Lacrimal Bone

The lacrimal bone, also known as the os lacrimale, is a small, rectangular bone located in the skull’s facial skeleton. It is one of the paired bones that form the inner walls of the orbit (eye socket) and contribute to the formation of the tear duct system.

Anatomy

The lacrimal bone is situated between the maxilla bone and the ethmoid bone. It can be divided into the following structures:

• Lacrimal Fossa: Found on the anterior and medial aspect of the lacrimal bone, this shallow depression provides space for the lacrimal gland, which secretes tears.
• Lacrimal Crest: This elongated ridge extends from the frontal process of the maxilla to the lacrimal process of the inferior nasal concha, forming part of the lateral nasal wall.
• Lacrimal Hamulus: Positioned at the lower end of the lacrimal crest, this hook-like projection helps stabilize the lacrimal sac, a structure that collects tears and drains them into the nasal cavity.

Function

The lacrimal bone plays a vital role in the lacrimal apparatus, which is responsible for tear production, drainage, and distribution. It helps protect and support the lacrimal sac and aids tear circulation within the eye, keeping the ocular surface moist and lubricated.