nervous system Flashcards
3 general functions of nervous system
- motor (efferent) functioning
- sensory (afferent) functioning
- integrative (associative) functioning
motor functioning
- aka
- two functions
- efferent functioning
- controls muscle contractions and gland secretions
sensory functioning
- aka
- function
- afferent functioning
- detection of body’s internal/external environment
integrative functioning
- aka
- five functions
- associative functioning
- memory, emotion, interpretation of senses, logic, creativity
central nervous system consists of what 2 things
- brain
- spinal cord
peripheral nervous system consists of what 3 things
- nerves
- sensory receptors
- sensory organs
peripheral nervous system: motor
2 divisions
- somatic nervous system
- autonomic nervous system
somatic nervous system
- what wired to what
- controls what
- nerves wired to skeletal muscles (motor units)
- controls voluntary skeletal muscle contractions
autonomic nervous system
- what wired to what 3 things
- controls what 3 things
- nerves wired to smooth muscle, cardiac muscle and glands
- controls involuntary smooth muscle and cardiac contractions, controls gland secretions
peripheral nervous system: sensory
- what wired to what 2 things
- relay what to what
- nerves wired to sensory receptors and sensory organs
- relay sensory impulses to central nervous system
2 main nervous system cell types
- glial cells
- neurons
glial cells
- aka
- what are they
- neuroglia
- supporting cells that surround and maintain the environment around neurons
6 types of glial cells
- astrocytes
- microglia
- ependymal cells
- oligodendrocytes
- satellite cells
- schwann cells
astrocytes
- most what
- location
- shape
- function one
- function two
- most abundant type of nervous system cell
- found in brain and spinal cord
- star shaped
- hold neurons in place
- have extensions that wrap around capillaries of brain and spinal cord to help regulate which chemicals can cross from blood to brain and spinal cord
microglia
immune cells in the brain and spinal cord
ependymal cells
- location
- function
- line the walls of the brain’s ventricles
- continuously filter blood and produce new cerebrospinal fluid
oligodendrocytes
- location
- function
- found in brain and spinal cord
- wrap around the axons of neurons forming a myelin sheath
myelin sheath function
insulate and speed up conduction of electricity down the length of an axon
satellite cells
- just like what other cells
- location
- like astrocytes
- found in peripheral nervous system
schwann cells
- just like what other cells
- location
- added function
- like oligodendrocytes
- found in peripheral nervous system
- involved in repairing axons
neurons are what
cells that generate and conduct electricity
9 structures of a neuron
- nucleus
- cell body
- dendrites
- axon hillock
- axon
- axon terminal
- synapse
- post synoptic cell
- nodes of ranvier
dendrites function
receive signals that either activate or inhibit neuron
axon function
conducts electricity down its length
axon terminal function
stores and when electricity enters it, releases neurotransmitters in vesicles