Bilaterally existing sternoclavicularis anticus muscles

Area of Science:

• Anatomy
• Human Morphology
• Skeletal Muscle Anatomy

Background:

• Anatomical variations of the pectoral muscles are infrequently documented.
• Understanding these variations is crucial for surgical procedures and diagnostic imaging.
• The sternoclavicularis anticus muscle is a rare anatomical variant.

Observation:

• A bilateral sternoclavicularis anticus muscle was identified in a 92-year-old Japanese female cadaver.
• The dissection was conducted at Nagoya City University Medical School.
• Detailed gross anatomical features and morphometric measurements were recorded.

Findings:

• The sternoclavicularis anticus muscles were innervated by branches of the lateral pectoral nerves.
• The lateral pectoral nerves originated from the brachial plexus.
• Morphological analysis was performed in the context of known pectoral muscle variations.

Implications:

• This case highlights the importance of recognizing rare anatomical variations during dissection and clinical practice.
• Accurate anatomical knowledge aids in preventing surgical complications.
• Further research into the prevalence and clinical significance of the sternoclavicularis anticus muscle is warranted.