## **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, backwards, and laterally. This specific direction allows it to drain tears from the lacrimal sac into the inferior meatus of the nasal cavity. The duct's course is somewhat oblique, which helps in preventing the reflux of nasal contents into the duct.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Incorrect because the nasolacrimal duct does not drain directly upwards or in a straightforward vertical manner.
- **Option B:** Incorrect as the duct's direction is not solely backwards; it also has a downward and lateral component.
- **Option C:** This seems to align with the correct anatomical description, which involves a downward, backward, and lateral direction. Without the visual, we infer based on standard anatomy.
- **Option D:** Incorrect because the description does not accurately reflect the anatomical direction of the nasolacrimal duct.

## **Clinical Pearl / High-Yield Fact**
A key clinical correlation is that blockage or dysfunction of the nasolacrimal duct can lead to epiphora (excessive tearing) and dacryocystitis (infection of the lacrimal sac). The direction and anatomy of the duct are critical for procedures like dacryocystorhinostomy (DCR), which creates a new passage for tear drainage.

## **Correct Answer:** C. Downwards, backwards and laterally.