- Ossicles are small calcareous elements embedded in the dermis of the body wall of echinoderms. They form part of the endoskeleton and provide rigidity and protection.了解详细信息：Ossicles are small calcareous elements embedded in the dermis of the body wall of echinoderms. They form part of the endoskeleton and provide rigidity and protection.en.wikipedia.org/wiki/Ossicle_(echinoderm)Calcareous elements, called ossicles, are buried in the connective tissue of the body wall, forming the endoskeleton.www.sciencedirect.com/topics/veterinary-science-a…
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Ossicle (echinoderm) - Wikipedia
Ossicles are small calcareous elements embedded in the dermis of the body wall of echinoderms. They form part of the endoskeleton and provide rigidity and protection. They are found in different forms and arrangements in sea urchins, starfish, brittle stars, sea cucumbers, and crinoids. The ossicles and … 展开
Ossicles are created intracellularly by specialised secretory cells known as sclerocytes in the dermis of the body wall of echinoderms. Each … 展开
Ossicles have a variety of forms including flat plates, spines, rods and crosses, and specialised compound structures including pedicellariae and paxillae.
Plates are tabular ossicles … 展开Sea urchins are covered with plates which are usually fused together to give a rigid test, but in the order Echinothurioida, the test is leathery because the plates are separate. The test is divided into five segments that extend from the apex to the mouth. Each contains two 展开
CC-BY-SA 许可证中的维基百科文本 The ultrastructure and formation of the calcareous ossicles in the …
The calcareous ossicles of the burrowing sea cucumber Leptosynapta clarki have been examined by scanning and transmission electron microscopy. The ossicles occur in the dermis of the …
The fine structure and development of calcified skeletal elements …
The calcareous ossicles and iron-rich calcified granules in the integument of sea cucumbers (Echinodermata: Holothuroida) have been examined by light and electron microscopy. Most …
Echinoderm - Radial Symmetry, Tube Feet, Spines | Britannica
- Echinoderms have a skeleton composed of numerous plates of mineral calcium carbonate (calcite). Part of the body cavity, or coelom, is a water-vascular system, consisting of fluid-filled vessels that are pushed out from the body surface as tube feet, papillae, and other structures that are used in locomotion, feeding, respiration, and sensory perce...
Ossicles - an overview | ScienceDirect Topics
Calcareous elements, called ossicles, are buried in the connective tissue of the body wall, forming the endoskeleton. Ossicles are a key feature in the taxonomic classification of holothuroids …
Morphology, shape variation and movement of skeletal …
Starfish (order: Asteroidea) possess a complex endoskeleton composed of thousands of calcareous ossicles. These ossicles are embedded in a body wall mostly consisting of a complex collagen fiber array. The combination of soft …
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Summary. The calcareous ossicles of the burrowing sea cu- cumber Leptosynapta clarki have been examined by scan- ning and transmission electron microscopy. The ossicles oc- cur in …
Echinoderms as Blueprints for Biocalcification: Regulation of ...
2011年1月1日 · Adult sea urchins have several calcified structures, including test, teeth, and spines, composed of numerous ossicles which form a three-dimensional meshwork of mineral …
The ultrastructure and formation of the calcareous ossicles in the …
The calcareous ossicles of the burrowing sea cucumber Leptosynapta clarki have been examined by scanning and transmission electron microscopy and appear to be surrounded by a syncytial …
15.9: Phylum Echinodermata - Geosciences LibreTexts
2021年1月20日 · The Phylum Echinodermata is distinguished by characteristics such as spiny-skin, pentaradial symmetry, and an endoskeleton composed of calcareous ossicles. Given that all species in this phylum are exclusively …
