How nerves work 1-5 Flashcards
Nervous system (2 areas)
CNS and PNS
CNS
Brain and spinal cord encased in bone
PNS
Somatic and autonomic
Autonomic
Sympathetic and parasympathetic
Meninges
3 membranes that envelop brain and spinal cord and protect the spinal cord
Gyrus
Ridge on cerebral cortex - high
Sulcus
Ridge on cerebral cortex - low
Where is the cerebellum?
Back of the brain for balance
4 cerebral cortexes
Frontal, parietal, temporal and occipital
Diencephalon
In forebrain below cerebrum
Thalmus and hypothalamus
Thalmus
Last relay of information from spinal cord q
Hypothalmus
Hormones and endocrine gland
3 parts of brainstem
Pons, midbrain and medulla
How many spinal nerves are there?
31
Name how many nerves there are at each vertebrate level
7 cervical 12 thoracic 5 lumbar 5 sacral 1 coccygeal
Axon hillock/initial segment
Make action potential
Axon terminal
Release neurotransmitter
Astrocytes
Maintain external environment and make blood brain barrier and surround blood vessels
Oligodendrocytes
Wrap feet around axon to form myelin sheath in CNS
Microglia
Little cells in immune system and mop up infection
What is the function of the resting membrane potential?
Keep cell ready to respond