About the spinal cord, which description are correct（）
A. It lies in vertebral canal
B. It continuous with pons at level of foramen magnum
C. It has cervical and lumbosacral enlargement
D. It can be divided into 33 segments
E. The gray matter lies in the center
查看答案
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
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
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