Please see sensory pathways for further information on the composition of nerve fibres within the spinal cord. The ventral horns of the grey matter contain the cell bodies of motor neurones whilst the dorsal horns contain sensory neurons where the cell bodies are found in the dorsal root ganglia. The grey matter also has a histologically visible central canal running through it. The grey matter shape has also been likened to that of a butterfly. ![]() Within the spinal cord the grey matter forms an H-shape where the ventral horns of the H are broader than the dorsal horns. The grey matter is also named after its unfixed histological appearance and contains the cell bodies of neurons as well as nerve fibres. The white matter is given this name due to its appearance in unfixed histological specimens in which the white nature of the tissue is caused by the myelination of ascending and descending nerve fibres. The spinal cord is composed of two discrete parts the white matter, which is the outer part of the cord and the grey matter, which is the inner portion of the cord. This page is specifically focussed on the histologic appearance, for anatomy see Forebrain, Midbrain, Hindbrain, Cranial Nerves, Spinal Cord and CNS Development. ![]() The Central Nervous System (CNS) is composed of the brain and the spinal cord.
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