An organ which has a function which is controlled by another organ.
It pertains to a cluster of tissue situated near an organ that bears resemblance to the organ itself, yet lacks significant purpose, if any. Although not inherently harmful, these organs can pose issues if they enlarge excessively or develop cancerous conditions. Nonetheless, their existence indicates an underlying abnormality within the parent organ.
A secondary structure that aids in the functioning of a primary organ. For instance, the eyelid, eyebrow, and conjunctival membrane serve as accessory organs to the eye.