第咽囊 第2咽囊 第3咽囊 第4咽囊 第5咽囊 branchial pouch loutpocketings of endoderm of primitive pharynx /opposed to branchial groove branchial membrane: the thin membrane between branchial groove and branchial pouch
---branchial pouch: /outpocketings of endoderm of primitive pharynx /opposed to branchial groove ---branchial membrane: the thin membrane between branchial groove and branchial pouch
2 Formation of face -five elevations / frontonasal prominence /maxillary prominence paired upper 上頜隆起 branches of first branchial arch /mandibular prominence paired lower 下颌隆起 branches of first branchial arch
2. Formation of face ---five elevations /frontonasal prominence /maxillary prominence: paired, upper branches of first branchial arch /mandibular prominence: paired, lower branches of first branchial arch
上頜隆起 鼻板 stomodeum 下頜隆起 /the depression between five elevations /opposed to primitive pharynx by buccopharyngeal membrane, will break down then stomodeum communicates with the foregut
---stomodeum /the depression between five elevations /opposed to primitive pharynx by buccopharyngeal membrane, will break down, then stomodeum communicates with the foregut
内侧鼻隆起 窝 外侧鼻隆走 nasal placode: by the 5th week, thickening of ectoderm of lower part of frontonasal prominence ---nasal pit: depressions in nasal placode median nasal prominence and lateral nasal prominence: proliferation of mesenchyme at the margins of the nasal placodes
---nasal placode: by the 5 th week, thickening of ectoderm of lower part of frontonasal prominence ---nasal pit: depressions in nasal placode ---median nasal prominence and lateral nasal prominence: proliferation of mesenchyme at the margins of the nasal placodes
by the 5th week, right and left mandibular prominences fuse to form the lower jaws and lips by the 6th week, medial nasal prominence merge to give rise to median portion of the nose, middle portion of upper lip, the philtrum
---by the 5 th week, right and left mandibular prominences fuse to form the lower jaws and lips ---by the 6 th week, medial nasal prominence merge to give rise to median portion of the nose, middle portion of upper lip, the philtrum