'Joints' in the Bible

As to the ram, he cut it into parts at the joints, burned the head, the internal organs, and the fat,

He does not hold on to the head, from whom the whole body, which is nourished and held together by its joints and ligaments, grows as God enables it.

For the word of God is living and active, sharper than any double-edged sword, piercing until it divides soul and spirit, joints and marrow, as it judges the thoughts and purposes of the heart.