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tongue_development

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DEVELOPMENT OF THE TONGUE.  PRESENTED BY: MIRIAM GITAHI. EVANS IHUGO. DAVID WARIUKI. ERIC WANJIKU. DEVELOPMENT OF THE TONGUE.  Appears by the end of 4TH wk as a triangular elevation in the floor of primordial pharynx.  Is the median lingual swelling, the tuberculum impar as the 1ST indication of tongue dvt.  Lateral lingual swelling dvt on the side of tuberculum impar.  Lateral lingual swelling increase in size and overgrows the tuberculum impar.  The merged lateral lingual swelling forms anterior two thirds of the tongue.  LINGUAL SEPTUM the fusion site of the lateral lingual swelling.  NB tuberculum impar do not form a recognizable part of tongue in adults.  .  The posterior third is formed from 2 elevations ,the copula from 2nd pharyngeal arches and the hypopharyngeal eminence from mesenchyme of 3rd and 4th arches.  Copula is overgrown by the eminence and disappears.  Terminal sulcus is the line of fusion btwn anterior and posterion parts of tongue.  Pharyngeal arch mesenchym forms the connective tissue and vasculature of the tongue  Tongue muscles are derived from myoblasts that migrate from the occipital myotome.  Lingual papillae appear toward the end of the 8TH week  The vallate and foliate papillae appear first,then fungiform papillae appear later near terminations of the chorda tympani branch of the facial nerve (CN VII).  The most common lingual papillae, known as filiform papillae develop ...
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