0 a long, narrow, hollow space in a surface in the body that a bone or tendon can move against, especially the lower end of the humerus (= the long bone of the upper arm):
the trochlea of the humerus
It loops through a pulley-like structure (the trochlea of superior oblique) and inserts into the sclera on the posterotemporal surface of the eyeball.
It composed of two bones, the humerus and ulna, and is the junction between the trochlear notch of ulna and the trochlea of humerus.
On the lateral side is commonly a tubercle called the peroneal trochlea, under which is a groove for the tendon of the peroneus longus.
The superior oblique muscle ends in a tendon that passes through a fibrous loop, the trochlea, located anteriorly on the medial aspect of the orbit.
The trochlea has the capitulum located on its lateral side and the medial epicondyle on its medial.
Acquired cases that have active inflammation of the superior oblique tendon may benefit from local corticosteroid injections in the region of the trochlea.
Between the capitulum and the trochlea of the humerus is the capitulotrochlear groove.
The humerus also shares some features with extinct hominoids: a large medial epicondyle and a comparatively wide trochlea.
