What is the definition of labrum?

What is the definition of labrum?

Definition of labrum 1 : an upper or anterior mouthpart of an arthropod consisting of a single median piece in front of or above the mandibles. 2 : a ring of fibrous cartilage forming the margin of the shallow cavity of the upper part of the scapula by which the humerus articulates with the shoulder girdle.

What is the labrum and its function?

The hip labrum is a gasket-like structure that lines the periphery of the acetabulum, or socket of the hip joint. Like the gaskets that seal the joints between the pipes in your house, the acetabular labrum provides a suction seal for your hip joint — adding to the stability to the joint.

What is labrum in hip?

A hip labral tear involves the ring of cartilage (labrum) that follows the outside rim of your hip joint socket. Besides cushioning the hip joint, the labrum acts like a rubber seal or gasket to help hold the ball at the top of your thighbone securely within your hip socket.

Is the labrum the upper lip?

The labrum is a flap-like structure that lies immediately in front of the mouth in almost all extant Euarthropoda. In entomology, the labrum amounts to the “upper lip” of an insect mouth, the corresponding “lower lip” being the labium.

Is labrum part of synovial joint?

A labrum is the ring of cartilage covering the rim of a ball-and-socket joint such as the hip or shoulder. Synovial fluid and the labrum provide lubrication and a smooth surface to assist in the joint’s natural movement.

Is labrum a ligament?

This rim of cartilage is called the “labrum”. Ligaments surround and connect the ball to the socket. These ligaments attach directly to the ball but attach to the labrum as opposed to the bone at the socket. The labrum attachment to the bone is the “weak link” of this setup.

Is the labrum a ligament or tendon?

The labrum is the attachment site for the shoulder ligaments and supports the ball-and-socket joint as well as the rotator cuff tendons and muscles. It contributes to shoulder stability and, when torn, can lead to partial or complete shoulder dislocation. Illustration of the shoulder anatomy and labrum.

Where is the labrum of the hip located?

The hip labrum is a ring of strong, flexible cartilage that rims the outer edge of the hip socket (acetabulum). The labrum serves several purposes, including: Deepening the joint and increasing the surface area of the hip socket by 21% Allowing for a significant range of motion.

Where is the labrum in an insect?

upper lip
The labrum is often called an insect’s upper lip. The labrum is flattened piece of cuticle at the base of the insect’s “face” and above the mouthparts. The labrum partially or completely obscures the mandibles and helps hold food in a position when the insect feeds.

What insects have a labrum?

(A) grasshopper, (B) honey bee, (C) butterfly (D) mosquito. Bembix rostrata female using its labrum in sucking the blood out of a fly.

What is the difference between labral and labrum?

The labrum is a piece of fibrocartilage (rubbery tissue) attached to the rim of the shoulder socket that helps keep the ball of the joint in place. When this cartilage is torn, it is called a labral tear. Labral tears may result from injury, or sometimes as part of the aging process.