Mini-Unit: Nervous System Flashcards
(42 cards)
Neuroglial Cells
“Support cells”
Schwann Cells
Neuroglial cells that cover the axon
Neurons
Nerve Cells
Myelin Sheath
Schwann cells create a covering called:
Nodes of Ranvier
The spaces between Schwann cells
Failure of the neuron to transmit impulses
Defects in the myelin sheath result in what?
The sodium-potassium pump helps to create electrical gradients.
How do neurons make electricity?
Neurotransmitters
When an action potential reaches the end of an Axon, vesicles release chemicals called _____.
Synapse
Space between two neurons
Central Nervous system
Brain and Spinal cord
Peripheral nervous system
- 43 paired nerves that connect organs
- 12 pairs of cranial nerves
- 31 pairs of spinal nerves
Reflex arc
The best way to see the CNS and PNS in action is to observe what is known as ______
Somatic nerves
Control conscious activities and use one neuron to connect to the CNS
Autonomic nerves
Control unconscious activities and used to neurons to connect to the CNS
Sympathetic division
These nerves typically have a stimulating effect on organs
These nerves use adrenaline, also called norepinephrine, as a neurotransmitter
When these nerves are operating, you’re preparing for battle
Parasympathetic division
These nerves typically have a relaxing effect on organs
These nerves use acetylcholine as their neurotransmitter
When these nerves are operating, you’re relaxing after a battle
Meninges
The brain is covered by triple membrane called the ______
Cerebrum and cerebellum
What are the two sections of the brain?
Frontal lobe
Controls intelligence and primary motor area
Parietal
Primary sensory area
Occipital
Vision
Temporal
Hearing and memory
Cerebral cortex
The surface of the cerebrum
Gyrus
The high spots of the cerebral cortex
