Neurology Anatomy and Physiology Flashcards
Serves as the control center for the entire body
Central Nervous system
Integrate incoming info and determine appropriate response (2)
Brain and spinal cord
Peripheral Nervous System
cranial nerves (12 pairs, link to brain) + spinal nerves (31 pairs, link to spinal cord)
PNS + CNS
Peripheral Nervous System + Central Nervous System
3 types of Nerve Fibers
Sensory, Motor, and Sensory+Motor(mixed)
Receive impulses from sense organs, and transmit to CNS
Sensory nerve fibers
Conduct impulses away from CNS, traveling to muscles and causing to contract/glands to secrete
Motor nerve fibers
Nerve that conducts towards CNS
afferent nerve
Nerve that conducts away from CNS
efferent nerve
12 pairs of cranial nerves
olfactory, optic, oculomotor, trochlear, trigeminal, abducens, facial, vestibulocochlear, glossopharyngeal, vagus, spinal accessory, hypoglossal
Sensory pair of cranial nerves for smell
olfactory
sensory pair of cranial nerves for vision
optic
motor cranial nerves for movement of eyeball/eyelid, pupil size, lens
oculomotor
cranial nerves for sensations of head and face, chewing
trigeminal (Opthalmic - eyes forehead, Maxillary - upper teeth, palate, upper lip, Mandibular - lower teeth, skin of jaw)
motor cranial nerves for eye movement
abducens
mixed cranial nerves for taste, facial expression, saliva/tears
facial
sensory cranial nerves for hearing/equilibrium
vestibulocochlear - vestibular branch (equilibrium), cochlear branch (hearing)
mixed cranial nerves for taste, swallowing, saliva secretion, ear pain/temperature, tongue movement
glossopharyngeal
mixed cranial nerves for sensation from larynx, trachea, heard, abdo/tx organs
vagus
motor cranial nerves for movement of shoulders/head/neck/back , condition of neck+shoulder muscles
spinal accessory
motor cranial nerves for tongue movement
hypoglossal
anterior root (spinal nerves)
motor fibers
posterior root (spinal nerves)
sensory fibers
network of fibers from spinal nerves
plexus
4 main plexuses of spinal nerves
cervical, brachial, lumbar, sacral
spinal nerves - skin over back of head - c1
lesser occipital
spinal nerves - skin over lower part of ear, anterior to ear- C2
greater auricular (cervical plexus)
spinal nerves - skin over ventral part of neck - C3
transverse cervical
spinal nerves - skin of shoulder and upper chest - C4
supraclavicular
spinal nerves - muscles of neck and shoulders - c4
ansa cervicalis
spinal nerves - diaphragm - c4
phrenic
spinal nerves - shoulder, arm - c4
axillary
spinal nerves - arm- c5
musculocutaneous
spinal nerve - c6 - forearm
median
spinal nerve - forearm - c7
ular (brachial plexus)
spinal nerve - arm/forearm/hand - c8
radial
spinal nerve - intercostal and abdominal muscles - T2-T12
intercostal nerves
spinal nerve - skin/muscles of abdominal wall, buttock skin - L1
iliohypogastric
spinal nerve - skin of thigh, base of penus and scrotum - L4
genitofemoral
spinal nerve - skin of muscles and thigh, L4, x2
femoral and obturator
spinal nerve - skin and muscles of leg and foot -S1
sciatic (sacral plexus)
spinal nerve - perineal region, S3
pudendal
primarily supplies skeletal muscles with nerves (voluntary movements)
somatic (SNS)
sends impulses to glands, cardiac, smooth muscles (involuntary movements)
autonomic (ANS)
system that produces increased heart rate, vasoconstriction, increased BP in stressful times
sympathetic system (fight or flight)
system that produces decreased heart rate, vasodilation, decreased BP in periods of calm
parasympathetic system (rest and relaxation)
3 structures of neuro cells
dendrites (cytoplasmic projections, receive impulses), cell body and nucleus (accept and interpret impulse), axon (transmits from cell body)
cells that protect and support neurons
glial cells
cells responsible for impulse conduction
neuro cells
white lipoid covering on axons in PNS
myelin sheath
purpose of myelin sheath
avoid impulse stimulating an adjacent nerve, accelerates transmission through axon
grey matter
unmyelinated fibers
glial cell that wraps around axon in PNS
schwann cell
space between axon of one nerve and dendrite of another
synapse
neuron that ends with a synapse
presynaptic neuron
neuron that begins with a synapse
postsynaptic neuron
cells that help ward off infection, dont transmit but do reproduce
neuroglia
4 ttypes of neuroglial cells
astrocytes (star shaped, prrevent molecules from entering brain capillaries); oligodendrocytes (develop myelin), microgial cells (phagocytic), ependymal cells (ciliated cells in fluid-filled CNS cavities, circulate cerebrospinal fluid)
large bundle of axons wrapped in connective tissue
nerve
cell bodies grouped together in mass, attached to axon
ganglion
5 steps of neural response
reception, transmission, integration, transmission, actual response
stimulus results in predictable automatic response
reflex action
protective response
withdrawal reflex
neuron not conducting an impuse
resting potential
initiated with sodium ions, allowing neuron to depolarize axon
action potential