Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Nervous Histology

16.2--Histology of Nervous Tissue

Neurons Electrical excitability -- ability to respond to stimulus and convert it to nerve impulse
Nerve Impulse Action Potential propagates along surface of neuron due to movement of ions between neuron and interstrital fluuid
Cell Body Nucleus + cytoplasm. Typical organelles + Nissl Bodies
Nissl Bodies Clusters of RER, important for protein synth and repair, transmission of nerve impulses and reception
Neurofibrils Intermediate filament bundles; support cell shape
Microtubules Movement of materials between cell body and axon
Lipofuscin Pigment, yellow brownish granules
Somatic Gemmules (Spines) Bumps on plasma membrane; increase surface area for nerve cell interactions
Initial segment Part of axon closest to hillock; location of nerve impulse arisal -- trigger zone (free of Nissl Bodies).
Axon Collaterals Side branches
Axon Terminal Arborizations Division of axon into terminal branches
Axosomatic Axon end to Somatic cell body
Axoaxonic Pre axon end to post axon
Electrical Synapse Gap junctions via connexins; rapid, uniform, coordinated movement (ex. heart, stomach)
Multipolar Neurons Multiple Dendrites, one axon
Bipolar Neuron One dendrite, one axon
Unipolar Sensory; Split into peripheral process and central process. Cell body branches off between axon and dentrite.
Neuroglia Constitute about 1/2 volume of CNS. Don't carry nerve impulse, Have ability to divide
CNS--Astrocyte Protoplasmic (short branches) in gray matter; fibrous (long unbranched) in white matter. Support neurons via microfilaments, create blood brain barrier, secrete growth chemicals in embryo, maintain chemicals of nerve impulse, learning and memory
CNS--Oligodendrocytes Smaller astrocytes. Form and maintain protective covering around CNS axons
Pia Matter Thin membrane around brain and spinal cord.
CNS--Microglia Slender processes with spinelike projections. Originate in red bone marrow and migrate. Phagocytes. Remove cellular debris, microbes, and damaged tissue
CNS--Ependymal Cells Cuboidal to columnar cells -- single layer. Line ventricles of brain and central canal of spinal cord. Assist and circulate cerebrospinal fluid.
PNS--Schwann Cells Flat cells--encircle axons. Form myelin sheath. 1:1 ratio of cell to axon portion.
PNS--Satellite Cells Surround cell bodies of neurons of PNS ganglia. Structural support + exchange of materials between neuronal cell bodies and interstitial fluid.
White Matter Aggregations of myelinated and unmyelinated axons of many neurons.
Gray Matter Neuronal cell bodies, dendrites, unmyelinated axons, axon terminals, and neuroglia.
Nucleus (CNS) Cluster of nerve cell bodies ~to Ganglion in PNS
Tract (CNS) Cluster of axons and nerve fibers; connect spinal cord up and down the brain
2 Reasons of Lack of Neurogeneration inhibitory influence from neuroglia (oligodendrocytes--myelin); absence of growth stimulating cues
Created by: 100000434525601



Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards