The cervical enlargement（）
A. from C1 to C4 spinal cord segments
B. from C5 to C8 spinal cord segments
C. associates with the nerve roots that make up the cervical plexus
D. associates with the nerve roots that make up the brachial plexus
E. from C1 to C8 spinal cord segments
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Which are the basic components of the reflex arc（）
A. receptor
B. central nervous system
C. afferent neuron
D. efferent neuron
E. effector
The lower center of sympathetic nerve in the spinal cord locates in（）
A. Thoracic nuclei
B. Intermediolateral column
C. Sacral intermediolateral nuclei
D. Intermediolateral nuclei
E. Reticular formation
The position of the 10th thoracic segment of spinal cord is at the level of（）
A. 9th thoracic vertebra
B. 8th thoracic vertebra
C. 7th thoracic vertebra
D. 6th thoracic vertebra
E. 1st lumbar vertebra
Which one is NOT correct about the nuclei（）
A. They are in the central nervous system
B. They are collection of cell bodies which have the same functions
C. They are belong to white matter
D. They are belong to gray matter
E. They are also located in the reticular formation
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