What is the trochlea?
The trochlea is a term used for certain anatomical features in the human body that resembles a pulley. It is a simple device consisting of a wheel that has a groove through which a rope or a string for lifting objects passes. The term, which is of Latin origin, actually means a pulley.
One of the more common uses of the trochlea is the term trochlea humerus. This is the surface of the humerus - the lonely long bone of the upper arm that extends from the shoulder to the elbow - which is articulated with the ulna in the elbow. Ulna is one of the two long bones that form the lower arm or forearm.
The union of trochlea humerus and ulna creates a joint so that the forearms can move, but in one plane that consists of forward and backwards. The part of the ulna, which connects to this part of the humerus, is referred to as a trochlear notch. These are also other terms, such as the trochlear Notch of Ulny, a semilunar notch and a large signmoid cavity.
The trochle of the humerus itself is best described as deep depression on the bottomThe end of the humerus. It is directly below the coronoid fossil. It is a depression that carries a circular coronoid process of ulna for forearm flexion.
trochlea can also be found in the term trochlear process, which is also known as the fibular trochlea calcaneus. It is an increase in the side of the heel between the tendons of two muscles of the lateral compartment of the foot. These are peroneus longus and peroneus brevis, muscles responsible for turning the foot sole inside out.
Another main application for the term trochlea is in guides for certain body muscles. For example, the trochle of the superior oblique oblique acts as a pulley of the eye. It is named for the muscles that leads, which is an excellent oblique muscle. Also known as Oculi Superior, he is responsible for the depression and rotation of the eyeball, especially when the eye is moved to the center of the eye socket.
Oliquus oculi Superior is a origin for naming a trochlear nerve. Is responsible for providingRuns the trochle of the superior oblique with innervation. The trochlear nerve is also called the fourth skull nerve or fourth nerve.