An example for sesamoid bone is:-

Appeared in: AIIMS Manglagiri NO - 2019

Explanation

The patella, commonly known as the kneecap, is the largest sesamoid bone in the human body.
Sesamoid bones are a unique type of bone defined by their location embedded within a tendon or muscle.
The patella is situated within the tendon of the quadriceps femoris muscle. Its function is to act as a pulley, increasing the leverage of the muscle for extending the knee and protecting the joint.

Option B: Ribs are classified as flat bones, not sesamoid bones. Their primary function is to form the protective cage of the thorax.
Option C: Carpals are the bones of the wrist and are classified as short bones, which are typically cube-shaped and provide support with limited movement.
Option D: The sternum, or breastbone, is a flat bone located in the center of the chest that serves as an anchor for the ribs.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of bones (Sesamoid bones) as background academic context rather than a clinical decision trigger.
Knowledge of bone types is fundamental for a nurse when assessing musculoskeletal injuries. A patellar fracture, for example, directly compromises the knee's extensor mechanism, a critical assessment point.
Patellar dislocation is a common injury. Nurses are involved in the initial management, including immobilization, pain control, and patient education on preventive strengthening exercises.
What if? If a patient has chondromalacia patellae ('runner's knee'), the cartilage under the sesamoid patella is damaged. Nursing care focuses on pain management (RICE protocol) and teaching quadriceps-strengthening exercises.

How to Approach the Question

First, identify and define the key term in the question: 'sesamoid bone'. Recall that this is a bone embedded within a tendon.
Systematically evaluate each option against this definition.
Consider the Patella (kneecap). It is famously located in the quadriceps tendon in front of the knee.
Analyze the other options: Ribs (flat bones), Carpals (short bones), and Sternum (flat bone).
Conclude that the Patella is the only option that fits the specific classification of a sesamoid bone.

Concept Tested & Keywords

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E6 Anatomy BDChaurasia V2 10e Part 1 p. 43-45

E6 Osteology InderbirSingh 5e p. 137-139

Practise the full AIIMS Manglagiri NO - 2019

Attempt every question from this paper in a timed mock, then review the full solution for each one.