vestigial organ


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organ

 [or´gan]
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 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.
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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ves·tig·i·al or·gan

a rudimentary structure in humans corresponding to a functional structure or organ in the lower animals.
Farlex Partner Medical Dictionary © Farlex 2012

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Uterus must not be considered a vestigial organ after childbearing.
Jensen turns up early in the movie, like a stinking vestigial organ from Ulrik's old, wilder life.
The notion of performing a relatively minor laparoscopic procedure to remove a vestigial organ to potentially spare poorly controlled ulcerative colitis patients from proctocolectomy is highly attractive.
The reasons for patient preference for surgical management in the form of the high cost of conservative treatments, deterioration of quality of life and myths about uterus being a vestigial organ, was also evaluated (4).
DISCUSSION: Appendix is considered as vestigial organ but has been a source of surgical emergency from time unknown.
He has published over seventy peer-reviewed articles that focus mainly on dinosaur paleobiology, reptile biology, vestigial organs, and the creation-evolution debate.
Even in ultra-clean societies, then, the appendix and other vestigial organs might be unrecognized heroes.