7 (C) SNS ANS Flashcards
ANS is influenced by the hypothalamus how (position)
Rostrally
Visceral organs receive both what
CNS / PNS
PNS visceral motor division have what fibres to what structures
Efferent motor fibres to smooth muscle
ANS is only carried via …..
segments
T1 - L2
S2 - S4
What part of the spinal cord does the PNS travel down
Lateral grey horn
Preganglionic neurone is found in what?
CNS
Pastganglionic neurone + autonomic ganglion is found in what?
PNS
SNS flows from what segments
T1 - L2
What type of effect does the SNS have
Widespread
What type of outflow is the PNS
Craniosacral outflow
What CN are involved in the PNS
CN 3
CN 7
CN 9
CN 10
is the organ plexuses post / pre ganglionic
Post
What type of effect is the PNS
Localized
The pelvic splanchnic nerves are ….
segments
S2 - S4
The pelvic splanchnic nerves do what to the bladder / rectum / penis?
Open bladder
Empties rectum
Erections
SNS transmitter pre ganglionic
SNS transmitter post ganglionic
AcH
NE // epinephrine
How does the SNS affect the adrenal medulla
Preganglionic go straight to the adrenal medulla and directly release NE into BS
NO post ganglionic fibres used
the Cardiopulmonary system synapse at what ganglia
what level is this at
Paravertebral ganglia at entry
*first barrier of nuclei
the digestive system synapse at what ganglia
what level is this at
DOES NOT SYNAPSE AT SYMPATHETIC TRUNK
Goes to prevertebral ganglia for synapse // adrenal medulla
(*2nd barrier of nuclei)
how does the fibres for face / gland / eyes travel in the SNS
Ascend / descend to another ganglion in trunk
The White Ramus Communicans have what type of fibres
What levels do they come from?
Myelinated preganglionic SNS fibres
T1 - L2
Grey Ramus Communicans have what type of fibre?
What levels do they come from?
Unmyelinated postganglionic fibres
All levels of cord
Voiding
Drain away // discharge
Heart + respiratory is affected by what levels of the SNS
T2 - T4
What does the SNS have on bronchioles
Bronchodilation
What level of SNS affects micturition (pee)
T11 - L2
What does the SNS have on the bladder
Prevents voiding = No wee
What level of PNS affects the bladder?
What does it do?
S2 - S4
Induces voiding = pee
What nerve is responsible for somatic voluntary contraction of the external urethral sphincter
Pudendal nerve
What nerve is not acquired in infants that is responsible for micturition
Pudendal nerve
What muscle has stretch receptors in the bladder
Detrusor muscle
What level of the SNS affects rectum emptying?
What does it do to the rectum
L1 - L2
Prevents rectum emptying
Somatic voluntary contraction of the rectum is done via what nerve?
Pudendal nerve
as a summary, cerebrum is responsible for the ANS of …
Emotional responses
as a summary, the hypothalamus is responsible for the ANS of ….
Overall control + regulation
as a summary, the brainstem centres is responsible for the ANS of …
Cardiovascular + respiratory + swallowing
as a summary, the spinal cord centres is responsible for the ANS of …
Urination / defecation / erection / ejaculation
What structure connects the hypothalmus / mamilliary bodies –> hippocampus
Fornix
Function of the mamilliary bodies
Recollective memory
What are major components of the basal nuclei / ganglia (3)
What are the other 2 components
Caudate Nucleus // Putamen // Globus Pallidus
Substantia Nigra // Subthalamic Nucleus
Major commisure of the brain
Corpus Callosum
Which component of the ventricular system is found a the diencephalon?
3rd ventricle
Which component of the ventricular system is found a the Midbrain
Cerebral Aquaduct
Which component of the ventricular system is found a the Pons
4th ventricle
At which points do the ventricular system communicate with the subarachnoid space? (2 foramen)
foramen of Magendie // foramina of Luschka
Foramina of Monro connects what
Lateral ventricles -> 3rd ventricle
*Interventricular foramina
Foramina of Luschka connect what?
4th ventricle to subarachnoid space
Cerebral aquaduct connect what?
3rd to 4th ventricle
