The upper brachial plexus defect model in rhesus monkeys: a cadaveric feasibility study.

Area of Science:

• Neuroscience
• Comparative Anatomy
• Surgical Research

Background:

• The brachial plexus is vital for upper limb function.
• Understanding primate brachial plexus anatomy is key for developing nerve graft models.
• Rhesus monkeys are a common model organism in biomedical research.

Purpose of the Study:

• To characterize the brachial plexus anatomy in rhesus monkeys.
• To establish a foundation for nerve graft research using rhesus monkeys.
• To compare rhesus monkey brachial plexus anatomy with human anatomy.

Main Methods:

• Systematic anatomic dissection of ten rhesus monkey brachial plexuses.
• Measurement of root, trunk, and division lengths and diameters using a Vernier caliper.
• Documentation of the anatomical distribution of key nerves like the suprascapular, axillary, and musculocutaneous nerves.

Main Results:

• The rhesus monkey brachial plexus typically comprises C5-T1 spinal nerve roots, with occasional C4 contribution.
• The lower trunk, formed by C8 and T1, was present in 80% of specimens with measurable dimensions.
• Significant variations in root and trunk structures were observed compared to human anatomy, particularly at the C5-C7 levels.

Conclusions:

• The rhesus monkey brachial plexus exhibits distinct anatomical features compared to humans.
• Identified anatomical variations provide targets for potential nerve graft interventions.
• This study provides essential anatomical data for future research on brachial plexus repair and nerve grafting in a primate model.