posterior root the posterior, or sensory, division of each spinal nerve, attached centrally to the spinal cord and joining peripherally with the anterior root to form the nerve before it emerges from the intervertebral foramen; each posterior root bears a spinal ganglion that conveys sensory fibers to the spinal cord.he sensory division of each spinal nerve, attached centrally to the spinal cord and joining peripherally with the ventral root to form the nerve before it emerges from the intervertebral foramen.
Most published information about the life span of saltwater fish are from public aquariums where the fish are kept in the best possible conditions. Many saltwater fish succumb to illness early in life due to poor husbandry. Some saltwater species only live an average of 2 to 4 years.
Report Abuse. 1  The actual life span of goldfish was recorded 45 yrs old if they have been kept in proper conditions such as big fish tanks. Goldfish is reaallly a good choice for pet. 2  Actually, the average lifespan of a goldfish is about 15-20 years. 7 years is under care, but not the greatest. Most dont even make it to a year because people are idiots.