Question

Olecranon process is found in which of the following bones?
a. Proximal end of ulna
b. Distal end of ulna
c. Proximal end of humerus
d. None of the above.

Answer 1

Hint: Olecranon process is found in the wrist region formed between ulna and humerus bone. The proximal end of the upper limb bones is that area that is close to the shoulder whereas the distal end is far from the shoulder.

Complete answer:
The Olecranon process of the ulna towards the elbow articulates with the large cavity of the humerus bone called Olecranon fossa when the elbow gets extended or becomes straight.

The ulna is a long bone with two extremities and a long shaft. The upper end or proximal end of the ulna is thick and strong, helping in the formation of the elbow joint. The distal end or lower proximity of the ulna is small and has a process called the styloid process projecting downward from the back.

The humerus is the longest bone present at the upper limb. It also consists of a long upper limb. It also consists of a long shaft and two extremities (ends). The upper end or the head of the humerus articulates with the glenoid cavity of the scapula and forms the shoulder joint. The lower proximity or the distal end is flat and broad. This end has Olecranon fossa which articulates with the Coronoid fossa of the ulna when the elbow is bent and articulates with the Olecranon process of the ulna when the elbow is straight.

Hence, The correct answer is option (B).

Note: Process or notch in a bone is the extension of a region from the bone and the fossa is the hollow area of the bone. The upper end or extremity of the ulna is the proximal end present in the elbow and the lower end is the distal end connected with the wrist.
The Elbow joint is an example of a hinge joint that allows the movement only in a single plane.