👁️
1. Brain & Body
Created @January 14, 2022 7:50 AM
Reviewed
The Nervous System
Central
brain + spinal cord
Peripheral
connects CNS with the rest of the body
outside of the brain + spinal cord
a. Autonomic NS: unconscious involuntary movements + regulates body’s
internal environment eg. heartbeat
b. Somatic NS: voluntary motor skills + interacts with the external environment
eg. raising your hand when you have a question
Autonomic NS
Sympathetic
1. Brain & Body 1
, arousing - stimulates, mobilizes energy
“fight-or-flight”
Parasympathetic
relaxation - conserves energy
“rest-and-digest”
💡 Efferent neurons ➡️ sympathetic & parasympathetic
Afferent neuron
carries info from sensory organs like ears, eyes, nose to the brain
A = admit info
sensory + incoming nerves
Efferent neuron
E = exit info
carries info from brain to muscles
motor + outgoing nerves
1. Brain & Body 2
, 💡 Both somatic + autonomic NS have efferent & afferent neurons
Brain cells
Neuron
nerve cells that transmit messages from one part of the body to another
nucleus contains DNA
myelin sheath isolates the axon + gives white color
presynaptic terminals (buttons): here the signal is passed to the dendrites of
other neurons or other cells
1. Brain & Body 3
, Types of neurons
motor ➡️ efferent
sensory ➡️ afferent
interneurons ➡️ connects one neuron to another, there is no or short axons
and no myelin sheaths
Classification of neurons
unipolar: one extension
bipolar: 2 extensions
multipolar: 2 or more extensions
Glial cells
work to support neurons
surround neurons
Brain
forebrain
telencephalon (endbrain)
diencephalon (interbrain)
1. Brain & Body 4
1. Brain & Body
Created @January 14, 2022 7:50 AM
Reviewed
The Nervous System
Central
brain + spinal cord
Peripheral
connects CNS with the rest of the body
outside of the brain + spinal cord
a. Autonomic NS: unconscious involuntary movements + regulates body’s
internal environment eg. heartbeat
b. Somatic NS: voluntary motor skills + interacts with the external environment
eg. raising your hand when you have a question
Autonomic NS
Sympathetic
1. Brain & Body 1
, arousing - stimulates, mobilizes energy
“fight-or-flight”
Parasympathetic
relaxation - conserves energy
“rest-and-digest”
💡 Efferent neurons ➡️ sympathetic & parasympathetic
Afferent neuron
carries info from sensory organs like ears, eyes, nose to the brain
A = admit info
sensory + incoming nerves
Efferent neuron
E = exit info
carries info from brain to muscles
motor + outgoing nerves
1. Brain & Body 2
, 💡 Both somatic + autonomic NS have efferent & afferent neurons
Brain cells
Neuron
nerve cells that transmit messages from one part of the body to another
nucleus contains DNA
myelin sheath isolates the axon + gives white color
presynaptic terminals (buttons): here the signal is passed to the dendrites of
other neurons or other cells
1. Brain & Body 3
, Types of neurons
motor ➡️ efferent
sensory ➡️ afferent
interneurons ➡️ connects one neuron to another, there is no or short axons
and no myelin sheaths
Classification of neurons
unipolar: one extension
bipolar: 2 extensions
multipolar: 2 or more extensions
Glial cells
work to support neurons
surround neurons
Brain
forebrain
telencephalon (endbrain)
diencephalon (interbrain)
1. Brain & Body 4
