Nervous system Flashcards
What are the functions of the nervous system?
1- Receive and process information from the environment
2- Coordinate and carry out an appropriate action to respond to those stimuli
What is part of the central nervous system?
The brain and the spinal cord
What is part of the peripheral nervous system?
All nerves outside of the CNS ( brain & spinal chord)
Define the Somatic Nervous System
It is one of the two divisions of the peripheral nervous system (other one is visceral aka automatic)
The stimuli is largely external (touch, vibration, external forces due to gravity, etc)
The response is voluntary ( have control over the skeletal muscles)
What is the basic units of the nervous system?
Neurons
What are the two neutron types?
Multipolar (motor/efferent)
‘Pseudo-Unipolar’ (sensory/afferent)
What is the spinal nerve ?
A bundle of sensory and motor neurons that emerge from the spinal cord (CNS) at regulate intervals to modulate sensory and motor information from the body periphery
What is a nerve?
A bundle of sensory and motor axons
What is the Posterior root ganglion and what does it contain?
It is a group of cell bodies for the sensory neurons
it contains the sensory neutron cell bodies for that spinal nerve
What is the Ventral horn and what does it contain?
It is a group of cell bodies for the sensory neurons
It contains the motor neurone cell bodies for that spinal nerve
Where do the Posterior and Anterior ramus go?
Posterior ramus: go to the Intrinsic back muscles and associated skin
Anterior ramus: To everything else
What is a Dermatome?
Area/region of skin innervated by a single spinal nerve
What is a myotome?
A group of muscles innervated by a single spinal nerve
