An aberrant psoas major muscle fascicle

Area of Science:

• Anatomy
• Human Anatomy
• Skeletal Muscle Anatomy

Background:

• The psoas major muscle is a key component of the posterior abdominal wall and hip flexor group.
• Anatomical variations in the psoas major muscle are infrequently reported but can have clinical implications.
• Understanding these variations is crucial for accurate anatomical descriptions and surgical procedures.

Purpose of the Study:

• To describe a unique aberrant fascicle of the psoas major muscle discovered during dissection.
• To document the origin, course, and insertion of this anomalous muscle fascicle.
• To contribute to the existing literature on human psoas major muscle variations.

Main Methods:

• Gross anatomical dissection of a human male cadaver.
• Detailed observation and documentation of the aberrant muscle fascicle's origin and path.
• Photographic recording of the anatomical finding.

Main Results:

• An aberrant fascicle of the psoas major muscle was identified.
• This fascicle originated from a tendinous arch spanning the L4 vertebral body and L5 transverse process.
• It coursed independently along the pelvic brim to join the main psoas major muscle fibers superior to the inguinal ligament.

Conclusions:

• This finding represents a previously undescribed variation of the psoas major muscle.
• Such anatomical variations may influence biomechanics and surgical approaches in the lumbar and pelvic regions.
• Further studies are needed to determine the prevalence and functional significance of this aberrant fascicle.