Anatomy Unit 12 Nervous System Essay
1. Distinguish the difference between neuron, neuroglial cells, Schwann cells, neurofibrils, and astrocytes.
Neuron: masses of nerve cells in nervous tissue
Neuroglial Cells: provide neurons physiological requirements (fill spaces, give support to neurons)
Schwann Cells: larger axons of peripheral neurons enclosed in sheaths
Neurofibrils: thin, long fibrils that run through body of neuron and extends to axon and dendrites; gives neuron shape and support
Astrocytes: cells found between neurons; provide structural support
2. What is the difference between dendrites and axons?
Dendrites: short, branched fibers and neurons main receptive surface; carries impulses to the cell …show more content…
13. The brain is divided into 3 major sections, what are they?
Cerebrum, cerebellum, brain stem
14. Which of the 3 deals with higher mental functions/thinking? cerebrum 15. Which one deals with visceral activities?
Brain stem (medulla oblongata)
16. Which one deals with voluntary muscular movements? cerebellum 17. What is affected by Parkinson’s and Huntington’s?
Movement of the body
18. What are the 2 divisions of the peripheral nervous system?
Somatic nervous system & autonomic nervous system
19. What is the outermost portion of the cerebrum called?
20. How do drugs that decrease a membrane's permeability to sodium affect the perception of pain? How to they affect nerve impulses? When are these types of drugs typically used?
It prevents impulses from passing through the affected regions, & when it reaches the brain, it doesn't inform it of sensations of touch and pain usually used during surgeries
21. How does caffeine stimulate the activity of the nervous system?
Stimulant; increases alertness, reduces fine motor coordination
22. How do amphetamines stimulate the nervous system?
They cause the release of norepinephrine
23. What is an analgesic?
A person who has lost the ability to sense pain but hasn't lost consciousness
24. Between which two layers of the meninges is cerebrospinal fluid found?
Arachnoid and pia mater
25. What is the difference between quadriplegia and paraplegia?
Quadriplegia: paralysis of all 4