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Nervous system. Henricia sanguinolenta has no brain, but has a nervous system. The sea star has no capacity for planning. The nervous system has two parts. They are motor system and the sensory system which are interconnected by neurons. The motor system is responsible for movement and functioning and the sensory system is responsible for ...
The nervous system of a starfish is shown here during an analysis. - Laurent Formery Together, the data created a 3D map to determine where genes were expressed as sea stars developed and grew.
Catch connective tissue [1] [2] [3] (also called mutable collagenous tissue) is a kind of connective tissue found in echinoderms (such as starfish and sea cucumbers) which can change its mechanical properties in a few seconds or minutes through nervous control rather than by muscular means.
The crinoid nervous system is divided into three parts, with numerous connections between them. The oral or uppermost portion is the only one homologous with the nervous systems of other echinoderms. It consists of a central nerve ring surrounding the mouth, and radial nerves branching into the arms and is sensory in function.
Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea (/ ˌ æ s t ə ˈ r ɔɪ d i ə /). Common usage frequently finds these names being also applied to ophiuroids , which are correctly referred to as brittle stars or basket stars.
Underneath the epithelium is the nervous tissue, and underneath that are fibrous tissues in the form of both left and right helices which protect the sea star's muscle tissue layer. The tube feet also contain bilobed ampulla. The ampulla muscle layers in the tube feet allow for the tube feet to elongate and shorten, which allows the sea star to ...
Radial muscles run along the length of the arms and are responsible for bending the arms. The muscles of brittle stars work in a coordinated manner to produce movement. When the radial muscles contract, the arms bend. This movement is controlled by a system of nerves that runs along the arms and connects to the central nervous system. [10]
Sea stars are a species of star fish, though they aren't even really fish to begin with. According to the Smithsonian, the arms lengths on sea stars can reach up to six inches.