Definition: Craniom refers to the brainstem, which includes the spinal cord and all the nerves that transmit signals from the brain to other parts of the body, including the eyes, ears, hands, feet, and mouth. The craniom contains several important structures such as the olfactory bulb, a type of bulb in the brainstem that is responsible for smell; the corpus callosum, which connects the left and right hemispheres of the brain; and the cerebellum, a part of the brainstem responsible for movement. The term 'craniom' is also used to refer to the lower part of the skull, which is the main structure that contains the brain and spinal cord. In this context, it refers to the lower portion of the skull that includes the base of the skull (the temporal bone), the temporal fossa (which separates the cerebrum from the brainstem), the temporal lobe (which contains the right hemisphere of the brain), and the frontal lobe (which contains the left hemisphere of the brain). The term 'craniom' is also used to describe the area around the brain that contains the brainstem, which is a part of the cerebral cortex. This area includes structures such as the olfactory bulb, the corpus callosum, and the cerebellum.