Head and neck anatomy the respiratory airway (trachea) open. Head and neck anatomy This article describes the anatomy of the head and neck of the human body, including the brain, bones, muscles, blood vessels, nerves, glands, nose, mouth, teeth, tongue, and throat. The head rests on the top part of the vertebral column, with the skull joining at C1 (the first cervical vertebra known as the atlas). The skeletal section of the head and neck forms the top part of the axial skeleton and is made up of the skull, hyoid bone, auditory ossicles, and cervical spine. The skull can be further subdivided into:
Segmentation in the human nervous system that binds cytotactin in the posterior sclerotome of the somites. These molecules exert their strong influence on the segmentation pattern by restricting the outgrowth from the region. As a matter of fact, these inhibitory chemicals expressed in the posterior sclerotome forms the basis of the segmentation pattern observed in the vertebrate nervous system. In short, the segmental arrangement of the peripheral nervous system (PNS) seen in vertebrates derives from the division of the sclerotomes into anterior and posterior parts. Segmentation in the human nervous system Segmentation is the physical characteristic by which the human body is divided into repeating subunits