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Musculus comitans nervi mediani (M. palmaris profundus)
K Sahinoglu1, M D Cassell, R Miyauchi
1Department of Anatomy, University of Iowa College of Medicine, Iowa City 52242.
Summary
Rare palmaris profundus muscles were discovered in two cadavers, presenting unique anatomical variations. These muscles, closely associated with the median nerve, suggest a potential new classification: "musculus comitans nervi mediani".
Area of Science:
- Anatomy
- Human Anatomy
- Upper Limb Anatomy
Background:
- The palmaris longus muscle is a superficial forearm muscle.
- Variations in forearm muscles can impact anatomical studies and surgical procedures.
Purpose of the Study:
- To document and describe the rare palmaris profundus muscle.
- To highlight the anatomical relationship between this muscle and the median nerve.
Main Methods:
- Routine cadaveric dissection of the upper limb.
- Gross anatomical observation and description of muscle morphology and relationships.
Main Results:
- The palmaris profundus muscle was identified in two cadavers.
- Two distinct forms of the muscle were observed, both differing from the typical palmaris longus.
- In both cases, the muscle shared a fascial sheath with the median nerve, and in one instance, the median artery.
Conclusions:
- The palmaris profundus muscle exhibits significant anatomical variations.
- Its intimate association with the median nerve warrants consideration for a new name, such as "musculus comitans nervi mediani".
- This finding has implications for understanding forearm anatomy and neurovascular relationships within the carpal canal.