Answer: look at the screenshot
The phenomenon is called an equinox. More specifically when it is September it is called the autumnal equinox ,and when it is March it is called the vernal equinox. Hope this helped!
A lighter black known as brown
The thoracic region receive sympathetic innervation from the middle and inferior cervical ganglia.
The cervical sympathetic trunk is the portion of the sympathetic trunk located to the left and right of the cervical spine, this trunk extends from the entrance of the thoracic wall to the base of the skull.
- It is made up of 3 ganglia: the superior ganglia made up of the first 3 cervical ganglia; the middle ganglia made up of the 4th cervical ganglion and the inferior ganglia made up of the last 4 ganglia.
- These ganglia are responsible for the sympathetic innervation of the upper extremities, the viscera of the thoracic cavity and that of the organs of the abdominal cavity.
Therefore, we can conclude that the thoracic sympathetic chain is made up of ganglia that innervate the thoracic region.
Learn more about the sympathetic innervation here: brainly.com/question/25711534
