![]() The form that each skeletal system takes presumably represents the optimal configuration for survival. However, the exoskeletons of these invertebrates have different physical properties and morphologies. Many of the invertebrate phyla contain species that have a hard exoskeleton, including corals (Cnidaria) limpets, snails, and Nautilus (Mollusca) and scorpions, crabs, insects, and millipedes (Arthropoda). See also: Bone Cartilage Muscle Muscular system Vertebrata ![]() Invertebrate skeletons, however, show far more variation in position, morphology, and materials used to construct them. 1), but most also have components that are exoskeletal in origin. All vertebrate animals possess an endoskeleton ( Fig. If they occur deep within the body, they form an endoskeleton. When these tissues are located external to the soft parts, the animal is said to have an exoskeleton. Skeletons can be divided into two main types based on the relative position of the skeletal tissues. The skeletal system, often termed skeleton, encompasses the anatomical structures composed of bone and cartilage, or a combination of both, which provide a framework for the body and serve as attachment for muscles. The supporting tissues of an animal that serve to protect the body, or parts of it, and play an important role in physiology. Adaptations have been made for walking and running, speed, power, digging and burrowing, locomotion without limbs (as in snakes), and aerial and aquatic locomotion. The skeletal system has adapted to the needs of many different types of organisms. The vertebrate skeletal system consists of the axial skeleton (skull, vertebral column, and associated structures) and the appendicular skeleton (limbs or appendages). The various structural components of the human skeleton include collagen, three different types of cartilage, and a variety of bone types. If the skeletal tissues occur deep within the body, as in all vertebrates, they form an endoskeleton. When the skeletal tissues are located external to the soft parts of an animal's body, the animal is said to have an exoskeleton. The skeleton is composed of bone and cartilage, or a combination of both, which provide a framework for the body and serve as attachment for muscles. It does not store any personal data.The skeletal system, or skeleton, comprises an animal's supporting tissues, serving to protect the body, or parts of it, and playing an important role in physiology. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The cookie is used to store the user consent for the cookies in the category "Performance". This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. The other twelve bones are in pairs, which gives the face its symmetry. The mandible (jawbone) and vomer are the only bones in the face which are unpaired. A large oval hole called the foramen magum allows the spinal cord to pass up into the skull. The Occipital bone forms the back of the skull and the base of the cranium. The Sphenoid bone has contact with all the other cranial bones. There are 2 Sphenoid bones, each situated behind the eyes at the base of the skull in front of the Temporals. The name derives from the Greek ethnos meaning sieve and divides the nasal cavity from the brain. The Ethmoid bone differs from the other bones in the cranium in that it is a spongy bone as opposed to a hard bone. The temporal bones are crucial in the anatomy of the ear. ![]() There are two Temporal bones in the cranium, each supporting part of the face known as the temple. There are two parietal bones which are roughly the shape of a curved rectangle. The Parietal bones form the largest part of the top and sides of the cranium. ![]() The front of the top of the head roughly covers the frontal lobes of the brain. It comprises the forehead (squama frontalis) and the upper orbit of the eye (pars orbitalis). The Frontal bone is one of the major cranial bones. ![]() The following make up the Cranium: Frontal bone The anatomy of the skull comprises the Cranium and Facial bones. ![]()
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