Which lymphatic nodes are primarily responsible for the drainage of the bladder?

The external iliac nodes are primarily responsible for the lymphatic drainage of the bladder. The bladder's lymphatic vessels primarily drain into these nodes, which are located along the external iliac arteries. This drainage system is part of the broader network that facilitates the removal of lymphatic fluid from the pelvic organs.

The cervical nodes are associated with drainage from the head and neck, while the subclavian nodes are linked to upper limb and thoracic drainage. Inguinal nodes are involved mainly in the drainage of the lower abdomen and external genitalia rather than the pelvic organs. Hence, the external iliac nodes are the most relevant in the context of bladder lymphatic drainage.