Our head develops from a part of the embryo called ectoderm. During the early stages of embryonic development, the embryo consists of three germ layers: the ectoderm, mesoderm, and endoderm. The ectoderm is the outermost layer and gives rise to the epidermis (skin), hair, nails, and the nervous system.

Specifically, the head and brain develop from the anterior part of the ectoderm, known as the neural plate. The neural plate undergoes a series of complex folding and differentiation processes to form the various structures of the head, including the skull, face, eyes, ears, nose, and brain.

The development of the head is intricately regulated by genetic factors, signaling molecules, and interactions with other embryonic tissues. It involves the coordinated growth, migration, and differentiation of numerous cell types to form the complex structures that make up the head and face.