EMBRYOLOGY
PHARYNGEAL ARCHES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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branchial grooves
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branchial arches
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branchial pouches
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branchial grooves, pouches and arches
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Detailed explanation-1: -Pharyngeal pouches form on the endodermal side between the arches, and pharyngeal grooves (or clefts) form from the lateral ectodermal surface of the neck region to separate the arches. In fish the pouches line up with the clefts, and these thin segments become gills.
Detailed explanation-2: -The pharyngeal arches are separated from each other by fissures called pharyngeal grooves/clefts. They are numbered in craniocaudal sequence. Each pharyngeal arch consists of a core of mesenchyme. Is covered externally by ectoderm and internally by endoderm.
Detailed explanation-3: -The pouches separate the arches on the internal (endodermal) surface whilst the clefts separate the arches on the external (ectodermal) surface.