04 - Anatomy Of The Nervous System Flashcards
What is a neuron?
cell of the nervous system specialised to generate and transmit electrical signals
What is a nerve?
A bundle of axons in the peripheral nervous system
What is ganglia?
A collection of neural cell bodies outside the CNS
What is the PNS sub-divided into?
The motor and sensory divisions
The motor division is then divided into what?
The somatic and autonomic divisions
What is the autonomic division divided into?
The sympathetic and parasympathetic divisions
What is the peripheral nervous system made of?
Ganglia
How many pairs of cranial nerves in the PNS
12
How many pairs of spinal nerves in the PNS
31
What does ‘motor’ mean?
Information from the brain to muscle
-> contracted or relaxed = movement
What is the simplest form of motor action of the PNS?
The reflex arc, it doesn’t reach the brain before the motor response is triggered
What is a dermatome?
An area of the skin innervated by the cutaneous branches of a single spinal nerve
What is intergration?
The correct connection between the sensory neuron carrying the message from the receptor to the CNS and the motor neuron carrying the message to the effector is the work of the inter-neurons of the CNS.
What types of movement does the somatic nervous system control?
Voluntary and reflex arc responses
What does the autonomic nervous system innervate?
cardiac and smooth muscle and glands
