

nervous_system_notes_packet - Name THE NERVOUS SYSTEM 9.1...

This preview shows page 1 - 3 out of 8 pages.

Name:_________________________ THE NERVOUS SYSTEM 9.1 Introduction A. Neurons = masses of nerve cells that transmit information to other nerves, tissues or cells (nerve impulses) 1. Cell Body - contains the nucleus and two extensions 2. Dendrites - shorter, more numerous, receive information 3. Axons - single, long fiver which conducts impulses away from the cell body B. The nervous system is divided into two parts: 1. Central Nervous System (CNS) - brain and spinal cord 2. Peripheral Nervous System (PNS) - peripheral nerves through the body - includes 31 pairs of spinal nerves - includes 12 pairs of cranial nerves 9.2 Three Basic Functions 1. Sensory Function - gathers info about changes occurring within and around the body - Sensory receptors, at ends of peripheral nerves send signals (nerve impulses) to the CNS. Sensory Neuron 2. Integrative Function - information is "brought together," interpreted, to create sensations, create thoughts, add to memory, make decisions, etc. Association neuron or interneuron 3. Motor Function - responses to signals (impulses). Signals sent from the CNS to effectors (muscles or glands). The goal is usually to maintain stable conditions (especially internal) - Homeostasis. Motor neurons. - Somatic Nervous System (skeletal muscles) - Autonomic Nervous System (smooth muscles, glands) C. Neurons: Nerve cells. Unique structure - cell body with many extensions or processes (nerve "fibers") which conduct impulses. There are two types of processes: 1. Dendrites - shorter, more numerous. These, along with the cell body, form the receptive surfaces of neurons. 2. Axons - single, long "fiber" which conducts impulse away from the cell body. Sometimes it is "branched" (collaterals). End has many fine branches. 9.3 Neuroglial Cells (neuroglia) - supportive tissue of the nervous system (more numerous than neurons). Five types 1. Microglial Cells 2. Oligodendrocytes 3. Astrocytes 4. Ependymal Cells 5. Schwann cells *Myelin Sheaths
Image of page 1
Name:_________________________ 9.4 Neurons Axon Dendrite Neurofibril Chromatophilic substance Myelin
Image of page 2
Image of page 3

You've reached the end of your free preview.

Want to read all 8 pages?

  • Fall '16
  • Berkley

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

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes