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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 shape has also been likened to that of a butterfly. The grey matter also has a histologically visible central canal running through it.

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 shape has also been likened to that of a butterfly. The grey matter also has a histologically visible central canal running through it. 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. Please see [[Spinal_Cord_-_Anatomy_%26_Physiology#Sensory_Pathways|sensory pathways]] for further information on the composition of nerve fibres within the spinal cord. The relative size of the grey matter is dependant on the number of motor cells related to controlling limbs and therefore the size varies along the length of the spine. Around the areas of the fore and hindlimbs the grey matter is considerably larger.

[[Image:WIKIVETspinalcord1.jpg|thumb|centre|250px|Spinal Cord - © John Bredl]]

[[Image:WIKIVETspinalcord1.jpg|thumb|centre|250px|Spinal Cord - © John Bredl]]

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