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ANAT 2626 Pharyngeal Arches and Pharyngeal Pouches (Mercy Navis)

ANAT 2626 Pharyngeal Arches and Pharyngeal Pouches (Mercy Navis)

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1 Pharyngeal Arches and Pharyngeal Pouches Pharyngeal arches 1. these begin to develop early in the 4 th week of development as neural crest cells , in the future head and neck regions 2. the mesodermal bars that appear in the developing neck of the fetus are called the pharyngeal or bronchial arches 3. by the end of the 4 th week, four well - defined pairs of pharyngeal arches are visible 4. six arches develop, but the 5 th one disappears 5. a) the 1 st and 2 nd arches are larger and overlap the other arches b) the first pair of arches are primordium of the jaws 6. the 5 th and 6 th arches are rudimentary and are not visible on the surface of the embryo 7. the arches are separated from each other by prominent clefts called pharyngeal grooves First pharyngeal arch ( Mandibular arch ) 1. develops two promineces a) the smaller maxillary prominence gives rise to 1. maxilla bone ( upper jaw ) 2. zygomatic bone 3. squamous part of the temporal bone 2. the larger mandibular prominence forms the mandible ( lower jaw ) 3. the first arch plays a major role in the development of the face The cartilage of the first arch is Meckel’s cartilage The nerve of the first arch is mandibular nerve ( branch of trigeminal nerve - 5 th cranial nerve ) Skeletal elements that develop from the first arch 1. mandible 2. incus 3. malleus Ligaments 1. sphenomandibular ligament 2.
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