Lacrimal bones

Small, thin bones located in the inner corner of the eye sockets.

Lacrimal bones are facial bones that form part of the orbit, the bony cavity that encases the eye. Each of these paired bones is situated at the front part of the medial wall of the orbit, contributing to the structure that houses the tear glands. They are among the smallest bones in the human body and play a critical role in the drainage of tears through the nasolacrimal duct.

Terminologia Anatomica

os lacrimale

System

Facial skeleton

Function

The primary function of the lacrimal bones is to support the lacrimal sac, which is essential for the drainage of tears. When tears are produced by the lacrimal glands located above the outer portion of the eye, they flow across the surface of the eye, keeping it moist and removing debris. These tears then enter the lacrimal puncta, small openings on the eyelids, and are directed into the lacrimal sac. The lacrimal bones help provide a pathway for this fluid to continue its journey down through the nasolacrimal canal into the nasal cavity. This drainage system is vital for maintaining ocular health and comfort, preventing excessive tear overflow.

Location

Lacrimal bones are found on each side of the face, specifically located in the inner angle of the eye sockets, also known as the orbits. They are nestled between the frontal bone in the forehead and the maxillary bone that forms the upper jaw. The lacrimal bones articulate with the ethmoid bone, which is located deeper within the skull, and help form the junction between the bony orbit and the nasal cavity. Their precise positioning contributes to the intricate anatomy of the face and the efficient functioning of the eye’s moisture and drainage systems.

Did You Know?

Lacrimal bones are some of the smallest bones in the human body, measuring only about 2 centimeters in size.
Each lacrimal bone holds a small groove that aids in forming the nasolacrimal duct, responsible for tear drainage.
The term 'lacrimal' comes from the Latin word 'lacrima', meaning 'tear'.
In some animals, the equivalent of the lacrimal bone may be significantly different, reflecting varying needs for tear drainage and eye function.