Propriospinal Tracts

	Propriospinal Tracts Propriospinal tracts are three tracts, collections of nerve fibers ascending, descending, crossed and uncrossed, that interconnect various levels of the spinal cord. They are located in the white columns ( funiculi) of the spinal cord where the columns meet the spinal central gray. Shorter fibers are located closer and longer fibers further from the gray. The tracts include the ventral propriospinal tract, the lateral propriospinal tract and the dorsal propriospinal tract. Some authors include the semilunar tract in this category. A few other fibers intrinsic to the cord run in the dorsolateral fasciculus ''Fasciculus vesanus'' is an extinct species of stem-group ctenophores known from the Burgess Shale of British Columbia, Canada. It is dated to and belongs to middle Cambrian strata. The species is remarkable for its two sets of long and sho ... of the spinal cord and the septomarginal tract. References External links * More information aBrainInfo Spinal cord trac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Nerve Tract A nerve tract is a bundle of nerve fibers (axons) connecting Nucleus (neuroanatomy), nuclei of the central nervous system. In the peripheral nervous system, this is known as a nerve fascicle, and has associated nervous tissue, connective tissue. The main nerve tracts in the central nervous system are of three types: association fibers, commissural fibers, and projection fibers. A nerve tract may also be referred to as a commissure, decussation, or neural pathway. A commissure connects the two cerebral hemispheres at the same levels, while a decussation connects at different levels (crosses obliquely). Types The nerve fibers in the central nervous system can be categorized into three groups on the basis of their course and connections. Different tracts may also be referred to as ''projections'' or ''radiations'' such as thalamocortical radiations. Association fibers The tracts that connect cortical areas within the same hemisphere are called Association fiber, association tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Nerve Fiber An axon (from Greek ἄξων ''áxōn'', axis) or nerve fiber (or nerve fibre: see spelling differences) is a long, slender projection of a nerve cell, or neuron, in vertebrates, that typically conducts electrical impulses known as action potentials away from the nerve cell body. The function of the axon is to transmit information to different neurons, muscles, and glands. In certain sensory neurons ( pseudounipolar neurons), such as those for touch and warmth, the axons are called afferent nerve fibers and the electrical impulse travels along these from the periphery to the cell body and from the cell body to the spinal cord along another branch of the same axon. Axon dysfunction can be the cause of many inherited and acquired neurological disorders that affect both the peripheral and central neurons. Nerve fibers are classed into three typesgroup A nerve fibers, group B nerve fibers, and group C nerve fibers. Groups A and B are myelinated, and group C are unmyelinated. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Spinal Cord The spinal cord is a long, thin, tubular structure made up of nervous tissue that extends from the medulla oblongata in the lower brainstem to the lumbar region of the vertebral column (backbone) of vertebrate animals. The center of the spinal cord is hollow and contains a structure called the central canal, which contains cerebrospinal fluid. The spinal cord is also covered by meninges and enclosed by the neural arches. Together, the brain and spinal cord make up the central nervous system. In humans, the spinal cord is a continuation of the brainstem and anatomically begins at the occipital bone, passing out of the foramen magnum and then enters the spinal canal at the beginning of the cervical vertebrae. The spinal cord extends down to between the first and second lumbar vertebrae, where it tapers to become the cauda equina. The enclosing bony vertebral column protects the relatively shorter spinal cord. It is around long in adult men and around long in adult women. The diam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Funiculus (neuroanatomy) A funiculus is a small bundle of axons (nerve fibres), enclosed by the perineurium. A small nerve may consist of a single funiculus, but a larger nerve will have several funiculi collected together into larger bundles known as fascicles. Fascicles are bound together in a common membrane, the epineurium. Funiculi in the spinal cord are columns of white matter. Examples include: * Anterior funiculus of the spinal cord * Lateral funiculus The most lateral of the bundles of the anterior nerve roots is generally taken as a dividing line that separates the anterolateral system into two parts. These are the anterior funiculus, between the anterior median fissure and the most lateral ... of the spinal cord * Posterior funiculus of the spinal cord See also * Funiculus separans References Neuroanatomy {{Neuroanatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Ventral Propriospinal Tract Ventral propriospinal tract is a collection of nerve fibers, ascending, descending, crossed and uncrossed, that interconnect various levels of the spinal cord. It is a component of the white anterior columns. The fibers are largely myelinated and run close to the spinal central gray for the length of the cord. Shorter fibers are closer to, longer fibers further from the gray. Other prominent components of the anterior columns are the medial longitudinal fasciculus of the spinal cord, the anterior spinothalamic tract of the spinal cord and the lateral vestibulospinal tract of the spinal cord. The ventral propriospinal tract is one of three propriospinal tracts Propriospinal tracts are three tracts, collections of nerve fibers ascending, descending, crossed and uncrossed, that interconnect various levels of the spinal cord. They are located in the white columns ( funiculi) of the spinal cord where the colu ... in which most pathways intrinsic to the spinal cord are located. The others ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lateral Propriospinal Tract Lateral propriospinal tract is a collection of nerve fibers, ascending, descending, crossed and uncrossed, that interconnect various levels of the spinal cord. Its fibers are largely myelinated. It is a component of the white lateral columns. Most prominent in the cervical and lumbar regions, it is located close to the spinal central gray. Shorter fibers are closer to, longer fibers further from the gray The tract is one of three propriospinal tracts in which most pathways intrinsic to the spinal cord are located. The others are the ventral propriospinal tract Ventral propriospinal tract is a collection of nerve fibers, ascending, descending, crossed and uncrossed, that interconnect various levels of the spinal cord. It is a component of the white anterior columns. The fibers are largely myelinated and r ... and the dorsal propriospinal tract. References External links * More information aBrainInfo Spinal cord tracts {{neuroanatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Dorsal Propriospinal Tract The dorsal propriospinal tract is a collection of nerve fibers, ascending, descending, crossed and uncrossed, that interconnect various levels of the spinal cord. It is a component of the white posterior column. Myelinated fibers are located adjacent to the spinal central gray. Shorter fibers are closer to, longer fibers further from the gray. Some fibers are unmyelinated and scattered through the posterior column. The tract is one of three propriospinal tracts in which most pathways intrinsic to the spinal cord are located. The others are the ventral propriospinal tract and the lateral propriospinal tract Lateral propriospinal tract is a collection of nerve fibers, ascending, descending, crossed and uncrossed, that interconnect various levels of the spinal cord. Its fibers are largely myelinated. It is a component of the white lateral columns. Most .... References External links * More information aBrainInfo Central nervous system pathways {{neuroanatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Fasciculus ''Fasciculus vesanus'' is an extinct species of stem-group ctenophores known from the Burgess Shale of British Columbia, Canada. It is dated to and belongs to middle Cambrian strata. The species is remarkable for its two sets of long and short comb rows, not seen in similar form elsewhere in the fossil record or among modern species. See also '' Ctenorhabdotus capulus'' '' Xanioascus canadensis'' Maotianshan shales The Maotianshan Shales () are a series of Early Cambrian sedimentary deposits in the Chiungchussu Formation or Heilinpu Formation, famous for their '' Konservat Lagerstätten'', deposits known for the exceptional preservation of fossilized orga ... ctenophores '' Maotianoascus octonarius'' '' Sinoascus paillatus'' '' Daihua sanqiong'' '' Xianguangia sinica'' References External links * Monotypic prehistoric ctenophore genera Burgess Shale animals Fossil taxa described in 1978 Cambrian genus extinctions {{Ctenophore-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]