Pns Nerves/ganglia Flashcards
Nerve come down from where
Neurons (cell bodies) in the cns
Nerve
Bundle of many axons in the pns
Nerve description
Grouped together and coated in myelin (like insulation)
Nerves Innervate
Muscle by conducting messages from the cns to muscle fibers, leaving (efferent)
Nerves convey
Sensory input from muscles back to the brain, incoming (afferent)
Types of nerves in the pns
Spinal and cranial
Spinal nerves
Convey motor input to the body
Convey sensory input from the body- both outgoing and incoming fibers
Emerge from brainstem
Cranial nerves
Convey motor input to head, mouth, articulators, and some internal organs
Convey sensory input from head, mouth, articulators, and some internal organs–>some only motor or sensory or both
Merge form brainstem
Spinal nerves emerge from
Spinal cord
Cranial nerves emerge from
Brainstem
In the cns. A bundle if axons coated in myelin is called
A tract
Ganglia description
Collection/group of neurons(nerve cell bodies) outside the cns
Found in the pns (not cns)
Ganglia continued
Which person certain function, outside the cns
Gray mater
Exception is basal ganglia in cns
In te cns a group of neurons is called a
Nuclei
Spinal, cranial nerves and ganglia of the pns have various functions
Serve as a connecting system between cns and body
Engage/provide voluntary and involuntary control over the body
Spinal, cranial, and ganglia uses a two way communication system
Motor-efferent- bruins sending info from cns to body
Sensory (afferent) neurons sending info to the cns from the body
Pns has two major divisions and types of control
Somatic- voluntary
Autonomic - involuntary control
Nerve receive impulse from cns successfully synapse and shoot impulse into
Pns (voluntary and involuntary)
Humans nervous system break down to
Cns( Brain, spinal cord)
Pns(cranial and spinal nerves and ganglia)
Pns breakdown to
Somatic(voluntary)
Autonomic (involuntary)
Somatic breakdown
Control of skeletal muscle
Reflex arc
Autonomic breakdown to
Enteric- digestion
Sympathetic- fight/flight
Parasympathetic- calm/regroup
