Tarsals of the ankles are examples of which type of bone?

Appeared in: AIIMS Patna NO - 2020

Explanation

The tarsal bones of the ankle are correctly classified as short bones.
Short bones are defined as being approximately cube-shaped, with their length, width, and thickness being nearly equal.
This structure provides stability and support with a limited range of motion, which is essential for the weight-bearing function of the ankle.
Other examples of short bones include the carpal bones found in the wrist.

Option B: Sesamoid bones are bones that are embedded within a tendon or muscle. They act like pulleys, providing a smooth surface for the tendon to slide over. Tarsals are part of the main foot skeleton, not embedded in tendons.
Option C: Long bones are characterized by being significantly longer than they are wide. They function as levers for movement. Tarsals are compact and cube-shaped, not elongated.
Option D: Pneumatic bones contain air-filled spaces or sinuses, which makes them lighter. These are primarily found in the skull.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of bones based on shape as background academic context rather than a clinical decision trigger.
The arrangement of short bones in the ankle creates a strong, compact structure that is crucial for weight-bearing and shock absorption during activities like walking, running, and jumping.
A nurse should be aware that fractures of tarsal bones (e.g., talus or calcaneus) can significantly impair a patient's mobility and may require prolonged immobilization or surgery to ensure proper healing and restore foot function.
What if? If the question had asked about the bones of the toes (phalanges), the answer would be 'Long bones' (specifically, miniature long bones), as they have a shaft and two ends, despite their small size.

How to Approach the Question

First, identify the key anatomical term in the question: 'Tarsals of the ankles'.
Recall the major classifications of bones based on their shape: long, short, flat, irregular, and sesamoid.
Visualize or remember the location and general shape of the tarsal bones. They are small, blocky/cube-like bones that make up the ankle and rear part of the foot.
Compare this characteristic shape to the definitions of the options provided.
Eliminate the incorrect options: 'Long bones' are elongated (e.g., femur); 'Sesamoid bones' are found within tendons (e.g., patella); 'Pneumatic bones' have air spaces and are in the skull.
Conclude that 'Short bones' is the only classification that accurately describes the cube-like shape and function of the tarsals.

Concept Tested & Keywords

Qlsy2Yjj0bvKDGQsuaN4Wm

E6 Anatomy Applied Ashalatha 4e p. 270-272

E6 Physiology Ganong 27e Vol 2 Part 3 p. 31-33

Practise the full AIIMS Patna NO - 2020

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