A<unk>  connects one part of the nervous system to another using bundles of axons called tracts. The optic tract that extends from the optic nerve is an example of a<unk>  because it connects the eye to the brain; additional<unk> s within the brain connect to the visual cortex. A<unk>  is the connection formed by axons that project from neurons to make synapses onto neurons in another location, to enable a signal to be sent from one region of the nervous system to another. Neurons are connected by a single axon, or by a bundle of axons known as a nerve tract, or fasciculus. Shorter<unk> s are found within grey matter in the brain, whereas longer projections, made up of myelinated axons, constitute white matter. In the hippocampus there are<unk> s involved in its circuitry including the perforant<unk> , that provides a connectional route from the entorhinal cortex to all fields of the hippocampal formation, including the dentate gyrus, all CA fields (including CA1), and the subiculum. Descending motor<unk> s of the pyramidal tracts travel from the cerebral cortex to the brainstem or lower spinal cord. Ascending sensory tracts in the dorsal column–medial lemniscus<unk>  (DCML) carry information from the periphery to the cortex of the brain.
Neural pathway
Parafunctional activity
Cardiac cycle
Functional spinal unit
Central pattern generator
Somatosensory system
Neuronal tuning
Cardiovascular physiology