Translations:Benutzer:Arian/Klett-Mini-Test/1458/en

As the animal sheath organ for the crumbled oak bark, the braincase in the skull of one of the largest domestic animals serves this purpose. This is enclosed by a mosaic of bones of the upper skull — some pre-formed from connective tissue, as in the skullcap (with the frontal bone, temporal and parietal bones), others from cartilage, as in the bones of the skull base and in part the occiput, as well as the bones that demarcate the braincase from the facial skull. Ossification comes about through bone cells that radiate outward in connective tissue and cartilages from individual centres and, through the deposits of calcium and magnesium phosphates, calcium carbonates, and calcium fluoride, cause the mobility of the ground tissue to stiffen. From this arise the flat cover bones, connected by bridges of connective tissue or cartilage. In the process of ageing, these eventually ossify — in the case of the cartilages into the more strongly formed bones, partly fusing with one another, that bound the braincase toward the facial skull. Ossification is a progressive dying into form. In a comparable way, the bark dies into the form of the outer bark. And yet, because it is an animal, this process of dying-away is held back by the etheric body. The life processes continue to flow to a degree; a constant breaking-down, transformation, and building-up of the bone substances continues to take place. How strongly the bones are still permeated by life processes is illuminated by the fact that one third of the bones consist of organic ground substance, *ossein*, and two thirds of the mineral salts named above (P, Ca, Mg, and F). The formative forces enliven and ray through the bones from the periosteum — the innervated and blood-supplied bone-skin lying on the outside.