| 释义 |
vestigial organ
vestigial organAn organ retained during evolution but no longer useful, e.g. the human appendix.EncyclopediaSeeOrganvestigial organ
organ [or´gan] organum.accessory digestive o's (accessory o's of digestive system) organs and structures not part of the alimentary canal that aid in digestion; they include the teeth, salivary glands, liver, gallbladder, and pancreas.organ of Corti the organ lying against the basilar membrane in the duct" >cochlear duct, containing special sensory receptors for hearing, and consisting of neuroepithelial hair cells and several types of supporting cells.effector organ a muscle or gland that contracts or secretes, respectively, in direct response to nerve impulses.enamel organ a process of epithelium forming a cap over a dental papilla and developing into the enamel.end organ end-organ.Golgi tendon organ any of the mechanoreceptors arranged in series with muscle in the tendons of mammalian muscles, being the receptor for stimuli responsible for the lengthening reaction.reproductive o's see reproductive organs, female" >reproductive organs, female and reproductive organs, male" >reproductive organs, male.sense o's (sensory o's) organs that receive stimuli that give rise to sensations, i.e., organs that translate certain forms of energy into nerve impulses that are perceived as special sensations.spiral organ organ of Corti.target organ the organ affected by a particular hormone.vestigial organ an undeveloped organ that, in the embryo or in some remote ancestor, was well developed and functional.o's of Zuckerkandl para-aortic bodies.ves·tig·i·al or·gana rudimentary structure in humans corresponding to a functional structure or organ in the lower animals.ves·tig·i·al or·gan (ves-tij'ē-ăl ōr'găn) A rudimentary structure in humans corresponding to a functional structure or organ in lower animals. vestigial organ any organ that during the course of evolution has become reduced in function and usually size. Examples include the pelvic girdle in the whale and wings in flightless birds. Often such organs have lost their original use and are used for other purposes. For example, the penguin's forelimbs are adapted for swimming.ThesaurusSeeorgan |