Which of the following does not belong in the group?

Appeared in: RML 2023

Explanation

Humerus is the bone of the upper arm, belonging to the upper limb.
Femur, Tibia, and Fibula are all bones of the leg, belonging to the lower limb.
The question requires identifying the bone that does not fit the category established by the other three options, which are all lower limb bones.

Option A: This is a bone of the lower limb, similar to the Tibia and Fibula. The group's common characteristic is being part of the lower limb, and the question asks for the one that does not belong.
Option B: This is a bone of the lower limb, similar to the Femur and Fibula. It fits within the group of lower limb bones.
Option C: This is a bone of the lower limb, similar to the Femur and Tibia. It belongs to the category of lower limb bones.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of appendicular skeleton bones as background academic context rather than a clinical decision trigger.
Nurses must have a precise understanding of anatomy to accurately assess patients, document findings (e.g., fracture locations), and communicate effectively with the healthcare team.
Knowledge of bone locations is critical for applying splints, casts, or traction, and for identifying landmarks for injections or pulse checks.
What if the options were Scapula, Clavicle, Humerus, and Femur? In that case, Femur would be the outlier, as the other three bones are part of the pectoral (shoulder) girdle and upper limb.

How to Approach the Question

First, identify the type of question. This is an 'odd one out' or 'classification' question.
Read the options: Femur, Tibia, Fibula, Humerus. Recognize that these are all long bones of the limbs.
Categorize each bone based on a common anatomical principle. The most obvious one is its location in the body (upper vs. lower limb).
Categorize: Femur (lower limb), Tibia (lower limb), Fibula (lower limb), Humerus (upper limb).
Identify the option that falls into a different category. Humerus is the only upper limb bone in the list.
Conclude that Humerus is the one that 'does not belong' to the group of lower limb bones.

Concept Tested & Keywords

Concept Tested: Classification of appendicular skeleton bones
Stem keywords: Femur, Tibia, Fibula, Humerus
Lead-in keywords: does not belong
Negative lead-in flag: This question uses negative framing ('does not belong') to ask the test-taker to identify the outlier in a group.

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E6 Anatomy BDChaurasia V2 10e Part 1 pp. 36-38, 50-52

E6 Anatomy Applied Ashalatha 4e p. 494-496

Practise the full RML 2023

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