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Chapter 1: Q. 4 (page 7)

The forearm consists of the:

  1. radius and ulna
  2. radius and humerus
  3. ulna and humerus
  4. humerus and carpus

Short Answer

Expert verified

The correct answer is option (a).

The forearm consists of the radius and ulna.

Step by step solution

01

Introduction 

  • The forearm is made up of two long bones (the radius and ulna), an interosseous membrane, and numerous arteries, nerves, and muscles.
  • The muscles are divided into two groups: anterior and posterior.
  • These muscles are responsible for the flexion and extension of the wrist and fingers, as well as elbow flexion.
02

Step: 2 Explanation for Correct answer

  • The forearm is made up of two long bones called the radius and ulna.
  • The radius is located medially, is longer and larger than the ulna, and travels laterally parallel to the ulna.
  • The separating interosseous membrane holds these two bones together.
  • There are two points at which the forearm bones join. Thus, the option a is correct.
03

Step: 3 Explanation for incorrect answer

  • The humerus is a long bone that connects the elbow to the shoulder and scapula. So, option b is wrong.
  • The humerus and ulna's curving shapes are joined by articulation. The Radius, a smaller forearm bone, is situated outside of the joint. . So, option c is wrong as well.
  • The eight little bones that make it up the wrist, or carpus, which connects the hands to the forearm, are known carpal bones. Hence, option d is wrong too.

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