Next, with regard to the self (body). The lower jaw is the former element, the upper jaw the latter, speech their union. That union takes place through speech. So much with regard to the Self. These are the great Samhitas. He who knows these Samhitas (unions), as here explained, becomes united with offspring, cattle, Vedic light, food, and with the heavenly world.

In plain words: In the body, the lower and upper jaw are joined by speech. Whoever understands these joinings is blessed with children, cattle, sacred knowledge, food and a place in heaven.