PNS Flashcards
PNS
Peripheral nervous system
classification of nerves
sensory –> afferent (imput)
Motor –> efferent (output)
most nerves are mixed
these nerves stem from the brain or spinal cord
Plexus (4 types)
Cervical plexus –> phrenic nerve
Brachial plexus –> radius, median, ulna, musculanteous nerves
lumbar plexus –> femoral nerve (front)
Sacral plexus –> sciatic nerve (back)
Cranial nerves 1
olfactory, smell
cranial nerve 2
optic, vision/sight
cranial nerve 3
ocular-motor, eye movement
cranial nerve 4
trochlear, eye movement
cranial nerve 5
trigeminal, sensory + motor in face
cranial nerve 6
abducens, eye movement
cranial nerve 7
facial, face expression
cranial nerve 8
vestibularcochler, hearing + balance
cranial nerve 9
glossophalangeal, swallowing
cranial nerve 10
vagus, digestion, heart rate
cranial nerve 11
accessory, head + neck movement
cranial nerve 12
hypoglossal, tonuge + taste
sensory receptors
feeling through the body
exteroreceptor
skin and external stimuli
interoreceptor
visoro (organ)
machanoreceptor
muscles
thermoreceptor
temperature
photoreceptor
light + color (light is rodes) (color is cone)
chemoreceptor
chemical receptor, taste buds on tongue
proprioceptors
skeletal muscle receptor
nociceptor
pain receptor
neurotransmitters
chemical receptor that carries signals
acetylcholine (ach)
released at nmj and some ans neurons
organ –> all muscles
dopamine
Feeling of happiness, pleasure, reward (partkinsons lacks dopamine)
GABA gamma-aminobutracid
slows down activity brain activity, calming, controls hunger (tells you when your full)
serotonin
regulates mood, sleep, appetite, learning, memory
endorphin
body’s natural pain reliever, reduces pain perception and improves mood
norepinephrine
fight or flight signals
