nerves and the nervous system part 1
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what does the central nervous system involve
brain spinal cord
What are peripheral nerves
bundles of many individual fibres
What do peripheral nerves contain
afferent fibres efferent fibres
Afferent fibres
to the brain, sensory
efferent fibres
from the brain
what does the Peripheral nervous system contain
motor fibres (somatic nervous system) fibres to the autonomous nervous system
Dorsal
Towards the back
Ventral
Towards the front
Dorsal root
Carries sensory (afferent) info to the CNS
Ventral root
Carries efferent (motor) info to muscles and glands
Grey matter
consists of cell bodies of some interneurons and some efferent neurons
White matter
consists of axons carrying informations through spinal cord to brain
What does the cross section of a spinal cord show
highly organised structures
What do the mixed spinal nerves divide in
a dorsal and ventral root
what is segmented
the spinal cord
what can each segment of the spinal cord be assigned to
A specific part of the body
What is an area controlled by one spinal nerve called
dermatome