labrum

1. A lip or liplike structure, such as the one forming the roof of the mouth in insects.
2. The outer margin of the opening of a gastropod shell.

[Latin, lip.]

A lip-shaped anatomical edge, rim, or structure.

Pl. labra [L.] an edge, rim or lip, e.g. upper lip of insects.

• acetabular l. — the ring of fibrocartilage that is attached to and deepens the acetabulum; large and thick in the horse and cow. Called also acetabular glenoidal labrum.
• acetabular glenoidal l. — see acetabular labrum (above).
• articular l. — a fibrocartilaginous rim around the edge of some joint sockets such as the acetabulum and the glenoid.

Labrum (Latin for "an edge, rim of a vessel") can refer to:

• Labrum (surname), an English surname
• In architecture, a labrum is a large, water-filled vessel or basin with an overhanging lip. Marble labrums were a common feature of Roman thermae.
• In entomology, the labrum is the upper lip of an insect mouth, the lower lip being termed the labium.
• In anatomy:
  • The glenoid labrum is a lip-like projection of cartilage on the human scapula surrounding the joint between the humerus and the collarbone.
  • The acetabular labrum is a ring of cartilage that surrounds the acetabulum (the socket of the hip joint).

See also

• Labium, Latin for "lip"

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