- lumbar myotome
- lung bud
- macrodontia
- macrogenitosomia
- macroglossia
- macrostomia
- main pancreatic duct
- male gamete
- male pronucleus
- male pseudohermaphroditism
- mandibular arch
- mandibular prominence,mandibular process
- mandibulofacial dysostosis
- mantle layer
- marginal layer
- marker gene
- master gene
- maternal placenta
- matromorph
- maxillar prominence, maxillar process
- meatal plug
- Meckel cartilage
- Meckel's diverticulum
- meconium ileus
- meconium(拉)
- median cleft lip
- median nasal prominence, median nasal process
- median palatine process
- medical embryology
- medulloblast
- megalecithal ovum, polylecithal egg
- membranous atresia of anus
- membranous part of interventricular septum
- membranous septal defect
- meningocele
- meningoencephalocele
- meningohydroencephalocele
- meningomyelocele
- menstrual age
- meromelia
- mesectoderm
- mesencephalic flexure
- mesencephalon
- mesenchyme
- mesenteric hiatal hernia
- mesoderm
- mesoesophagus
- mesolecithal ovum, medialecithal egg
- mesonephric duct,Wolffian duct
- mesonephric glomerulus