The Question is from neet-zoology locomotion-and-movement joints, and it was created by the author Mr. BALACHANDRA.N

Question

A patient presents with limited supination and pronation of the forearm. Which of the following joint structures is MOST likely affected?

Mr. BALACHANDRA.N · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Anatomy and function of the forearm joints.
 **Related Topics**: Supination and pronation movements, radioulnar joints.
 **Prerequisites**: Understanding of the bones and joints of the forearm.
## SOLUTION PATHWAY
**Given Information**:
  The patient has limited supination and pronation of the forearm.
  This indicates a problem with the joints responsible for these movements.
**Method & Steps**:
 1. Identify the joints involved in forearm rotation.
  Reasoning: Supination and pronation occur primarily at the radioulnar joints.
 2. Determine which radioulnar joint is most crucial for these movements.
  Working: Both the proximal and distal radioulnar joints contribute to supination and pronation. However, the proximal radioulnar joint is the primary joint responsible for the majority of the rotation. The distal radioulnar joint allows for a smaller range of motion.
  Key Point: The head of the radius rotates against the radial notch of the ulna at the proximal radioulnar joint.
 3. Conclude which joint is most likely affected.
  Result: The proximal radioulnar joint is the most likely affected joint.
  Verification: Limited supination and pronation directly correlate with dysfunction in the proximal radioulnar joint.
 ## OPTION ANALYSIS
A :x: The distal radioulnar joint contributes to pronation and supination, but to a lesser extent than the proximal radioulnar joint.
B :x: The radiocarpal joint is the wrist joint; it does not directly participate in forearm rotation.
C ✓: The proximal radioulnar joint is the primary joint responsible for supination and pronation.
D :x: The humeroulnar joint is the elbow joint; it primarily allows for flexion and extension of the elbow, not forearm rotation.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing the roles of the proximal and distal radioulnar joints: Remembering that the proximal joint is the primary site for rotation is crucial.
  2.Including the radiocarpal joint: The radiocarpal joint's role in wrist movement should be distinguished from the radioulnar joints' role in forearm rotation.
 **Quick Tips**:
  1.Visualize the anatomy of the forearm joints and how the radius rotates around the ulna.
  2.Associate supination and pronation with the radioulnar joints.

Mr. BALACHANDRA.N · Answer

Distal radioulnar joint

Mr. BALACHANDRA.N · Answer

Radiocarpal joint

Mr. BALACHANDRA.N · Answer

The correct Option is "Proximal radioulnar joint"

Mr. BALACHANDRA.N · Answer

Humeroulnar joint

NEET Zoology Locomotion And Movement Joints MCQs

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