The skeleton (from Greek σκελετός, skeletós “dried up”) is the body part that forms the supporting structure of an organism. There are several different skeletal types: the exoskeleton, which is the stable outer shell of an organism, the endoskeleton, which forms the support structure inside the body, the hydroskeleton, and the cytoskeleton.
Types of skeletons
There are two major types of skeletons: solid and fluid. Solid skeletons can be internal, called an endoskeleton, or external, called an exoskeleton, and may be further classified as pliant (elastic/movable) or rigid (hard/non-movable). Fluid skeletons are always internal.
Exoskeletons are external, and are found in many invertebrates; they enclose and protect the soft tissues and organs of the body. Some kinds of exoskeletons undergo periodic moulting as the animal grows, as is the case in many arthropods including insects and crustaceans.
The exoskeleton of insects is not only a protection but also serves as a surface for muscle attachment, as a watertight protection against drying and as a sense organ to interact with their environments. The shell of mollusks also performs all of the same functions, except that in most cases it does not contain sense organs.
An external skeleton can be quite heavy in relation to the overall mass of an animal, so on land, organisms that have an exoskeleton are mostly relatively small. Somewhat larger aquatic animals can support an exoskeleton because weight is less of a consideration underwater. The southern giant clam, a species of extremely large saltwater clam in the Pacific Ocean, has a shell that is massive in both size and weight. Syrinx aruanus is a species of sea snail with a very large shell.
The endoskeleton is the internal support structure of an animal, composed of mineralized tissue and is typical of vertebrates. Endoskeletons vary in complexity from functioning purely for support (as in the case of sponges), to serving as an attachment site for muscles and a mechanism for transmitting muscular forces. A true endoskeleton is derived from mesodermal tissue. Such a skeleton is present in echinoderms and chordates.
Skeletor (/ˈskɛlᵻtɔːr/) is a fictional character and the primary antagonist of the Masters of the Universe franchise created by Mattel. He is the archenemy of He-Man. Depicted as a muscular blue humanoid with a purple hood over his yellowing bare-bone skull, Skeletor seeks to conquer Castle Grayskull so he can obtain its ancient secrets, which would make him unstoppable and enable him to conquer and rule the fictional world of Eternia. However, the incompetence of his henchmen is always an issue to achieving his ambitions.
In the 2002 series, Skeletor was once a man named Keldor whose face was accidentally splashed with a corrosive liquid. He survived, but at the cost of his face.
Mineternia: The Pre-Filmation Mini-comics
The first minicomics that accompanied the 1981–1983 line of Masters of the Universe toys presented the earliest version of continuity, and showed many differences from the more widely known continuity of the later cartoon made by Filmation, and the later minicomics which complemented it. He-Man was depicted as the scarcely superhuman champion of a tribe of stone-age jungle-dwellers. There was no royal court of Eternia, King Randor, Queen Marlena, or Prince Adam yet.
These very first mini-comics, which were actually more like storybooks, with a single image per page footed by prose, stated that Skeletor was originally an inhabitant of another dimension, populated with others of “his kind.” During “The Great Wars,” an ambiguous concept which is largely ignored in later continuities, a hole was opened in the dimensional wall and Skeletor was thrown from his world into Eternia. Significantly different from the lonelier and entirely self-serving Skeletor of later depictions, the villain’s key motivation in this first story is to reopen the rift between his world and Eternia, thus allowing Skeletor’s race to invade and conquer Eternia alongside him. This was the initially stated reason behind Skeletor’s desire to obtain the powers of Castle Grayskull, not merely seeking power for its own sake as is generally the case in later depictions. However, as this first incarnation of the franchise’s continuity was particularly short-lived, many questions about this version of Skeletor’s origin are left unanswered.
Filmation He-Man and the Masters of the Universe (1983)
In the 1980s cartoon series, Skeletor is a former pupil of Hordak, leader of the Evil Horde. When Hordak and his Horde invaded Eternia and stormed the palace, Hordak broke in and kidnapped one of the King and Queen’s twin babies. Queen Marlena, Man-At-Arms and the Royal Guard captured Hordak’s apprentice, Skeletor, and forced him to divulge the whereabouts of his master, who had retreated to his base of operations, Snake Mountain. When cornered, Hordak opened up a random dimensional portal (later revealed to have led to Etheria) and leaped through with the baby Princess Adora in his possession. Skeletor remained on Eternia, raised an army of powerful minions of his own and took over as ruler of Snake Mountain. Skeletor’s main goal is to conquer the mysterious fortress of Castle Grayskull, from which He-Man draws his powers. If he succeeds, Skeletor would be able to conquer not only Eternia, but the whole universe. At the same time, his other goal is to take revenge on Hordak and overthrow Horde Prime in his bid to conquer the universe.
Skeletor appeared in 71 of the 130 episodes of the 1980s He-Man cartoon (33 episodes in the first season, 38 in the second). While he was occasionally seen as a bumbling figure whose plans were always foiled by He-Man and his friends, his intentions to conquer Eternia were taken seriously by He-Man. He-Man regarded Skeletor as his arch-foe, and Skeletor’s plans were sometimes ruined through the fault of his minions rather than by his own incompetence.
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