Endocrine System

The lacrimal sac and its associated drainage system form an intricate network essential for tear flow and ocular surface health. This complex system, beginning at the puncta and ending at the nasal cavity, demonstrates precise anatomical organization that ophthalmologists and surgeons must understand for diagnosing and treating various lacrimal disorders. The proper functioning of this system is crucial for maintaining eye health and preventing infection.

The thyroid gland represents a vital endocrine organ that plays a crucial role in regulating metabolism, growth, and development throughout the human body. This anterior view illustration demonstrates the butterfly-shaped thyroid gland's anatomical relationship with surrounding structures in the neck, including its intimate association with the larynx and trachea, which are essential considerations in both medical diagnosis and surgical intervention.