session 31. recognize the major divisions of the nervous system describe how the cns controls...
TRANSCRIPT
CENTRAL NERVOUS SYSTEM OVERVIEW
Session 31
Objectives
Recognize the major divisions of the nervous system
Describe how the CNS controls sensation, musculature, and other body systems
Describe how the brain is protected by meninges
Explain how blood flows into and out of the skull
Describe CSF: what it is, how it is produced, how it is reintegrated
Divisions of NS
Affect all structures:
muscles, blood vessels, organs,
etc
Functional Divisions:
involuntary vs voluntary
NS can be divided by anatomical
relationships, or Functional purposes
Nervous System
Autonomic
Parasympathetic Sympathetic
Somatic
Somatic NS consists of:
A. Skin sensory info
B. Joint position info
C. Voluntary motor control
D. Involuntary motor control
Skin se
nsory
info
Joint p
osition in
fo
Voluntary m
otor c
ontrol
Involunta
ry moto
r contro
l
25% 25%25%25%
Divisions of NS
Anatomical divisions: Central NS Peripheral NS
Somatic and Autonomic systems only overlap in the PNS (one nerve contains both) in the Cranial Nerves!
The cranial nerves:
A. Contain only autonomic info
B. Contain only somatic info
C. Contain both autonomic and somatic info
D. Are in the CNS
Contain only auto
nomic ...
Contain only somati
c info
Contain both auto
nomic...
Are in th
e CNS
25% 25%25%25%
Information going toward the brain is afferent
A. TrueB. False
True
False
50%50%
Spinal Cord
Your patient is quadriplegic. He/she must have damage to:
A. The spinal cord in the cervical region
B. The spinal cord in any region
C. The spinal nerves in the cervical region
D. The spinal nerves in any region
The spinal c
ord in
the ce
r...
The spinal c
ord in
any re...
The spinal n
erves in th
e ...
The spinal n
erves in any .
..
25% 25%25%25%
Objectives
Recognize the major divisions of the nervous system
Describe how the CNS controls sensation, musculature, and other body systems
Describe how the brain is protected by meninges
Explain how blood flows into and out of the skull
Describe CSF: what it is, how it is produced, how it is reintegrated
Internal Carotid and Vertebral Arteries
Ventricles (CSF)
Choroid Plexus
Sinuses
Brain Tissue (Capillaries, BBB)
Internal Jugular Vein
CSF
Filtered by choroid plexus Fills ventricles and SAS
fluid protection, hydration, buoyancy
Removes toxins and waste products of metabolism
Drains back into blood through sinuses
CSF and Sleep
Study recently measured speed of CSF flow during waking and sleeping hours in mice
CSF flow increases dramatically during sleep, while size of brain cells decrease subtly
Hypothesis is that sleep is necessary to flush the brain of toxic buildup that occurs during the day
Which of the following are NOT located in the SAS?
A. ArteriesB. VeinsC. CSFD. Nerves
Arterie
sVeins
CSF
Nerves
25% 25%25%25%
A patient didn’t get enough sleep. Which of the following is false?
A. She has excess waste products in her brain
B. Her NS suffers – and this affects thought processes, motor control, and autonomic functions
C. She may believe she is functioning normally
D. None of these are falseShe has e
xcess
waste pr..
.
Her NS su
ffers – an
d this
...
She may b
elieve sh
e is fu
...
None of these
are fa
lse
25% 25%25%25%
Objectives
Recognize the major divisions of the nervous system
Describe how the CNS controls sensation, musculature, and other body systems
Describe how the brain is protected by meninges
Explain how blood flows into and out of the skull
Describe CSF: what it is, how it is produced, how it is reintegrated