Nerves Flashcards
sensory nerves
I - olfactory
II - optic
VIII - vestibulochlear
motor nerves
III - occulomotor
IV - trochlear
VI - abducens
XI - accessory
XII - hypoglossal
mixed nerves
V - trigeminal
VII - facial
IX . glossopharyngeal
X - vagus
ANS control
spinal cord, medulla oblongata + midbrain, ganglia, hypothalamus
two parts of ANS
- sympathetic nervous system
- parasympathetic nervous system
neurotransmitters in ANS
- acetylcholine
- norepinephrine
ANS neurotransmitter for parasympathetic
- acetylcholine
but causes sweatint which is sympathetic a
ANS neurotransmitter for sympathetic
- norepinephrine
what ANS system is the vagus nerve in
parasympathetic
hypothalamus function in ANS
integrator for autonomic functions
Does the ANS have 1 or 2 cells?
2 cells!
1 in spinal cord or brain
the other in automatic ganglion
sympathetic nervous system ganglia location
just outside spinal cord
parasympathetic nervous system ganglia location
near organs they connect with
adrenal medulla function
direct impulse from preganglionic nerve to secrete adrenaline
cortex influence on ANS
- psychic (blushing)
- bladder control unless it’s full
how many spinal nerves
31
how many cervical spinal nerves
8
how many thoracic spinal nerves
12
how many lumbar spinal nerves
5
how many sacral spinal nerves
5
how many coccygeal spinal nerves
1
reflex arc
neuronal pathway that controls reflexed so info doesn’t have to go all the way up to the brain
somatic reflex
stages
- somatic receptors on skin, muscles tendons
- afferent nerves send impulses from receptor up to posterior horn of spinal cord
- integrating center =
- efferent nerve fibres carry motor nerve signals from anterior horn to muscles
- effector muscle carries out response
monosynaptic reflex
one sensory neuron + one motor neuron
polysynaptic reflex
interneurons connect afferent + efferent cells
encephalisation quotient
potential measure of cog skill diff in animals
trigeminal nerve (V)
sensation in face + chewing (mixed nerve)
