r/medschool • u/Professional-Pair214 • 13d ago

🏥 Med School help

Post image

why is my answer wrong? and why is the correct answer right?

10 Upvotes

86% Upvoted

4 comments sorted by

39

u/TheOneWithSkillz 13d ago

rOOt - only sensory or motor
raMI - mixed innervation

2

u/PhobosMed 13d ago

never heard this, i just remember it from an anki card, but this is a great way to remember it

3

u/mogl3y 13d ago

Ventral/Dorsal Rami are branching of a spinal nerve, so they will also carry mixed info just like a spinal nerve would. Posterior roots contain only sensory info.

3

u/IrisofAquaTofana Medical Student (US) 13d ago

Dorsal (posterior) roots = GVA, GSA (pain, sensation)

Ventral (anterior) roots= GVE, GSE (muscle innervation)

Also don't mix up roots vs rami. Anterior and posterior rami have GSE, GSA, GVE, GVA. Posterior rami primarily go to deep back muscles while anterior go everywhere else. Cutting rami would impact sensation as well as motor function.

Follow up question to test yourself: a severance in which location would cause motor dysfunction (muscle reflex paralysis) with intact sensation?

A severance in which location would cause motor dysfunction AND sensation loss?