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FA-2016 neuro pg 452
firstaid neuro page 452( based of FA 2016)
Question | Answer |
---|---|
what is syringomyelia? | cystic cavity within the spinal cord (if central canal>> hydromyelia) |
which fibers of spinal cord are damaged in syringomyelia? | anterior spinal commisural fiber |
syringomyelia is associated with what? | Arnold chiari malformation type II |
what is Arnold chiary malformation type I? | >3-5mm cerebellar tonsilar ectopia/ Manifests and headache and cerebellar symptoms |
where does syringomyelia most commonly occur? | C8-T1 |
Clinical feature of syringomyelia? | Cape like - bilateral loss of pain and temperature sensation in upper extremities(fine touch sensation is preserved) |
syringomyelia may cause what syndrome? | horner syndrome (Ptosis, anhydrosis, miosis) |
which embryonic structure forms tongue? | 1st and 2nd branchial arches form anterior 2/3rd of tongue / 3rd and 4th branchial arches form posterior 1/3rd of tongue |
sensation of tongue? | General sensation (9) and taste sensation (9) - post 1/3rd (99) General sensation (5) and taste sensation (7) - anterior 1/3rd (57) |
taste sensation is carried via ? | CN 7(anterior 2/3rd) ,9(posterior 1/3rd) , 10- extremely posterior (solitary nucleus) |
pain sensation in tongue is carried via? | CN V3 - anterior (53), 9 -posterior, 10 - extremely posterior |
motor innervation in tongue? | CN 10, 12 |
muscle of tongue is derived from? | occipital myotomes(somatomeres) |
Motor innervation to tongue specifically? | Motor innervation is via CN 12 to hypoglossus, genioglossus, styloglossus Motor innervation is via CN 10 to palatoglossus |
function of hypoglossus? | retract and depresses the tongue |
function of genioglossus? | protrude the tongue |
function of styloglossus? | draws side of tongue upward to create trough for swalloing |
function of palatoglossus? | elevate posterior tongue during swallowing |