The angular artery begins at the end of the facial artery. It ascends toward the eye, supplying the lachrymal duct and orbicularis palpebrarum muscles. The angular artery also has branches in the cheek. Research Angular Artery
The eyelids are two folds of skin that shield the eyeball. The upper lid is larger and more movable. It regulates the opening and closing of the eye with the help of the orbicularis palpebrarum muscle. Lower-lid movement is slight. The eyelids sweep dirt from the surface of the eye, protect it from injury, and help distribute the tear fluid. When the eye is closed, the lids unite at the lid-slit in a downward curve. The corners of the eye are called the inner canthus, which is near the opening of the lachrymal duct, and the outer canthus, which ends in the crease where the upper lid overlaps the lower lid. The eyelid is lined with a mucousmembrane called the conjunctiva. This lining also covers the front of the eyeball. This covering, when washed with tears, gives the eye its glossy appearance. Research Eyelid
The lachrymal duct is one of two channels that secretes the sterile tear fluid that constantly bathes the front of the eye and its thin protective covering membrane, the conjunctiva. Although tear flow is continual, only about 1/2 to 2/3 of a gram of fluid is produced per day. The lachrymal duct is located in the inner corner of the lower eyelid. Research Lachrymal Duct
The lachrymal gland is a gland beneath the upper eye lid which secretes tears which drain from the inner corner of the eye through the Lachrymal duct to the nose. Research Lachrymal gland
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
Abbreviations
Research Angular Artery
