Question: what are the two differences between cortical and juxtamedullary nephrons?
Answer: Cortical nephrons have a short loop of Henle, which penetrates only the outer renal medulla. Juxtamedullary nephrons have a long loop of Henle extending deep into the renal medulla. ... Cortical nephrons occur in all vertebrates, while the juxtamedullary nephrons occur only in birds and mammals.