Final answer:
The dorsal (posterior) root ganglion is typically drained by radicular veins, which then connect to larger regional veins, and eventually into the systemic venous circulation. Specific vessels for the dorsal ganglia are not commonly detailed as they are variable and small, and the overall process of CSF reabsorption and drainage is related to the dural sinuses and jugular veins.
Step-by-step explanation:
The vessel responsible for draining the dorsal (posterior) root ganglion is not explicitly mentioned in typical anatomical descriptions as specific vessels for the ganglia tend to vary and be rather small. However, the blood from these ganglia, including the dorsal ganglia, generally gets drained into radicular veins that accompany the spinal nerves and then into larger regional veins such as segmental or intervertebral veins. This venous blood ultimately drains into systemic venous circulation.
The dorsal (posterior) nerve root axons enter the posterior horn of the spinal cord, while the cells within the dorsal root ganglion process sensory information. The ganglion is a cluster of neurons (nerve cells) that the spinal nerves use to transmit sensory data to the brain. The reabsorption of cerebrospinal fluid (CSF) occurs nearby in the arachnoid granulations and is eventually drained into the dural sinuses, which connect to the jugular veins for drainage out of the cranial cavity.