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Comparative Study of Anatomical Surface Landmarks in Standing and Supine Positions

Abstract

The study examines the anatomical surface landmarks observed in standing and supine positions, with emphasis on positional changes in the location, prominence, and relative relationships of selected external anatomical landmarks. Surface landmarks provide important reference points for identifying underlying anatomical structures and are useful in physical examination, clinical procedures, anthropometric assessment, and anatomical education. Changes in body position may alter the visibility and relative position of these landmarks, making comparative evaluation important for understanding their practical application. The study will identify selected anatomical surface landmarks on the body and compare their characteristics in standing and supine positions. The landmarks may include selected bony prominences and palpable structures of the trunk and limbs that can be identified through standardized observation and palpation. Measurements of landmark position, prominence, or relative distance from established anatomical reference points will be obtained using appropriate standardized procedures to allow consistent comparison between the two body positions. A comparative descriptive research design will be adopted for the study. An appropriate sample of healthy young adults will be selected using a suitable sampling technique. Each participant will be examined in both standing and supine positions under standardized conditions, and selected surface landmarks will be identified, marked, and measured where applicable. The collected data will be analyzed using descriptive statistics such as frequency, percentage, mean, and standard deviation, while appropriate inferential statistical tests will be applied to determine significant differences between the two positions. The study is expected to reveal measurable differences in the position, prominence, or relative relationships of some anatomical surface landmarks between standing and supine positions. Certain landmarks may remain relatively stable across both positions, whereas others may show noticeable positional changes due to alterations in body alignment, gravity, soft-tissue distribution, and muscle relaxation. The extent of variation is expected to differ according to the anatomical region and the specific landmark examined. The findings will be useful to anatomists, physiotherapists, radiographers, clinicians, medical educators, and other healthcare professionals who rely on surface landmarks for anatomical orientation and clinical assessment. The study may also provide useful information for students learning practical and surface anatomy by demonstrating how changes in body position can influence the identification and interpretation of external anatomical landmarks. The findings may further support accurate landmark identification during physical examination and other clinical procedures. The study will conclude by documenting the comparative characteristics of selected anatomical surface landmarks in standing and supine positions. It is recommended that body position be considered when identifying and assessing surface anatomical landmarks, particularly where positional changes may influence their visibility or relative location. Further studies involving larger and more diverse populations and additional anatomical regions are also recommended to provide broader reference information on positional variations in surface anatomy.

Keywords: Anatomical surface landmarks, standing position, supine position, surface anatomy, anatomical landmarks, positional variation, body position, palpation, anatomical orientation, external landmarks, functional anatomy, clinical anatomy, young adults, anatomical assessment, practical anatomy.