ANAT 1502 Pharyngeal Apparatus - Development of the Head...

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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 Monday, July 12, 2010
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Fig. 11-3 A; pg 155 Monday, July 12, 2010
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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 – endoderm of pouch + ectoderm of groove Monday, July 12, 2010
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Stomodeum will become the mouth Separated from pharynx by oropharyngeal membrane This membrane is bilaminar, endoderm and ectoderm – it was at one time the precordal plate The membrane will rupture by day 26 Monday, July 12, 2010
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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. Monday, July 12, 2010
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Structures in the pharyngeal arches aortic arch vessels cartilaginous rods muscular components • nerves Monday, July 12, 2010
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Fig. 11-3 C; pg 155 Monday, July 12, 2010
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Table 11-1; pg. 157 Monday, July 12, 2010
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Fig 11-7; pg. 159 Monday, July 12, 2010
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Fig. 11 – 5; pg. 157 Monday, July 12, 2010
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