Autonomic NS Flashcards
What forms the ventral part of the diencephalon?
The hypothalamus
What is most important function of hypothalamus?
Links nervus system to endocrine system via pituitary gland
What do neuorhormones of hypothalamus do?
Stimulate or inhibit secretion of pituitary hormones
How many peripheral pathways is the autonomic system associated with?
4- 2 motor, 1 sensory and 1 mixed
What do motor (efferent) pathways consist of?
Parasympathetic and sympathetic systems
How many neurons do the efferent pathways have between cord/brainstem and end-organ?
2- the preganglionic fibre (1st) and the postganglionic fibre (2nd)
What is the terminal neurotransmitter in sympathetic pathway?
Noradrenaline
Where does the sympathetic pathway originate?
The posterior hypothalamic area
Where do the fibres of the sympathetic pathway descend?
In the central autonomic pathways
Where do the sympathetic fibres end?
The lateral horns of grey matter from T1-L2
How do second order neurons pass from lateral horns to sympathetic chain?
emerge from anterior nerve roots and pass via white rami communicates
What is parasympathetic outflow from CNS?
Craniosacral only
What is the neurotansmitter for the parasympathetic system?
ACh
Where do parasympathetic fibres originate?
The anterior hypothalamic area
Which 4 cranial nerves are the cranial preganglionic fibres found in?
CN III (ooculomotor), CN VII (facial), CN IX (glossopharyngeal), CN X (vagus)
