Phrenology an early method of assessing personality traits and mental abilities by measuring bumps on the skull. Broca"s area the left frontal region of the brain that is crucial to the production of language. Parts of the brain are as different in their structure and organization as the roles the fulfill. Spinal cord part of the cns, a rope of neural tissue that runs inside the hollows of the vertebrae from just above the pelvis and into the base of the skull. gray and white matter are distinguishable through the brain as well: stretch reflex. The spinal cord handles the spinal reflex one of the most basic behaviours. This is the conversion of sensation into action by a handful of neurons and the connections between them: the brainstem house the basic programs of survival. The sc continues intro the brain skull, there is thickens and becomes more complex and becomes the brain stem.