from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The anterior part of the embryonic alimentary canal of a vertebrate from which the pharynx, lungs, esophagus, stomach, liver, pancreas, and duodenum develop.
- n. The first part of the alimentary canal of an arthropod or annelid, which includes the buccal cavity, esophagus, crop, and gizzard.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The anterior part of the alimentary canal of an embryo, from the mouth to the duodenum
from the GNU version of the Collaborative International Dictionary of English
- n. The anterior part of the alimentary canal, from the mouth to the intestine, or to the entrance of the bile duct.
from The Century Dictionary and Cyclopedia
- n. See gut.
Sorry, no etymologies found.
At a point about one-third of the length of the embryo from the tip of the head, the enteron opens to the yolk-sac, so that what now may be called the foregut has this considerable extent.
Her lab studies the development of the pharynx (or foregut) in the nematode C. elegans in order to better understand the formation and physiology of organs.
Based predominantly on the morphology of the carpometacarpus, some ornithologists have proposed that cariamaens are closely related to the Hoatzin* Opisthocomus hoazin**, that bizarre folivorous, arboreal bird that (uniquely among birds) practices foregut fermentation.
Fore-intestine: = foregut, q.v. Forficate: = forcipate, q.v. Forks: Trichoptera; forks of veins in apical part of wing, numbered 1, 2, 3, etc.
The foregut is here more inclosed, and the notochord, _nt_, having separated from the entoderm, _en_, is seen as a distinct layer of cells extending from the foregut to the blastopore.
Figure 4H is seventy-nine sections posterior to the last, and passes through the foregut, _ent_, just cephalad to the anterior intestinal portal and caudad to the heart.
Followed cephalad, towards the posterior intestinal portal, it gradually diminishes in caliber, as did the foregut on approaching the anterior intestinal portal.
A sagittal section of approximately this stage, shown in figure 1A, represents the foregut, _fg_, as a shallow enclosure of the anterior region of the entoderm, while the wide blastopore, _blp_, connects the region of the hindgut with the exterior.
The foregut is seen as a wide cavity, _ent_, depressed dorsally, apparently, by the formation of the medullary groove and the notochord; it is wider laterally than in a dorso-ventral direction, and its walls are made up of about three layers of closely arranged, irregular cells; the wall is somewhat thinner on the dorsal side, just below the notochord.
It is attached in front to the body-wall between the pericardium and umbilicus; behind to the body-wall at the level of the second cervical segment; laterally it is deficient where the pericardial and pleuro-peritoneal cavities communicate, while it is perforated in the middle line by the foregut.