## **Core Concept**
The nasolacrimal duct plays a crucial role in the drainage of tears from the eye into the nasal cavity. It is a part of the lacrimal apparatus and is located in the medial wall of the orbit. Understanding its direction is essential for ophthalmological and otolaryngological procedures.

## **Why the Correct Answer is Right**
The nasolacrimal duct is directed **downwards and laterally** into the inferior meatus of the nasal cavity. This direction allows for the effective drainage of tears from the eye into the nasal cavity, preventing accumulation and potential infection. The duct's course is influenced by its bony canal, which is a part of the lacrimal bone and the inferior turbinate.

## **Why Each Wrong Option is Incorrect**
- **Option A:** If the duct were directed upwards, it would not effectively drain tears into the nasal cavity, as gravity would not assist in the flow.
- **Option B:** A medial direction would misplace the duct's opening, potentially interfering with the nasal septum or other structures.
- **Option C:** While not provided, any direction not aligning with anatomical facts would be incorrect.

## **Clinical Pearl / High-Yield Fact**
A key clinical correlation is that blockage of the nasolacrimal duct can lead to epiphora (excessive tearing) and dacryocystitis (infection of the lacrimal sac). This condition is more common in newborns and can be relieved by probing the duct.

## **Correct Answer:** D. downwards and laterally.