4 ventricles in brain two lateral third and fourth

This preview shows page 3 - 4 out of 6 pages.

4 ventricles in brain, two lateral, third and fourth ventricle, this is where CFS is produced and circulates. The choroid plexus is in the lateral ventricles and is where the formation of CSF occurs. The dura folds and forms pocket called dura sinus which contain venous blood. At top and back of skull the indentations in dura sinus is called arachnoid villi/granulations (drains excess CFS into dura sinus to internal jugular artery into right side of heart) Mid Arachnoid Mater- covers blood vessels above pia mater (resembles spider web) Out Dura Mater- thick tough outer layer lining skull 16. Describe the basic structure of a neuron and the function of each part (90 pts). Functional system of the nervous system. Neurons are cells that receive and transmit signals Cell body - contains cytoplasm all organelles of other cells, contain nucleus (dna in nucleus) , build neurotransmitters (are chemical that allow two neuron to communicate and made of protein) - acetylcholine/parasympathetic, norepinephrine/sympathetic, serotonin, dopamine. (neurotransmitter travels through cytoplasm of axon and stored at end of axon) Axon - extension of cell body, transmit neuro information , has fatty insulation mylin Dendrites - extensions of the cell body, collect neuro information
Image of page 3

Subscribe to view the full document.

Axon hillock - a site where the electrical impulse is generated and sent down the axon . Myelin sheath - fatty insulates of axon no electrical current in myelin sheath and speeds up impulse (saltatory conduction) Nodes of Ranvier - space between myelin sheath where axon is exposed and electrical impulse is generated and will go from one space to the next. (electrolytes responsible for electrical impulse are sodium & potassium) 17. Describe a synapse and explain how nerves are able to communicate (90 pts). Synapse is where neurons communicate with each other. -At the end of an axon also known as the presynaptic membrane (transmit) don’t directly touch another dendrite or cell body also known as the postsynaptic membrane ( collect). There is a space between the cell membrane of the axon end and the cell membrane of the dendrite or cell body is known as the synaptic cleft . Neurons communicate through neurotransmitters, as an electrical impulse is sent down the axon and reaches the end “presynaptic membrane” are then neurotransmitters are released into the “synaptic space”. Embedded in the membrane of dendrites are specific neurotransmitter receptors to collect information and the neurotransmitter from the axon will bind with a specific neurotransmitter on a dendrite. MOA - enzyme that eats membrane off postsynaptic membrane and electrical impulse stops and neuron no longer fire. OR Neurotransmitter plucked off neurotransmitter receptor then brought back up into presynaptic membrane then broke down.
Image of page 4
You've reached the end of this preview.
  • Spring '14
  • StacyAker

{[ snackBarMessage ]}

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