To solve this problem, we need to analyze the statements regarding juxta medullary nephrons and determine which one is correct. Let's evaluate each option:$\newline \bullet$Option 1: Loop of Henle of juxta medullary nephron runs deep into medulla.$\newline$ - Juxta medullary nephrons have long loops of Henle that extend deep into the renal medulla.$\newline$ - This is a key feature that distinguishes them from cortical nephrons, which have shorter loops.$\newline$ - Therefore, this statement is correct.$\newline \bullet$Option 2: Juxta medullary nephrons outnumber the cortical nephrons.$\newline$ - In the human kidney, cortical nephrons are more numerous than juxta medullary nephrons.$\newline$ - Typically, about 85\% of nephrons are cortical, while only 15\% are juxta medullary.$\newline$ - Therefore, this statement is incorrect.$\newline \bullet$Option 3: Juxta medullary nephrons are located in the columns of Bertini.$\newline$ - The columns of Bertini are extensions of the renal cortex between the renal pyramids.$\newline$ - Juxta medullary nephrons are not specifically located in the columns of Bertini; they are located near the boundary of the cortex and medulla.$\newline$ - Therefore, this statement is incorrect.$\newline \bullet$Option 4: Renal corpuscle of juxta medullary nephron lies in the outer portion of the renal medulla.$\newline$ - The renal corpuscle of juxta medullary nephrons is located at the junction of the cortex and medulla, not in the outer portion of the medulla.$\newline$ - Therefore, this statement is incorrect.$\newline$Based on the analysis, the correct statement is:$\newline$Option 1: Loop of Henle of juxta medullary nephron runs deep into medulla.