Mesoderm

The middle of three germ layers that gives rise later in development to such tissues as muscle, bone, and blood.

Middle layer of a group of cells derived from the inner cell mass of the blastocyst; it gives rise to.bone, muscle, and connective tissue.

Middle layer of a group of cells derived from the inner cell mass of the blastocyst; it gives rise to bone, muscle, connective tissue, kidneys, and related structures.

The middle layer of the embryonic disk, which consists of a group of cells derived from the inner cell mass of the blastocyst. This middle germ layer is known as gastrulation and is the precursor to bone, muscle, and connective tissue.

The middle germ layer that forms in the early animal embryo and gives rise to parts such as bone and connective tissue.