Projection fiber - Wikipedia Projection fiber Projection fiber Details Identifiers Latin Fibrae projectionis NeuroNames ancil - 219 Dorlands / Elsevier f_05 / 12362087 TA A14. 1.00. 018 FMA 76745 Anatomical terms of neuroanatomy ( edit on Wikidata ) The projection fibers consist of efferent and afferent fibers uniting the cortex with the lower parts of the brain and with the spinal cord. In human neuroanatomy, bundles of axons ( nerve fibres ) called tracts, within the brain, can be categorized by their function into association fibers, projection fibers, and commissural fibers. Contents 1 Efferent 2 Afferent 3 References 4 External links Efferent The principal efferent strands are : ( 1 ) the motor tract, occupying the genu and anterior two - thirds of the occipital part of the internal capsule, and consisting of ( a ) the geniculate fibers, which decussate and end in the motor nuclei of the cranial nerves of the opposite side ; and ( b ) the cerebrospinal fibers, which are prolonged through the pyramid of the medulla oblongata into the medulla spinalis : ( 2 ) the corticopontine fibers, ending in the nuclei pontis. Afferent The chief afferent fibers are : ( 1 ) those of the lemniscus which are not interrupted in the thalamus ; ( 2 ) those of the superior cerebellar peduncle which are not interrupted in the red nucleus and thalamus ; ( 3 ) numerous fibers arising within the thalamus, and passing through its stalks to the different parts of the cortex ; ( 4 ) optic and acoustic fibers, the former passing to the occipital, the latter to the temporal lobe. References This article incorporates text in the public domain from the 20th edition of Gray 's Anatomy ( 1918 ) External links Diagram at kennedykrieger.org Nervous tissue CNS Tissue Types Grey matter White matter Projection fibers Association fiber Commissural fiber Lemniscus Funiculus Fasciculus Nerve tract Decussation Commissure Neuropil Meninges Cell Types Neuronal Pyramidal Purkinje Granule Glial insulating : Myelination : Oligodendrocyte other Astrocyte Radial glial cell Ependymal cells Tanycyte Microglia PNS General Dorsal Root Ganglion Ramus Ventral Root Ramus Ramus communicans Gray White Autonomic ganglion ( Preganglionic nerve fibers Postganglionic nerve fibers ) Connective tissues Epineurium Perineurium Endoneurium Nerve fascicle Neuroglia Myelination : Schwann cell Neurolemma Myelin incisure Node of Ranvier Internodal segment Satellite glial cell Neurons / nerve fibers Parts Soma Axon hillock Axon Telodendron Axon terminals Axoplasm Axolemma Neurofibril / neurofilament Dendrite Nissl body Dendritic spine Apical dendrite / Basal dendrite Types Bipolar Unipolar Pseudounipolar Multipolar Interneuron Renshaw Afferent nerve fiber / Sensory neuron GSA GVA SSA SVA fibers Ia or Aα Ib or Golgi or Aα II or Aβ and Aγ III or Aδ or fast pain IV or C or slow pain Efferent nerve fiber / Motor neuron GSE GVE SVE Upper motor neuron Lower motor neuron α motorneuron β motorneuron γ motorneuron Termination Synapse Electrical synapse / Gap junction Chemical synapse Synaptic vesicle Active zone Postsynaptic density Autapse Ribbon synapse Neuromuscular junction Sensory receptors Meissner 's corpuscle Merkel nerve ending Pacinian corpuscle Ruffini ending Muscle spindle Free nerve ending Nociceptor Olfactory receptor neuron Photoreceptor cell Hair cell Taste bud This neuroscience article is a stub. You can help Wikipedia by expanding it. Retrieved from `` https://en.wikipedia.org/w/index.php?title=Projection_fiber&oldid=772418798 '' Categories : Wikipedia articles incorporating text from the 20th edition of Gray 's Anatomy ( 1918 ) Cerebral white matter Neuroscience stubs Hidden categories : Medicine infobox template using GraySubject or GrayPage Medicine infobox template using Dorlands parameter All stub articles Talk Contents About Wikipedia Čeština فارسی Edit links This page was last edited on 27 March 2017, at 04 : 43. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: projection fibers in the brain mainly connect what
Answer: cortex