The dorsal root ganglia (DRG) are clusters of sensory neuron cell bodies located near the spinal cord, playing a crucial role in transmitting sensory signals. This article outlines the dissection process for isolating DRG from rat spinal tissue.
The dorsal root ganglia or DRG are clusters of cell bodies of sensory neurons lodged within the vertebrae on either side of the spinal cord. Their primary function is to transmit sensory neuronal signals from the peripheral nervous system to the central nervous system.
To isolate the dorsal root ganglia, begin by taking a freshly harvested rat spine. Dissect the spine to separate the cervical, thoracic, and lumbar regions. Keep the spine sections in a suitable buffer to ensure tissue hydration.
Now, position the thoracic section with its dorsal side facing up. Divide the section into two lateral halves. Next, secure the dissected half of the spine segment, medial side up. Gently detach the bisected spinal cord - a long, tubular structure - from the segmented vertebral bones of the section to reveal the underlying DRG.
The DRG appear as distinct white masses with dorsal and ventral roots embedded within the spinal canal. With fine forceps, carefully pull out the DRG to dislodge it from the spinal canal. Finally, transfer the harvested DRG into a suitable media for further downstream applications.
Clean the dorsal skin of a euthanized rat with 70% ethanol and use scissors to remove the spine. Separate the cervical, thoracic, and lumbar regions, and place the spine sections in a 10-centimeter culture dish with PBS to keep the tissue samples hydrated.
Using delicate bone scissors, open the thoracic and cervical vertebral bones in the dorsal and ventral aspects to separate the spine into two lateral halves, and place the tissue sections into a clean 10-centimeter dish with fresh PBS. Using forceps, gently detach the spinal cord from the vertebral bones to visualize the dorsal root ganglions.
Placing the tips of a pair of fine forceps held under each ganglion, grasp the tissue and pull it from the bone cavity in which it is lodged. Immediately after harvesting, place each ganglion into DMEM culture medium supplemented with 2% Penicillin and Streptomycin or Pen/Strep and 10% Fetal Bovine Serum or FBS to help prevent bacterial contamination of the nerve tissues.
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