Answer;
-Cervical enlargement
Explanation;
-The spinal cord has an obvious enlargement in the cervical region, called the cervical enlargement, where the cell bodies controlling the upper limbs arise.
-It is a spindle-shaped swelling of the spinal cord that extends from the third cervical to the second thoracic vertebra, with maximum thickness opposite the fifth or sixth cervical vertebra, consequential to the innervation of the upper limb.