Facet Joints. Search. Also known as zygapophyseal or apopphyseal joint, is a synovial joint between the superior articular process of one vertebra and the inferior articular process of the vertebra directly above it. There are two facet joints in each spinal motion segment.
Generally speaking, the ectoderm differentiates to form the nervous system (spine, peripheral nerves and brain), tooth enamel and the epidermis (the outer part of integument).enerally speaking, the ectoderm differentiates to form the nervous system (spine, peripheral nerves and brain), tooth enamel and the epidermis (the outer part of integument).
Triploblastic animals have ectoderm, endoderm, and mesoderm layers. All of these embryonic tissue layers will develop into all the different tissues and structures found in an adult animal. The endoderm is the innermost germ layer and develops into internal structures.The mesoderm is the middle germ layer and forms most organ systems. The ectoderm is the outer layer of an embryo and develops into the epidermis, derivatives of the epidermis, parts of the mouth and eye, and most of the nervous system.To unlock this lesson you must be a Study.com Member.erm layers are the initial tissue layers of an embryo, and animals can have up to three. 1  Ectoderm is the outermost layer of cells. 2  Mesoderm is the middle tissue layer. 3  Endoderm is the innermost germ layer.