the mammalian nervous system Flashcards
what do communication systems in organisms enable
detection of stimuli
cell signalling
rapid and well coordinated response
what is the divisions of the nervous system
CNS and PNS
what is the cns divided into
brain
spinal cord
what is the PNS divided into
sensory system and motor system
what is the motor system divided into
somatic system
autonomic system
what is the autonomic system divided into
parasympathetic system
sympathetic system
what neurone is most abundant in the brain
relay
in the brain, what cell type is more common. Non myelinated cells or myelinated
non myelinated cells therefore it appears grey.
describe the structure of the spinal cord relating to non myelinated neurones and myelinated neurones
the central part of the spinal cord is non myelinated therefore it is grey
the outer part contains a lot of myelinated therefore it is white.
what do myelinated neurones in the spinal cord ensure
carry action potential up and down the spinal cord for rapid, long distance communication
what is the role of the PNS
ensures rapid communication between sensory receptors, cns and effectors.
what neurones compose the pns
sensory and motor.
describe the sensory nervous system
sensory neurones in the spinal cord allow action potentials to be conducted from sensory receptors to the CNS
what is the somatic nervous system
consists of motor neurones that conduct action potentials from the cns to the effectors that are consciously controlled.
how many motor neurone are used in connecting the CNS to the effector in the somatic nervous system
1
