Week 1- ANS Flashcards
What type of nerve modality is NOT carried to the skin?
Parasympathetics.
What in the skin do sympathetics supply?
They supply the sweat glands, sympathetic tone to the blood vessels and arrector papillae muscle.
What level do sympathetics exit the spinal/ cord? What area of the spinal cord do their cell bodies lie?
Exit from T1-L2.
Cell bodies lie in the lateral horns.
What does the dorsal ramus supply and with what nerve modalities?
Dorsal ramus supplies the posterior body wall with sympathetics, somatic motor and somatic sensory fibres.
What does the anterior/ventral ramus supply and with what nerve modalities?
Ventral ramus supplies the anterior and lateral body wall with sympathetics, somatic motor and somatic sensory fibres.
Sensory fibres go through which root to reach the spinal cord?
Go through the dorsal root.
Motor fibres go through which root to leave the spinal cord?
Go through the ventral (anterior) root.
Describe the role of somatic nerves?
They supply muscles under conscious control (skeletal muscle via somatic motor). They also supply the body wall. Also somatic sensory.
What does the autonomic nervous system supply (generally)?
Viscera, glands
Smooth muscle and influences cardiac muscle
What is the outflow of parasympathetic fibres described as?
Craniosacral.
Which cranial nerves carry parasympathetic fibres?
10, 9, 7 and 3.
Which ganglion does the oculomotor nerve parasympathetics go to?
Oculomotor nerve.
Which muscle in the eye do the parasympathetics supply?
Sphincter pupillae.
(way to remember. Sympathetic is fight or flight. So when you are scared your eyes go wide- therefore dilator papillae. Parasympathetics are the opposite)
Which ganglion does the facial nerve communicate with?
Geniculate ganglion
Pterygopalatine ganglion.
What does the facial nerve supply?
Secretomotor to the submandibular and sublingual glands (via geniculate ganglion).
Secretomotor to the lacrimal gland (via pterygopalatine ganglion)
Which ganglion does the glossopharyngeal nerve communicate with?
Otic ganglion.
What does the glossopharyngeal nerve supply?
Secretomotor to the parotid gland.
Which ganglion does the vagus nerve communicate with?
Forms plexuses on organ surfaces so no ganglions (acc one called jugular ganglion but its not relevant here).
What does the vagus nerve supply?
Visceral motor fibres to heart, lungs and abdominal viscera.
Also visceral sensory.
Where is the sacral outflow of parasympathetic fibres?
S2, S3, S4
What are the nerves called which carry the parasympathetic fibres from sacral outflow?
Pelvic splanchnic nerves.
Generally, what do the parasympathetic fibres supply?
They supply visceral sensory and visceral motor.
Which nerves are mostly responsible for the parasympathetics visceral sensory supply?
CN X and IX.
Where does the sympathetic chain end?
Ganglion impar.
