How many bones are there in the lower extremities in a normal adult?

Appeared in: AIIMS Patna NO - 2020

Explanation

Each lower limb in an adult human consists of 30 individual bones.
The bones include the femur (1), patella (1), tibia (1), fibula (1), tarsals (7), metatarsals (5), and phalanges (14).
Summing the bones for one limb gives a total of 30 (1+1+1+1+7+5+14).
For both lower extremities, the total count is 30 bones per limb multiplied by 2, which equals 60 bones.

Option A: This is an incorrect calculation of the bones in the lower extremities.
Option B: This count incorrectly includes the two hip bones (pelvic girdle) along with the bones of the free lower limbs.
Option C: This is an incorrect calculation of the bones in the lower extremities.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the appendicular skeleton, specifically the bones of the lower extremities as background academic context rather than a clinical decision trigger.
Knowledge of the exact number and location of bones is fundamental for nurses in orthopedics to accurately assess, document, and manage fractures.
Understanding the structure of the lower limbs is crucial for analyzing a patient's gait, balance, and weight-bearing capabilities, which are key components of mobility assessments.
What if? If the question asked for the total bones in the appendicular skeleton, the answer would be 126. This includes the lower limbs (60), upper limbs (60), pelvic girdle (2), and pectoral girdle (4).

How to Approach the Question

First, identify the core of the question, which is a factual recall about the number of bones in a specific body region ('lower extremities').
Recall the anatomical composition of one lower limb. Systematically list the bones from proximal to distal: thigh (femur), kneecap (patella), leg (tibia, fibula), ankle (tarsals), foot (metatarsals), and toes (phalanges).
Sum the number of bones for one limb: 1 (femur) + 1 (patella) + 1 (tibia) + 1 (fibula) + 7 (tarsals) + 5 (metatarsals) + 14 (phalanges) = 30.
Since the question asks for 'lower extremities' (plural), multiply the count for a single limb by two: 30 x 2 = 60.
Compare your calculated result (60) with the given options and select the matching one.
Consider common distractors. Be aware that '62' is a frequent incorrect choice that wrongly includes the pelvic girdle. Confirm that the question asks only for the extremities.

Concept Tested & Keywords

Concept Tested: Anatomy of the appendicular skeleton, specifically the bones of the lower extremities.
Stem keywords: bones, lower extremities, normal adult
Lead-in keywords: How many

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E6 Anatomy BDChaurasia V2 10e Part 1 p. 24-26

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.