abdominal nerves and the perception of abdominal pain Flashcards
where does the enteric nervous system (ENS) supply
from the oesophagus to the anal canal
how many neurons is in the ENS
> 100million
arrangement of the ENS
arranged in ganglionic plexuses
interconnecting bundles of UNMYELINATED fibres
action of the ENS
can perform reflux actions - secretion, absorption, mixing and gut movements without CNS - basal level
CNS modulates actions of the ENS
axons of intrinsic ENS neurons project to sympathetic ganglia, panc, gall bladder, trachea, spinal chord, brainstem
the myenteric plexus
in muscularis - outermost
longitudinal and circular muscle for peristalsis
the submucosal plexus
musclularis of the submucosa
secretory gland and sm
muscle contract and relax - move the wall
which layer of the gut wall is the ENS in
the submucosal layer
purpose of the ANS
involuntary actions
innervate body wall and muscles, abdo and pelvis, head and neck
2 divisions of the ANS
sympathetic and parasympathetic
where does the ANS originate from
CN 3 7 9 10
(ocularmotor, fascial glossopharyngeal, vagus)
S2-4
path of the sympathetic nerves
through the symp chain - the ganglia represent the spinal level
path of the parasymp nerves
CN - supply thorax
sacral - supply abdo
mainly
function of the ANS to the abdo
efferent - motor to sm, secretomotor to glands (PNS)
afferent - symp: pain, PNS: functional sensation eg stretch
where is the coeliac ganglion
around the coeliac axis
what does splanchnic mean
visceral
sympathetic nerves to the abdomen and their vertebral levels
greater splanchnic - T5-9
lesser splanchnic - T10-11
least splanchnic - T12
nerves from L1-2
all from sympathetic chain
autonomic nerve supply to the peripheral vessels and skin
sympathetic only - no PN to body wall
they run with somatic nerves
muscle, sweat glands, erector pili muscles
autonomic nerve supply to the organs
lack somatic innervation
nerves run with the arteries to same organs - mostly
path of sympathetic nerves from the spinal cord
exit grey matter -> symp chain -> post ganglionic branch
how is the ANS supply to the abdo organsised
through plexuses (interconnecting network of nerves) surrounding aorta and branches
symp nerves synapse at ganglia associated with the plexuses
named according to the associated bv
name the abdominal plexuses, trunks and ganglia
superior mesenteric ganglion inferior '' symp trunk and ganglion inferior hypogastric plexus - below rim of the pelvic inlet anterior (L) vagal trunk coeliac trunk and ganglion renal plexus and ganglion superior hypogastric plexus - bifurcation of the abdominal aorta, above rim of the pelvic inlet
describe plexuses
the symp and parasymp nerves come together - not combined but in the same network
which nerves are associated with which artery
coeliac - X T5-9 superior mesenteric X T10-11 renal - X T10-12 testicular/ovarian - X T10-11 inferior mesenteric S2-4 T12-L2 superior and inferior hypogastric plexuses - S2-4 T12-L2
where does the sympathetic chain end
the coccygeal segment
