Visceral Affarent Paths - S Flashcards
What types of fibers are utilized in the visceral-somatic reflex pathway? What are sx of this reflex arc?
Alpha (muscle fibers) and gamma (intrafusal fibers) motor neurons
Muscle spasms or increased muscle tone (hypertonia)
Where do the primary neurons of the Visceral Affarent Pathways ascend in after entering the SC?
Fasciculus proprius
What are visceral R’s and where are they located, and what do they detect?
Bare n endings located in walls of blood vessels and viscera
Detect stretch and ischemia
What does a prefrontal lobotomy treat? What are the associated symptoms?
Eliminates the affective component of pain, though pain can still be discriminated/sensed, the pt does not care that they are in pain
Apathy, occasional euphoria, irritability, socially inappropriate behaviors
What is referred pain? What are some examples of it?
Visceral pain being projected by the brain as somatic pain instead (triggering a visceral-somatic reflex)
myocardial ischemia referred to the left axillary region
Gall bladder pain referred to area beneath shoulder blade
Ureter distention d/t a kidney stone referred to the loin and groin regions
What is the phantom limb phenomenon? What are associated sx?
Post amputation sx where the distorted perception of the limb still exists via a cortex that’s conditioned to remember something is there
Pain, aches, thermal sensations
GVA fibers in the cranial region terminate where? What CNs are associated with this?
Nucleus tractus solitarius
CN: 7, 9, 10
What is the significance of the secondary connection/NTS-dorsal motor nucleus (X) pathway?
When this pathway is compromised, GERD (gastro-esophageal reflux disease) can occur
GVA pathways in the cranial region, for this section’s purpose.. What the CN 7, 9, and 10 innervate?
7: soft palate
9: poster 1/3 of tongue, oropharynx
10: larynx, pharynx, thoracic and abdominal viscera
What muscle is under parasympathetic control in the visceral (GVA) bladder reflex by S2-4?
Detrusor muscle
What is atonic bladder? What does it result in?
D/t lesions of dorsal roots (affarents) of S2-4 or dorsal funiculi
flaccid bladder and increased bladder capacity, voluntary voiding possible but incomplete
What is reflex bladder? What does it cause?
Transection of SC above S2 interrupts the lateral reticulospinal tracts (LRST) to SAN (sacral autonomic nucleus)
inability to voluntarily void (urinary retention), reflex may return after spinal shock but remember.. WITHOUT voluntary control
Draw out the carotid body reflex.
See notes
Draw out the carotid sinus reflex.
See notes
Draw out the gag reflex.
See notes
