Trochlea

Definitions

  • Webster's Revised Unabridged Dictionary
    • Trochlea (Anat) A pulley, or a structure resembling a pulley; as, the trochlea, or pulleylike end, of the humerus, which articulates with the ulna; or the trochlea, or fibrous ring, in the upper part of the orbit, through which the superior oblique, or trochlear, muscle of the eye passes.
    • Trochlea (Mach) A pulley.
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Century Dictionary and Cyclopedia
    • n trochlea In anatomy and zoology, a pulley or pulley-like arrangement of parts, affording a smooth surface upon which another part glides. Specifically— A fibrous loop in the upper inner corner of the orbit of the eye, through which runs the tendon of the superior oblique muscle of the eyeball. The line of traction of the muscle is by this contrivance deflected at nearly a right angle. This trochlea is not found below mammals. Similar loops (seldom, however, taking the name trochlea) bind down and alter the direction of some other double-bellied muscles, as the digastricus and omohyoid. See cuts under eyeand eyeball.
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Chambers's Twentieth Century Dictionary
    • n Trochlea trok′lē-a a pulley-like cartilage through which the superior oblique muscle of the eye-ball passes: in the elbow-joint, the articular surface of the lower extremity of the humerus, grasped by the greater sigmoid cavity of the ulna
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Etymology

Webster's Revised Unabridged Dictionary
L., a case or sheaf containing one or more pulleys, Gr. . See Trochilics
Chambers's Twentieth Century Dictionary
L. trochlea—Gr. trochalia, a pulley.

Usage

In literature:

The cartilage on the exposed posterior portion of the trochlea seems healthy.
"Anomalies and Curiosities of Medicine" by George M. Gould
G, The trochlea, or pulley over which one of the muscles passes.
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter
In the human skeleton, the internal lip of the trochlea descends lower than the external; and also lower than the condyle.
"Artistic Anatomy of Animals" by Édouard Cuyer
No foramen between third and fourth trochleae of tarso-metatarsus.
"Trees. A Woodland Notebook" by Herbert Maxwell
No foramen between third and fourth trochleae of tarso-metatarsus.
"Extinct Birds" by Walter Rothschild
The KNEE JOINT is a hinge formed by the condyles and trochlea of the femur, the patella, and the head of the tibia.
"Encyclopaedia Britannica, 11th Edition, Volume 15, Slice 5" by Various
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