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A unique presentation: rectus sternalis.

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    Summary
    This summary is machine-generated.

    A rare Rectus Sternalis muscle variation was found bilaterally in an adult male cadaver, presenting as three distinct slips with unique origins and insertions. This anatomical finding highlights the muscle's variability.

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    Area of Science:

    • Anatomy
    • Human Morphology
    • Skeletal Muscle Anatomy

    Background:

    • The Rectus Sternalis is an uncommon muscle slip located parasternally within the thoracic wall.
    • Its presence and variations are of interest in anatomical studies and clinical practice.

    Observation:

    • During a routine pectoral region dissection, three bilateral slips of the Rectus Sternalis muscle were identified in an adult male.
    • The right side featured one slip (RS1), while the left side had two slips (RS2 and RS3).
    • All slips were situated anterior to the Pectoralis Major muscle.

    Findings:

    • RS1 originated from the External Oblique and Rectus Abdominis aponeuroses; RS2 from the Rectus Abdominis aponeurosis; RS3 from the Pectoralis Major aponeurosis.
    • Tendinous intersections were noted in RS1 and RS3.
    • Measurements indicated RS1 (right) was the largest (3.8cm breadth), RS2 (left) was the smallest, and the second left slip was the longest (12.5cm).
    • RS1 had a flattened tendon that fused with the Sternocleidomastoid muscle origin.

    Implications:

    • Understanding Rectus Sternalis variations is crucial for anatomists, radiologists, and surgeons.
    • Accurate identification prevents misdiagnosis and aids in surgical planning.
    • This knowledge is also relevant for anthropological studies.