Higher-level pain pathways
Brain Many regions of the brain can influence the input arriving at lower levels of the nervous system. This descending inhibition can…
Brain Many regions of the brain can influence the input arriving at lower levels of the nervous system. This descending inhibition can…
Deep within the cerebral hemispheres, large gray masses of nerve cells, called nuclei, form components of the basal ganglia. Four…
Deep within the white matter of the cerebral hemispheres are cavities filled with cerebrospinal fluid that form the ventricular system. These cavities…
Lobes of the cerebral cortex The cerebral cortex is highly convoluted; the crest of a single convolution is known as a gyrus, and the fissure between…
Spinal cord, major nerve tract of vertebrates, extending from the base of the brain through the canal of the spinal column. It is composed of…
Spinal cord injury, any of various conditions caused by damage to the tract of nerves that extends from the base of the brain through…
In the second week of prenatal life, the rapidly growing blastocyst (the bundle of cells into which a fertilized ovum divides) flattens into what…
Human nervous system, system that conducts stimuli from sensory receptors to the brain and spinal cord and conducts impulses back to other parts of…
Outcome after traumatic brain injury can vary widely depending on the location and extent of damage, age and sex of…
The initial trauma to the brain that kills or damages nerve cells is only the first step in a drawn-out and complex…
Traumatic brain injury, any damage to the brain from an applied force. The forces involved can be from direct contact, as in a…
Living things are defined in terms of the activities or functions that are missing in nonliving things. The life processes…