Term
| Where does the sensory information enter? |
|
Definition
|
|
Term
| Where does the motor information exit? |
|
Definition
|
|
Term
True or Flase
All Spinal Neres are Mixed; meaning having both sensory and mortor pathways. |
|
Definition
|
|
Term
| When the nerve is still in the spinal column, are they mixed? |
|
Definition
| No. Within the Spinal Column, the CNS, the nerves are EITHER sensory (dorsal) or motor (ventral) |
|
|
Term
True or Flase
All Cranial Nerves are mixed, both sensory and motor. |
|
Definition
FALSE
Only SOME of the cranial nerves are mixed. |
|
|
Term
| Spinal Nerve Roots have 2 divisions. Name them. TB pp 429-430 |
|
Definition
Ventral and Dorsal Roots
Every Spinal Nerve is attached to the spinal cord by these roots. |
|
|
Term
|
Definition
Located in the Front of the Spinal Column.
Receive Sensory Information. |
|
|
Term
|
Definition
Located in the Front of the Spinal Column.
Send Motor Information. |
|
|
Term
|
Definition
A fast, Involuntary action in response to a stimulus.
It is the simplest form of integration.
Some are Innate - natural and born with, however most are learned. |
|
|
Term
|
Definition
Located only in the CNS.
They connect sensory neurons with motor neurons.
They connect ascending tracts with descending tracts. |
|
|
Term
|
Definition
Bundles of axons in the PNS
All spinal nerves and many cranial nerves are mixed; meaning having both motor and sensory neurons |
|
|
Term
|
Definition
Nerves within the CNS. Bundles of axons in the CNS.
Most Tracts contain fibers going in ONE direction; ascending or decending |
|
|
Term
|
Definition
Made of glial cells. Contains a large lipid content contributing to white appearance.
Multilayered glial wrappings that speed up electrical impulses, and prevent "short circuits."
Wraps around axons and most neurons.
Each glial cell only wrapes a small portion of an axon - there are gaps.
The electrical impulses go even faster when "jumping" the unmyelinated gaps. |
|
|
Term
White and Grey Matter
TB 411 |
|
Definition
White Matter = Myelinated wrapped portion of axons
Grey Matter = Unmyelinated portion of axons - creating gaps |
|
|
Term
|
Definition
Glia cells in the PNS that make myelin
(hint: Think Swans have wings like appendages. Appendages are found in the PNS) |
|
|
Term
|
Definition
Means, "little trees"
Glia cells in the CNS that make myelin |
|
|
Term
|
Definition
A progressive Autoimmune disease that causes progressive destruction of myelin sheath in CNS.
This disease slows the nerve impulse conduction.
"Multiple" = affects multiple areas of the PNS; "Sclerosis" = hardening, plaque forming, brittleness |
|
|
Term
| What is the the shortest pathway from a stimulus to a predictable response? |
|
Definition
|
|
Term
| Name the 7 steps of a Reflex: |
|
Definition
1. Stimulus - any change in the environment (internal and external)
2. Sensory Receptors are stimulated - a dendrite
3. Sensory Neuron - conducts a nerve impulse toward (afferent) the CNS's Dorsal Root
4. Integration Center - The CNS (can just be the spinal cord. The sensory neurons communicates with interneurons to motor neurons.
5. Motor Neurons - Ventral Root. Cariies impulse away (efferent) from CNS to an effector.
6. Effector - a muscle or a gland
7. Response - Muscle contracts or relaxes; Gland secretes or stops secreting. |
|
|
Term
| What is the main function of the nervous system? |
|
Definition
| Stimulus - Integration - Response |
|
|
