The occipital sinus has connections with intracranial veins and vertebral vein plexus, thus play a role in accessory venous drainage from the intracranial and in metastatic spread of diseases to intracranium.

• 枕下海绵窦与颅内静脉、椎静脉丛存在交通，在颅内辅助引流静脉及疾病脑转移中起着重要作用。