Neuro Phys Part 1 Flashcards
(91 cards)
CNS includes?
the brain and spinal cord
for CNS, a collections of neuronal cell bodies is called?
nuclei
What are the general functions of CNS
integration, decision making, and processing of signals occurs
the PNS includes?
nerves
for PNS, the collections of neuronal cell bodies is called?
ganglia
what are the general functions of PNS?
signals from CNS travel to/from targets in the periphery
which nerves innervate head and neck muscles directly from the brain?
cranial nerves
which nerves innervate the rest of the body?
spinal nerves
what are the divisions of the autonomic nervous system (ANS)?
sympathetic (fight or flight) and parasympathetic (rest and digest)
what is the function of the sympathetic nervous system?
prepares the body for action - increases heart rate, blood pressure, etc.
what is the function of the parasympathetic nervous system?
conserves energy - slows heart rate, stimulates digestion
How does the sympathetic nervous system communicate?
through spinal nerves only
how does the parasympathetic nervous system communicate?
through both cranial nerves and spinal nerves
what structures are innervated only by the sympathetic system (no parasympathetic)?
cutaneous blood vessels and erector pili muscles
What type of innervation do the heart, smooth muscle, and glands receive?
dual innervation (both sympathetic and parasympathetic)
what is the autonomic innervation for blood vessels?
sympathetic only
what is the autonomic innervation for skin and sweat glands?
sympathetic only
what part of the heart is innervated by both sympathetic and parasympathetic nerves?
nodal tissue (rate control)
what part of the heart is innervated only by the sympathetic nervous system?
cardiac muscle (contractility)
is parasympathetic innervation to the heart strong or limited?
very limited, mainly affects heart rate
What are the two types of ganglia?
paravertebral and prevertebral
for sympathetic NS, pre-ganglionic neurons start from ? to ?
spinal cord to the ganglia
for SNS, the pre-ganglionic cell bodies sits in the ?, and at what levels?
spinal cord
levels T1-L2/3
for SNS, the pre-ganglionic neurons are myelinated or non-myelinated
myelinated