The word canthus refers to either corner of the eye where the upper and lower eyelids meet. These junctions are crucial anatomical landmarks of the human eye.
Understanding the Canthus
The canthus serves as a vital point of convergence for the ocular structures. Each eye possesses two canthi:
- Medial Canthus: This is the inner corner of the eye, closer to the nose. It contains the lacrimal caruncle, a small, pink, fleshy nodule, and the plica semilunaris (semilunar fold of the conjunctiva), a small fold of conjunctiva.
- Lateral Canthus: This is the outer corner of the eye, farther from the nose, where the eyelids meet towards the temple.
These corners play a role in the proper functioning of the eyelids and the drainage of tears.
Terminology and Plural Form
The term "canthus" has a specific plural form and an alternative anatomical name. Understanding these terms is essential for clear communication, particularly in medical contexts.
| Term | Description |
|---|---|
| Canthus | The singular form, referring to a single corner of the eye (e.g., the medial canthus or lateral canthus). |
| Canthi | The plural form, referring to both corners of the eye collectively. |
| Palpebral Commissure | An alternative, more formal anatomical term for the canthus, emphasizing the meeting point of the eyelids. |
Significance in Eye Health
The canthi are important in various aspects of eye health and clinical examination. For instance:
- They are key reference points for surgical procedures around the eye.
- Their integrity is vital for the proper closure of the eyelids and protection of the eyeball.
- Conditions affecting the canthi can impact tear drainage, leading to dry eyes or excessive tearing.
For more detailed anatomical information, one can consult reputable medical and anatomical resources like this overview of eye anatomy.
