Lacrimal groove

Lacrimal groove is a significant anatomical feature located in the orbital part of the frontal bone and the lacrimal bone. It plays a crucial role in the drainage system of the eye, specifically in the tear drainage mechanism. This groove houses the lacrimal sac, which is part of the lacrimal apparatus responsible for the collection and passage of tears from the eye to the nasolacrimal duct.

Anatomy

The lacrimal groove is situated in the medial wall of the orbit, formed by the junction of the frontal bone and the lacrimal bone. It is a shallow depression that extends from the lacrimal fossa downwards towards the nasolacrimal canal. The lacrimal sac, which sits within this groove, is a key component of the tear drainage system, leading tears away from the surface of the eye to the nasolacrimal duct, which then drains into the nasal cavity.

Function

The primary function of the lacrimal groove, through its support of the lacrimal sac, is to facilitate the drainage of tears and debris from the eye. This is essential for maintaining the health and clarity of the visual field, as well as protecting the eye from infection and irritation. The efficient functioning of this drainage system is critical for visual acuity and overall eye health.

Clinical Significance

Disorders associated with the lacrimal groove and the lacrimal apparatus can lead to tear drainage problems, such as dacryocystitis, which is an infection of the lacrimal sac, or epiphora, which is an overflow of tears onto the face. Such conditions may require medical intervention, ranging from antibiotic treatment to surgical procedures like dacryocystorhinostomy, which creates a new drainage pathway for tears to bypass the blocked nasolacrimal duct.

Surgical Relevance

Knowledge of the lacrimal groove's anatomy is essential for various surgical procedures involving the orbit and nasal cavity, including the aforementioned dacryocystorhinostomy, orbital fracture repairs, and sinus surgery. Surgeons must navigate carefully around this area to avoid damaging the lacrimal apparatus and ensure proper tear drainage post-surgery.

See Also

• Lacrimal apparatus
• Orbital anatomy
• Dacryocystitis
• Epiphora