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 cells migrate inward at the blastopore, which forms, or is close to, the location of the anus in the adult. the ectoderm forms the outer tube of the embryo. the endoderm is an inner tube that forms the alimentary canal and all its derivative organs. the mesoderm lies between these two layers. the head, which contains the genetic material and is capped by the acrosome (cap) at the apex that contains enzymes needed for the sperm to penetrate the egg. - the middle piece contains the primary power source of mitochondria that fuel the movements of the tail piece.