Baroreceptor Afferent Pathways Flashcards
high pressure baroreceptors: Carotid afferents via ???
CN IX
High pressure baroreceptor aortic afferents via ???
CN X
low pressure baroreceptor afferents via
CN X
both low and high pressure afferent baroreceptor pathways target the ??? which is the medullary cardiovascular centre
medulla oblongata
TRUE or FALSE: LPB can activate hypothalamus as it inhibits anti-diuretic hormone when atrial stretch afferents to medulla via CN X
TRUE
Baroreceptors in carotid sinus, aortic arch, LPBR are afferent signalling via ??? and ??? to medulla: nucleus of the solitary tract (NTS)
CN IX and CN X
the nucleus of the Solitary Tract (nucleus tractus solitarius) is an afferent or efferent sensory integrator?
afferent
thoracic spinal cord conveys sympathetic innervation to the ??? AND arterioles/venules (constriction)
heart
most vascular beds in the body exhibit SNS constrictor tone. Unless they are inhibited, vasomotor area= vasoconstriction or vasodilation?
vasoconstriction
if passive vasodilation needed (depressor effect), inhibitory neurons from the NTS block the ??? area / SNS constrictor tone
vasomotor area
an increased MAP = increased HPBR afferent firing = NTS inhibitory neuron firing = vasomotor area ??? = decreased constrictor tone = passive vasodilation = decreased MAP
inhibition
the cardio-inhibitory area, if needing cardiac deceleration: excitatory neurons from NTS project to CIA comprised of dorsal motor nucleus of vagus nerve and the nucleus ???
nucleus ambiguos
TRUE or FALSE: if need cardia deceleration (cardia-inhibitory area), vagal innervation to the heart occurs whereby axons = parasympathetic pre-ganglionic neurons from vagus nerve.
TRUE
the main component of baroreceptor reflex (bradycardia) is the ??? from medullae (central integrator)
cardio-inhibitory area
passive vasodilation in cardio-inhibitory area of medula is from the ??? inhibitory neurons which inhibit the ??? area
NTS inhibitory neurons
inhibits vasomotor area
