Lymph Drainage

Question 1

Which lymph nodes drain most cutaneous lymph from the umbilicus down, including the external genitalia and anus (below the dentate line); what are the 2 exceptions?

Answer 1

• Superficial inguinal nodes
• Exceptions = glans penis and posterior calf –> which drain into deep inguinal nodes

Question 2

Where does lymph from the superior vs. inferior portion of the bladder drain?

Answer 2

• Superior: drains to external iliac nodes
• Inferior: drains to internal iliac nodes

Question 3

Where does lymph from the upper 1/3 of the rectum drain?

Answer 3

Inferior Mesenteric nodes