Posterior lacrimal crest

Posterior lacrimal crest

The posterior lacrimal crest is a bony ridge located on the lacrimal bone of the human skull. It is an important anatomical feature in the orbit and plays a crucial role in the lacrimal apparatus, which is responsible for the production and drainage of tears.

Anatomy

The posterior lacrimal crest is situated on the lateral surface of the lacrimal bone. It forms the posterior boundary of the lacrimal fossa, a depression that houses the lacrimal sac. The lacrimal sac is part of the nasolacrimal duct system, which drains tears from the eye into the nasal cavity.

Function

The primary function of the posterior lacrimal crest is to provide structural support to the lacrimal sac. It also serves as an attachment point for the orbicularis oculi muscle, specifically the lacrimal part of this muscle, which aids in the proper functioning of the lacrimal apparatus.

Clinical Significance

Injuries or fractures involving the posterior lacrimal crest can lead to complications in tear drainage, potentially causing conditions such as dacryocystitis, an infection of the lacrimal sac. Surgical procedures involving the lacrimal apparatus, such as dacryocystorhinostomy, often require a detailed understanding of the posterior lacrimal crest's anatomy.

Related Structures

• Anterior lacrimal crest
• Lacrimal sac
• Nasolacrimal duct
• Lacrimal bone
• Orbicularis oculi muscle

See Also

• Lacrimal apparatus
• Orbit (anatomy)
• Tears