foregut

(redirected from foreguts)
Also found in: Dictionary, Medical.

foregut

[′fȯr ‚gət]
(embryology)
The anterior alimentary canal in a vertebrate embryo, including those parts which will develop into the pharynx, esophagus, stomach, and anterior intestine.
References in periodicals archive ?
1990), Wolfe and Felgenhauer (1991), Mikami and Takashima (1993) and Lemmens and Knott (1994), in which substantial morphological changes occurred in the digestive system during metamorphosis by the reduction of mandibles and the number of setae in the mouthpart appendages and poorly developed foreguts.
The present study supplies morphological descriptions of foreguts of larvae and post-larvae of three species belonging to the infra-order of Pleocyemata, Callicurus major (Say, 1818) (Thalassinidea) and Sesarma rectum Randall, 1840 (Brachyura) and Dendrobranchiata, Litopennaeus vannamei (Boone, 1931) (Penaeidea).
When foreguts were only partially full, well-digested remains of prey frequently could be identified by pieces of shell or opercula, mandibles (for shrimp), or chela tips and carapace fragments (for crabs) (Elner et al.
trivittatus and the Atlantic jackknife clam (Ensis directus), increased in occurrence in foreguts with increasing crab size.
It is doubtful if digestion occurs maximally at night as reported by Modder (1983) since no significant difference was observed in the store of the foregut content of nymphs with and without food overnight collected at 6 a.
f-Degrees of Freedom Figures in bracket indicate the percentage growth rate TABLE 2 Mean scores of foregut content of Zonocerus nymphs with and without food Time Foregutcontent With Without Food 6 AM 1.
Not surprisingly, longer fish had larger fore- and hindgut masses, but they also had lower %P and higher C:P ratios in their foreguts.
Rank order correlations suggested a linear association between the N contents in foreguts and hindguts, but evaluation of the different scenarios in Fig.
Small wonder, considering that even the tiniest known mammal with a foregut -- the muntjac, or toy deer, of Southeast Asia -- weighs more than five times as much as the roughly 1.
But Strahl and his collaborators suggest that the hoatzin's foregut, a prerequisite for digesting its leafy diet, may reflect an evolutionary tradeoff that accounts for many of its other peculiarities, including a sedentary lifestyle.
Although the daytime sample was small, 50% of the crabs had empty foreguts (Fig.
When describing the diet of portunid crabs, Williams (1981) recommended including only individuals with foreguts more than 50% full (i.