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Bilateral Variation in Palmaris Longus Muscle Presence Among Undergraduate Students

Abstract

The study examines bilateral variation in palmaris longus muscle presence among undergraduate students, with emphasis on differences in the presence and absence of the muscle between the right and left upper limbs. The palmaris longus is a superficial muscle of the anterior compartment of the forearm that contributes to tension of the palmar aponeurosis and flexion of the wrist. Its presence is highly variable among individuals, and differences may occur between the two sides of the body. The study will determine the pattern of palmaris longus muscle presence among undergraduate students and assess bilateral variation in its distribution. The specific objectives will include determining the proportion of participants with bilateral presence, unilateral presence, and bilateral absence of the muscle, comparing its presence between the right and left upper limbs, and documenting the frequency of each observed pattern within the study population. A cross-sectional descriptive research design will be adopted for the study. An appropriate sample of undergraduate students will be selected using a suitable sampling technique. The presence or absence of the palmaris longus muscle will be assessed bilaterally using standardized clinical examination procedures, with appropriate imaging methods employed where necessary. The collected data will be analyzed using descriptive statistics such as frequency and percentage, while appropriate inferential tests will be applied to determine whether significant differences exist between the right and left sides. The study is expected to reveal different patterns of palmaris longus muscle presence among the participants, including bilateral presence, unilateral presence, and bilateral absence. Variation may also be observed between the right and left upper limbs, with one side potentially showing a different frequency of muscle presence from the other. The findings are expected to demonstrate the considerable anatomical variability of the palmaris longus within the study population. The findings will be useful to anatomists, orthopaedic surgeons, plastic and reconstructive surgeons, physiotherapists, radiologists, and other healthcare professionals involved in the assessment of the upper limb. Knowledge of bilateral variation in palmaris longus muscle presence is particularly relevant because its tendon may be considered for use in reconstructive procedures. The study may also provide useful anatomical reference information for clinical examination and assessment of the forearm and wrist. The study will conclude by documenting the bilateral patterns of palmaris longus muscle presence and absence among the study population. It is recommended that both upper limbs be assessed when determining the presence of the muscle, while further studies involving larger and more diverse populations should be conducted to establish broader reference data on bilateral variation in palmaris longus muscle presence.

Keywords: Palmaris longus, bilateral variation, muscle presence, muscle absence, anatomical variation, forearm muscles, upper limb anatomy, unilateral presence, bilateral absence, undergraduate students, wrist anatomy, clinical anatomy, reconstructive surgery, anatomical examination, human anatomy.