Pharyngeal Apparatus Wk 7 - Development of the Head and...

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Development of the Head and Neck 1 st pharyngeal arches appear by day 24 By the end of week 4, four of the arches are apparent
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Pharyngeal Apparatus Pharyngeal arches (6) The 5 th arch will be vestigial Support the walls of the pharynx Pharyngeal clefts (grooves) Pharyngeal pouches Pharyngeal membranes – where pouch meets groove endoderm of pouch + ectoderm of groove
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Stomodeum will become the mouth Separated from pharynx by oropharyngeal membrane (membrane originally closes off mouth) This membrane is bilaminar, endoderm and ectoderm – it was at one time the precordal plate The membrane will rupture by day 26
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The components of the pharyngeal arch It is originally a core of mesenchyme (mesoderm + neural crest cells) with ectoderm on its outside and endoderm on the inside.
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Structures in the pharyngeal arches aortic arch vessels cartilaginous rods muscular components nerves
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Pharyngeal Grooves Five grooves between the pharyngeal arches
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Pharyngeal Apparatus Wk 7 - Development of the Head and...

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