Question

Trochlea of humerus articulates with the
A. Glenoid cavity
B. Sigmoid notch
C. Acetabulum
D. Carpals

Answer 1

Hint: Humerus is the long bone that is present in the arms. This bone runs from the shoulder to the elbow. The humerus connects the scapula and the two bones of the lower arm i.e radius and ulna. The body of the humerus is cylindrical in its upper portion and more prismatic below.

Complete Answer:
Trochlea of humerus: In the human arm, the humerus trochlea is the medial portion of the articular surface of the elbow joint.
- The trochlea of the humerus articulates with the trochlear or sigmoid notch on the ulna in the forearm.
- In humans and apes trochlea of the humerus is trochlea form and it is cylindrical in monkeys and conical in some prosimians.
- Trochlea presents a deep depression between two well marked borders. It is convex from before backward, concave from side to side, and occupies the anterior, lower and posterior parts of the extremity.
- The trochlea has the capitulum which is located on the lateral side of the trochlea and medial epicondyle on the medial of the trochlea.
Therefore, it has been clear from the above discussion that the trochlea of humerus articulate with the sigmoid notch.

Hence, option B is the correct option for this question.

Note: A bone is a rigid organ which constitutes the part of skeleton in the animals. Bones protect the various organs of the body from any kind of injury. Bones provide structure and support to the body. Bones produce red blood cells which are responsible for oxygen and carbon dioxide transportation and White blood cells which are responsible for providing immunity to the body against many pathogens. Bones are of various shapes and sizes. The largest bone present in the human body is Femur which is a thigh bone. The smallest bone present in the body of the human is stapes which is the ear bone.