Nervous System Flashcards
(19 cards)
Nervous system is the bodies primary means of maintaining
Homeostasis
Simple pathway of ns
Sensory input to integration to motor output
Major brain relay center is the
Thalamus
CNS
Brain and spinal cord
PNS
Cranial nerves and spinal nerves
Made up of afférent(sensory) and efferent (motor) neurons
Functions of neuron
Excitability
Conductivity
Why are neurons the most specialized or most advanced of all human cells.
Longevity
Not mitosis
High metabolic rate
What does the term neuroglia mean
Nerve glue
What are gliomas
Growth or growing of glial cells cos they are the only one with mitotic activity
Glial cells in CNS
Astrocytes
Ependymal cells
Oligodendrocytes
Microglia
Glial cells in PNS
Satellite cell
Schwann cell
Functions of astrocytes
Protection
Star shaped and wrapped around capillaries in blood brain barrier
Prevent entry of randoms from these capillaries
Functions of ependymal cell, found where
In ventricles: create current for CSF to move to spinal cord
In Central canal : look like epithelium
Functions of oligodendrocytes
Form myelin sheath in CNS
Unlike Schwann cell, it can myelinate multiple axons
Function of microglia
Neuronal macrophage
Phagocytosis
Where does multiple sclerosis affect
It affects the myelin sheath around axons in both brain and spinal cord.
Causes of multiple sclerosis
Autoimmune disorder
Genetic
Environmental
Gender
What does multiple sclerosis do
Cause plaque and interference of electrical signals
How to test for multiple sclerosis
Test for antibodies in cerebrospinal fluid
Use MRI
