Trochlea
Trochlea
Trochlea (pronunciation: trok-lee-uh) is a term used in anatomy to describe a structure that resembles a pulley. The term is derived from the Greek word "trokhileia", which means pulley.
Etymology
The term "trochlea" is derived from the Greek word "trokhileia", which means pulley. It was first used in the anatomical context to describe structures that have a groove or furrow, similar to the groove in a pulley system where a rope or belt would run.
Anatomy
In human anatomy, the term "trochlea" is used to describe several different structures:
- The trochlea of humerus is a part of the upper arm bone (humerus) that interacts with the ulna in the forearm to form a hinge joint, allowing for flexion and extension of the arm.
- The trochlea of the talus is a part of the ankle joint, where it interacts with the tibia and fibula to allow for movement of the foot.
- The trochlea of the femur is a part of the knee joint, where it interacts with the patella (kneecap) to allow for movement of the leg.
- The trochlea of the superior oblique is a part of the eye, where it acts as a pulley for the superior oblique muscle, allowing for movement of the eye.
Related Terms
- Pulley: A simple machine that changes the direction of a force, often to lift a load. The trochlea in the human body functions similarly to a pulley in a machine.
- Humerus: The bone of the upper arm or forelimb, forming joints at the shoulder and the elbow.
- Talus: The large bone in the ankle that articulates with the tibia of the shin and the calcaneus of the heel.
- Femur: The bone of the thigh or upper hind limb, articulating at the hip and the knee.
- Superior oblique: A muscle in the orbit, or eye socket, which primarily rotates the eyeball.
External links
- Medical encyclopedia article on Trochlea
- Wikipedia's article - Trochlea
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