Anterior (ventral) median fissure Central canal Posterior (dorsal) median sulcus

Question

Anterior (ventral) median fissure Central canal Posterior (dorsal) median sulcus Posterior gray horn . Lateral gray horrn Anterior gray horn Gray commissure Posterior funiculus (posterior white columns) Lateral funiculus (lateral white columns) Anterior funiculus (anterior white columns) White commissure Answer the following questions regarding these features of the spinal cord. What is in the central canal? . What makes white matter white in color? .Why is gray matter gray in color? Are cell bodies and synapses more likely to be in white or gray matter? . Are axons more likely to be in white matter or gray matter? . Sensory information entering the spinal cord from spinal nerves will be found in which horn? Motor information leaving the spinal cord to reach spinal nerves will be found in which horns? Will sensory information be travelling up the spinal cord or down it? The pathways (tracts) that carry sensory information are called: . Will motor information be travelling up the spinal cord or down it? .Will sensory and motor information in the above-named pathways (tracts) be travelling . Will short interneurons that communicate across (anterior/posterior, not up/down) the The pathways (tracts) that carry motor information are called: in white matter or gray matter? spinal cord be in white matter or gray matter? 113

Explanation / Answer

41.Central canal is a canal that runs longitudinally across entire length of spinal cord.It is filled with cerebrospinal fluid and is continous with the ventricular system of the brain.

2.Myelin sheaths which cover axon of the neurons ,give a white appears to the brain tissue.Wherever large number of myelinated axons are present,that region is called white matter.

3.Grey matter consists of mostly soma of neurons,unmyelinated axons,dendrites and synapses.Because all these are not covered with myelin sheath they appear grey in colour and constitute grey matter of the brain.

4.Cell bodies and synapses are not covered by myelin sheath ,so most likely to be grey in colour.

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