What muscle extends the thumb at metacarpophalangeal joint?

What muscle extends the thumb at metacarpophalangeal joint?

extensor pollicis brevis
The extensor pollicis brevis, extensor indicis proprius, extensor digitorum communis, and extensor digiti minimi extend the MCP joints (von Schroeder, 1993).

What is the joint capsule of the thumb?

The joint capsule of the thumb MP joint is a stout structure that attaches circumferentially around the joint and seals the joint. The joint capsule blends with the palmar plate and the collateral ligaments.

What type of joint is the thumb MCP?

condyloid type synovial joints
Metacarpophalangeal (MCP) joints are condyloid type synovial joints between the metacarpal bones and proximal phalanges of the hands.

Which type of joint is your thumb joint?

Interphalangeal Joint (IP) The thumb digit has only two phalanges (bones) so it only has one joint. The thumb interphalangeal (IP) joint is similar to the distal interphalangeal (DIP) joint in the fingers.

What is normal MCP extension?

It is usual for the ROM of the MCP joints to fall within 90° of flexion to 45° of extension (American Academy of Orthopaedic Surgeons, 1965).

Which is the first MCP joint?

The first CMC joint (known as the thumb’s saddle joint) is the most mobile, especially during the movement of opposition. (The CMC joint of the thumb is extremely important and is described separately in a subsequent section.)

Where is the 1st MCP joint?

The 1st CMC (carpometacarpal) joint is a specialized saddle-shaped joint at the base of the thumb. The trapezium carpal bone of the wrist and the first metacarpal bone of the hand form the 1st CMC or thumb basal joint.

What is MCP joint?

The metacarpophalangeal joint or MP joint, also known as the first knuckle, is the large joint in the hand where the finger bones meet the hand bones. The MCP joint acts as a hinge joint and is vital during gripping and pinching.

Where is the MCP joint located?

The metacarpophalangeal joints (MCP) are situated between the metacarpal bones and the proximal phalanges of the fingers. These joints are of the condyloid kind, formed by the reception of the rounded heads of the metacarpal bones into shallow cavities on the proximal ends of the proximal phalanges.