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).
The ectoderm forms outer parts of the body such as skin, hair, eyes, mammary glands and the spinal cord. When a part of the ectoderm folds inward, the neural tube grows in the embryo to create the central nervous system, parts of the face and the brain, according to Arizona State University. The endoderm creates major organs such as the liver, pancreas, lungs and thyroid.