涙腺

1. Origins, structure, and basic meaning

• Structure: 涙腺 (るいせん) is the anatomical noun tear gland.
• Basic usage: 涙腺が示される identifies the organ in a model; 涙腺を刺激した figuratively says an ending brought tears.

2. Common pitfalls and similar expressions

• Anatomical gland and emotional response
  • The first is literal anatomy, while を刺激する in the second expresses an emotional trigger for tears.