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branchial arch

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branchial arch

n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

branchial arch

Embryology
See Pharyngeal arch.

Zoology
One of a number of bony or cartilaginous arches which support gills on either side of the throat of fishes and amphibians.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

pha·ryn·ge·al arch

(făr-in'jē-ăl ahrch)
Typically, there are six arches in embryos of vertebrates; in the lower vertebrates, they bear gills; in the higher vertebrates (e.g., human embryos), they appear transiently and give rise to specialized structures in the head and neck.
Synonym(s): branchial arch.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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References in periodicals archive
Few studies had been done to determine whether all of the gill arches play an equal part in gaseous exchange or whether more of the respiratory current passes over some gill arches than others.
Among a high number of morphological and osteological characters, they also used the morphology of rakers and teeth, the number of gill rakers and teeth and the number of rows of the rakers on gill arches as well as the rows of teeth on tooth plates.
The gill rakers are located on the concave internal side of the gill arches. Grossly, each gill arch has two rows of rakers; small lateral and slightly larger medial rakers (Figs.
melanoptents, with approximately 1100 denticles per c[m.sup.2] in the oral cavity and up to about 1600 denticles per c[m.sup.2] on the gill arches. Pharyngeal pads exist on the fifth gill bar only, and no ridged edges are present.
What we call the skull in humans was formed from a combination of the primitive brain case (chondrocranium), the sensory capsules and their underlying supports, components of the visceral skeleton (gill arches and their derivatives), and the overlying dermal bones (dermatocranium).
The present investigation carried out basically with ecological indexes was aimed to study the monthly colonization of the various gill arches of Oreochromis niloticus (Linne, 1758) by four monopisthocotylea monogenean species.
The gills of the most external gill arches were removed, always on the right-hand side of the fish.
We determined rates of metacercarial infection for each fish by removing the four left gill arches. Gill arches were examined with a dissecting microscope to enumerate and identify the developmental stage of all enclosed metacercariae.
After infections, fish were killed and gill arches isolated into chilled phosphate-buffered saline (PBS) awaiting analysis of gill infection intensity using a stereomicroscope (Zeiss, SteREO Lumar .V12).
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