L04: Basic Anatomy Of The Somatic Nervous System Flashcards
Is the somatic nervous system voluntary or involuntary
Voluntary
What is the anatomical classification of the nervous system
Central nervous system
Peripheral nervous system
What is the central nervous system composed of
Brain
Spinal cord
What is the peripheral nervous system composed of
Axons of the cranial nerve Axons of the spinal nerve Ganglia Nerve plexuses Enteric nervous system
What is the peripheral nervous sytem
The nervous system outside of the CNS
What does the peripheral nervous system do
Connect the CNS to its target organs and tissues
Connects sensory organs back to the CNS
What are the main features of a neurone
Cell body Axon hillock Myelin sheath Node of ranvier Internodal membrane Axon
What are the divisions of the somatic nervous system
Afferents
Efferents
What do afferents do
Carry sensory information from the surface of the body to the sensory brain
What do efferents do
Convey commands from the brain to the muscles
What type of muscle does the somatic nervous system only involve
Skeletal muscle
What is a motoneurone
It is a somatic efferent that supplies the skeletal muscle
What happens to skeletal muscle when is is activated
Brings movement in limbs
Sets muscle tone
What are the categorised of muscle
Striated
Non-striated
What type of muscle does striated muscle involve
Skeletal muscle
Cardiac muscle
