Question

Sigmoid notch of olecranon process is found in

• A. Tibius-fibula
• B. Femur
• C. Radius-ulna
• D. Humerus

Answer 1

The correct option is C Radius-ulna

• The forelimb is composed of the humerus, radius and ulna, carpals (wrist bones – 8 in number), metacarpals (palm bones – 5 in number) and phalanges (digits – 14 in number). Hence radius-ulna is bones of the forelimb.
  
• The olecranon process is the near end of the ulna and it forms the pointed portion of the elbow.
• Sigmoid notch is a large depression in the upper extremity of the ulna that fits the trochlea of the humerus (the bone directly above the ulna in the arm) as part of the elbow joint. It is formed by the olecranon and the coronoid process.
• Hence sigmoid notch of the olecranon process is found in radius-ulna.
• So, the correct answer is 'Radius-ulna'.