Organisation Of The Nervous System Flashcards
What is the nervous system
A system that allows the organism to:
- Sense info about its environment
- Respond rapidly and accordingly
What does the somatic sensory neuron detect
Touch Pain Pressure Vibration Temperature Hearing Equilibrium Vision Smell
What does the visceral sensory neuron detect
Stretch Pain Temperature Chemical changes Nausea Hunger Taste Irritation
What neurons make up the sensory afferent division
Somatic and visceral sensory neurons
What makes up CNS
Cranial and spinal nerves
What does the somatic motor do
Innervates skeletal muscles for movement
What does the visceral motor do
Innervates smooth muscles, cardiac muscle and glands aka autonomic nervous system
What are the 2 ANS divisions
Parasympathetic and sympathetic divisions
What are the 2 principal cell types of nervous system
Neurons (transmit electrical signal) and neuroganglia (support cells)
6 classes of neuroganglia
Astrocytes Microglia Oliodendrocytes schwann cells non ciliated ependymal cells ciliated ependymal cells
what does astrocyte do
form BBB
what does microganglia do
phagocytosis to fight infection
what does oliodendrocytes do
bind CNS neurons together and insulates axons
what do schwann cells do
myelin sheath
what do non-ciliated ependymal cells do
secrete cerebro spinal fluid
what does ciliated ependymal cells do
move cerebro spinal fluid around to keep it homogenous
what is white matter
bundles of axons each coated in mylein sheath
what is gray matter
masses of cell bodies and dendrites each covered with synapses
what does the brain and spinal cord consist of
grey and white matter
what is the reflex arc
- stimulus activates recetor
- activates senosry neuron and transmits signal to CNS
- CNS processes info and transmits signal to motor
- motor sends signal to muscles/glands for response
- response
what do poprioceptive senses do
detect stretch in tendons muscles joints and ligaments
where are visceral senses more common
digestive and urinary tract
reproductive organs
what are the peripheral sensory receptors
exteroceptors
enteroceptors
proprioceptors
what do entercoeptors do
detect stimuli from within i.e internal viscera
