Neurophysiology Flashcards
sympathetic nervous system:
length of pre n post ganglionic fibers
long pre
short post
parasympathetic nervous system:
length of pre n post ganglionic fibers
short pre
long post
neurotransmitters of sympathetic nerouce system
preganglionic release Ach
Post release NA
neurotransmitters of parasympathetic nerouce system
pre release Ach
Post release Ach
where preganglionic cell bodies lie: sympa
lateral grey horn of spinal cord
where preganglionic cell bodies lie: para
brain stem
nicotinic
is ionotropic type
muscarinic
is metabotropic (M&M)
adrenergic
is metabotropic
ADRENAL MEDULLA
➢ Wen stimulated by sympathetic preganglionic neurons, it an produce noradrenaline and adrenaline
lamina I, II, V
nociception
➢ exteroception
sensitivity to stimuli originating outside of the body
➢ proprioception
sense stimuli arising within the body regarding position, motion, and equilibrium.
➢ nociception
transmission of pain (not the feeling of pain)
➢ mechanoreceptors-
respond to stretch or deformation
sensory system
accessory structure TRANSLATE receptors TRANSUDCE afferent nerve fibres TRANSMIT cns
A alpha fibre
proprioceptors of skeletal muscle
A beta fibre
mechanoreceptors of skin
A delta fibre
pain temp
C fibre
pain, temp, itch
o A –delta for pain
mecahnorecptors and thermoreceptors
o C delta for pain
polymodal
modulation of pain
o Amygdala + hypothalamus -> periaqueductal grey (PAG) -> RVM in lower brainstem -> spinal cord -> pain modulated
discriminative sensation pathway
posteior column-medial lemnicus
non discriminative sensation pathway
spinothalamic tract
discriminative sensation
for wat?
fine touch (cutaneous mechano-receptors) proprioception
non discriminative sensation
for wat?
crude touch
thermoception
nocicpetion
➢ meissner’s corpuscles
vibration (superficial)
hair follicles
➢ merkel’s discs
pressure and texture
➢ pacinian corpuscles
vibration (deep
➢ ruffini’s corpuscles
stretch
small RF (receptive field)
fine tactile acuity
larger RF (receptive field)
less tactile acuity
muscle spindles
detect stretch/length of muscle
golgi organs
detect muscle tension
penile erection
parasympathetic
Fine’touch’is’controlled’by:’
a. Mechanically’gated’and’activated’by’stretch’
