Often, Jesus Christ (‘the Christ’ – not the historical person alone but rather an aspect of God) is considered as the ‘head’, while individual Christians make up the Church, which is the ‘body’ of Christ.
The basic analogy here is pretty simple. There is a head (‘brain’ in contemporary, secular discourse), and then there is the body.
Yet, that is not all there is to say, for if we are to push the analogy we should expect there is also a nervous system, which connects the head to the rest of the body.
It is perhaps useful to think of angels (‘messengers’) as part of the nervous system, connecting the head (God) with the rest of the body (i.e., you and me), and then various parts of the body with other parts (i.e., you and me with each other).