GROSS ANATOMY

GROSS ANATOMY

UPPER LIMB JOINTS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The pulley or spindle shaped portion of the humerus is called the ____ ?
A
olecranon process
B
capitulum
C
trochlea
D
None of the above
Explanation: 

Detailed explanation-1: -Trochlea-a spindle-or pulley-shaped region (trochlea = “pulley”), which articulates with the ulna bone; it is medial to the capitulum. Olecranon Fossa-a larger depression on the posterior, distal aspect of the humerus; receives the olecranon process of the ulna when the forearm is fully extended.

Detailed explanation-2: -In the human arm, the humeral trochlea is the medial portion of the articular surface of the elbow joint which articulates with the trochlear notch on the ulna in the forearm.

Detailed explanation-3: -An anatomical structure resembling a pully is known as a trochlea; “trochlea” is a Greek word, the English meaning of the trochlea is pully. In the human body, many pulley-like structures are known as a trochlea; for example, the medial part of an articular area at the lower end of the humerus is called the trochlea.

Detailed explanation-4: -Trochlea. The trochlea has a surface shaped like a pulley and covers the anterior, posterior and inferior surfaces of the medial condyle of the humerus. It articulates with the ulna at the trochlear notch.

Detailed explanation-5: -The trochlea forms the articular surface of the medial column of the elbow and is responsible for allowing ulnohumeral flexion and extension. Fractures of the humeral trochlea can result in elbow stiffness, instability, and post-traumatic arthritis.

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