apparatus

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apparatus

1. a collection of instruments, machines, tools, parts, or other equipment used for a particular purpose
2. a machine having a specific function
3. Anatomy any group of organs having a specific function
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

apparatus

[‚ap·ə′rad·əs]
(science and technology)
A compound instrument designed to carry out a specific function.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
In in vitro teratogenicity studies with rat embryos, changes at the branchial apparatus were seen at 25 [micro]M for both triadimefon and triadimenol (Menegola et al.
DISCUSSION: The branchial apparatus were first described by Von Baer while its anomalies were first described by von Ascheroni.
(2,5,11,29) However, the cell rest theory proposes that cells trapped anywhere in the branchial apparatus can result in a branchial cyst later in life.
Normal branchial apparatus embryology is quite complex and beyond the scope of this manuscript.
DISCUSSION: Branchial apparatus forms during 3 rd to 7 th week of intrauterine life and contributes to many components of the head and neck region.
Third and fourth branchial apparatus anomalies are a rare cause of pediatric neck masses.
DISCUSSION: The anomalies of branchial apparatus (24%) are the second most common benign congenital masses of the neck in children after thyroglossal duct cysts (72 %).
(2,4,5) Hence, the embryologic origin of this anomaly, although related to the branchial apparatus, differs completely from that of the typical branchial cleft fistulas, as well as from that of the ectopic salivary fistulas found at the base of the neck.
Although the term branchial anomaly encompasses first, second, third and fourth branchial cleft cysts, sinuses and fistulae, all of which are distinct clinical entities and require separate management, all are thought to result from a similar embryologic error: incomplete obliteration of the branchial apparatus during embryogenesis (2).
The branchial apparatus develops between the third and seventh weeks of embryologic development.