Which is the longest muscle in the human body?

Bihar CHO -2019

Applied Anatomy

Easy

Appeared in: Bihar CHO -2019

Explanation

The Sartorius muscle is definitively the longest muscle in the human body.
It is a long, narrow, ribbon-like muscle that originates from the anterior superior iliac spine (ASIS) of the hip bone.
It travels diagonally across the anterior thigh to insert on the medial side of the upper tibia (part of the pes anserinus).
Its unique path makes it the longest muscle, spanning two joints (hip and knee).
It is known as the 'tailor's muscle' because it enables the actions of hip flexion, abduction, external rotation, and knee flexion, which together produce the cross-legged sitting position.

Option A: Gluteus Maximus is the largest muscle in the body by mass and volume, but it is not the longest. Its primary function is powerful hip extension.
Option B: Gluteus Minimus is one of the smallest of the gluteal muscles, located deep in the buttock. It is much shorter than the Sartorius.
Option D: The Deltoid muscle is located in the shoulder and is responsible for arm abduction. While large, its length does not compare to the Sartorius muscle in the thigh.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomical knowledge of major muscles in the human body, specifically identifying the longest muscle as background academic context rather than a clinical decision trigger.
The Sartorius muscle is a key anatomical landmark. Its medial border forms the lateral boundary of the femoral triangle, a crucial area for accessing the femoral artery, vein, and nerve for procedures like cardiac catheterization or arterial blood gas sampling.
In orthopedic surgery, the pes anserinus, where the Sartorius tendon inserts along with two others, is a common site of bursitis and tendonitis, a condition nurses may help manage.
What if the question asked for the 'biggest' muscle? The answer would be the Quadriceps Femoris, which is a group of four muscles on the front of the thigh and is considered the biggest by volume, while Gluteus Maximus is the largest single muscle by mass.

How to Approach the Question

First, identify the core of the question, which is asking for the 'longest' muscle. This is a factual recall question from anatomy.
Pay close attention to the specific superlative used ('longest' vs. 'largest' vs. 'strongest'). These are common distractors in anatomy questions.
Mentally picture or recall the location of each muscle listed in the options.
The Sartorius is a long, strap-like muscle in the thigh. The Gluteal muscles are in the buttock, and the Deltoid is in the shoulder.
Compare the relative lengths. The thigh is the longest segment of the limbs, making a muscle that spans its length a likely candidate.
Confirm the fact: Sartorius is the longest, Gluteus Maximus is the largest by mass. Select the option that matches the question's specific requirement.

Concept Tested & Keywords

Concept Tested: Anatomical knowledge of major muscles in the human body, specifically identifying the longest muscle.
Stem keywords: longest muscle, human body
Lead-in keywords: Which is
Negative lead-in flag: false

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E6 Anatomy Applied Ashalatha 4e p. 342-344

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