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 is an external layer of germ embryo. In this form, it is in its beginning stages before developing into tissue that covers the body. It is one of the three primary germinal layers, the other layers being the mesoderm and the endoderm.The ectoderm develops the nervous system, external sensory organs as well as the hair and skin glands. The ectoderm itself consists of three separate parts: surface ectoderm, neural ectoderm and neural crest.hese cells also assist in the development of parts of the skeletal system, autonomic nervous system and hormone producing cells. This part of the ectoderm is located between the epidermis and neural tube.