Left-right asymmetry in the thoracic spinal cord

Area of Science:

• Neuroscience
• Comparative Anatomy
• Spinal Cord Research

Background:

• Growing evidence suggests left-right asymmetry in the spinal cord.
• Previous studies have indicated functional and developmental asymmetries.

Purpose of the Study:

• To provide a specific anatomical example of spinal cord asymmetry.
• To quantify left-right differences in dorsal root entry points in feline thoracic spinal cords.

Main Methods:

• Analysis of anatomical measurements from experimental protocols spanning nine years (36 cats).
• Quantitative assessment of dorsal root entry positions in thoracic segments T5-T9.
• Validation of findings using measurements from undamaged spinal cord regions in an additional 36 cats.

Main Results:

• A consistent rostral shift in dorsal root entry points was observed on the right side compared to the left.
• The rostral-most root on the right was up to 4.5 mm more rostral (mean 0.93 mm).
• The caudal-most root on the right was up to 5.5 mm more rostral (mean 0.98 mm).

Conclusions:

• The study demonstrates a quantifiable anatomical left-right asymmetry in the feline thoracic spinal cord.
• These findings contribute to the understanding of spinal cord structural organization.
• The implications of this asymmetry for spinal cord function and development warrant further investigation.