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Unit 6 Central NERVOUS
SYSTEM
1. Name the 2 DIVISIONS of the
Nervous System
• CENTRAL
brain and spinal cord
• PERIPHERAL
all nerves outside
brain and spinal cord
2 branches
Somatic- nerves that
serve skeletal system
and sense organs
Autonomic- serve
smooth muscles and
heart
2. Terms
• Nerve- bundle of axons wrapped in
connective tissue
• Ganglion- cell bodies grouped together
outside brain or spinal cord
• Tract- pathway for axons
• Nuclei- mass of cell bodies ( ganglion)
The 3 parts of a neuron
• Dendrite- conduct
impulse toward cell
body
• Axon- conduct
impulse away from
cell body
• Cell body
motor
sensory
3. 4 Basic Processes of the
Nervous System
• Reception- stimuli
• Transmission- Sensory input- from area to
brain Afferent
• Integration- sums up input to allow brain to
make decision
• Motor output- efferent- cause response
3 TYPES of NEURONS
• Sensory- afferent
• Motor- efferent
• Interneuron- in CNS (brain and spinal
cord)
4. 7 Divisions of the Brain
• Brain stem
Medulala Oblongata- regulate
heartbeat, breathing, BP
Pons- bridge between
Cerebellum and CNS
Midbrain- vision, hearing,
touch
• Cerebellum- movement
• Hypothalmus- hunger, sleep,
thirst
• Thalmus- all sensory except
smell
• Cerebrum- largest, conscious
thought
LOBES of BRAIN
• FRONTAL- motor
(FM)
• TEMPORAL- speech
and hearing
(EAR)
• PARIETAL- sensory
(PS)
• OCCIPITAL- visual
( eyes in back of head)
Misc Brain INFO
• Right side of brain controls left side of
body
• Right side of brain- art, music, imagination
• Left side of brain- logic, math, science
• Brain stem is the size of your thumb
5. Spinal Cord
Functions
• Reflex
• Transmission
• Tube protected by
vertebrae and CSF
(clear)
CNS Protection
Spinal cord
Brain
• Vertebrae
• CSF
• Bones of Skull
• CSF
• Menninges (grey
matter)
10. Vocab
• Efferent- motor
• Afferent- sensory
• Ganglia- mass of nerve
cells outside CNS
Vocab Continued
• White Matter- covered in Myelin
• Grey Matter- no Myelin
• Meninges- protective covering of brain and
spinal cord. Disease- Meningitis
• CSF- cerebrospinal fluid, clear
• CNS- central nervous system