Sentences with word «branchial»
The study, published this week in Development, demonstrates striking similarities in the genetic mechanism used to pattern gill arch appendages (called branchial rays) and fins / limbs.
sciencedaily.com
Larval fish can exchange ions through their skin, and early fish likely used rudimentary gill structures known as branchial baskets.
The study, published this week in Development, demonstrates striking similarities in the genetic mechanism used to pattern gill - arch appendages (called branchial rays) and fins / limbs.
Remarkably, he found that Sonic hedgehog's role in branchial rays closely parallels its role in the limb: it sets up the axis of development and, later, maintains growth of the limb skeleton.
«The shared role of Sonic hedgehog in patterning branchial rays and limbs may be due to a deep evolutionary relationship between the two,» Gillis says, «or it may simply be that two unrelated appendages independently use the same gene for the same function.»
Ongoing studies comparing the function of other genes during branchial ray and fin / limb development will help to resolve this.
Infected branchial cleft cyst due to Bordetella bronchiseptica in an immunocompetent patient.
The gill arches and branchial rays sit on either side of the head, below the eyes.
«Branchial rays will figure prominently in the story of the evolutionary origin of vertebrate animal appendages, either by shedding light on the evolutionary antecedent of paired fins / limbs, or by teaching us about the genetic mechanisms that animals can use to invent new appendages,» Gillis says.
The dental mesenchyme, which is the origin of all the five tooth stem cell types, is known to derive from the cranial neural crest (CNC) during their embryonic development within the branchial arch 1 (BA1) region (i.e., head mesenchyme).
The mass, known as a branchial remnant cyst, was a congenital abnormality arising from an embryonic structure called the third branchial arch.
While most cranial mediastinal masses are usually thymoma or lymphosarcoma, other causes may include ectopic thyroid tissue, branchial cyst, chemodectoma, or thoracic wall tumor.