Which muscle present in anterior aspect of thigh?

Appeared in: SJH Nursing Officer - 2019

Explanation

The Rectus femoris muscle is situated in the anterior (front) compartment of the thigh, which is consistent with the question.
It is one of the four muscles that constitute the quadriceps femoris group, the main extensor of the knee.
The primary actions of the rectus femoris are to extend the leg at the knee joint and to flex the thigh at the hip joint. It is often called the 'kicking muscle'.
It is innervated by the femoral nerve, as are the other muscles in the anterior compartment of the thigh.

Option B: The hamstring muscles (a group including biceps femoris, semitendinosus, and semimembranosus) are located on the posterior (back) aspect of the thigh, not the anterior aspect.
Option C: The deltoid muscle is located in the shoulder, forming the rounded contour of the shoulder joint. It is not a thigh muscle.
Option D: The tibialis anterior muscle is located on the anterior aspect of the lower leg (the shin area, between the knee and the ankle), not the thigh.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of lower limb muscles as background academic context rather than a clinical decision trigger.
The quadriceps femoris group, including the rectus femoris, is tested clinically using the patellar tendon reflex (knee-jerk reflex). This reflex assesses the integrity of the femoral nerve and the L2-L4 spinal cord segments.
The vastus lateralis, another muscle in the anterior thigh compartment, is a common and preferred site for intramuscular (IM) injections, especially in infants and young children, due to its large muscle mass and distance from major nerves and blood vessels.
What if? If the question asked for a muscle on the posterior aspect of the thigh, 'Hamstring' would be the correct answer.

How to Approach the Question

First, identify the key anatomical terms in the question: 'anterior aspect' (front) and 'thigh' (the upper part of the leg between the hip and the knee).
Second, systematically evaluate each option based on its known anatomical location.
Recall or deduce that Rectus femoris is a primary muscle of the quadriceps group, located on the front of the thigh.
Eliminate 'Hamstring' as it is on the posterior thigh.
Eliminate 'Deltoid' as it is a shoulder muscle.
Eliminate 'Tibialis anterior' as it is on the lower leg (shin), not the thigh.

Concept Tested & Keywords

Qazz8q7KiykZjlUk4m_PVH

E6 Anatomy BDChaurasia V2 10e Part 1 pp. 75-77, 74-76

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