The Amerindian population of Guyana is approximately 31,000. The tribes consisting of nine major ethnic groups, including the Akawaios, Arawaks, Arekunas, Caribs, Makushis, Patamonas, Wapishanas, Warraus and the Wai-Wais are mainly found in the hinterland or the interior region.
At 31 places along the spinal cord the dorsal and ventral roots come together to form spinal nerves. Spinal nerves contain both sensory and motor fibers, as do most nerves. Spinal nerves are given numbers which indicate the portion of the vertebral column in which they arise.t 31 places along the spinal cord the dorsal and ventral roots come together to form spinal nerves. Spinal nerves contain both sensory and motor fibers, as do most nerves. Spinal nerves are given numbers which indicate the portion of the vertebral column in which they arise.
The corpus callosum is the largest commissural pathway in the brain consisting of over 200 million nerve fibers. It allows for communication between the right and left hemispheres of the brain. The corpus callosum is the largest single structure in the brain. Agenesis=Absence or incomplete development of an organ or body part.