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Special Embryology 2

Special Embryology 2

This presentation explains 2nd part of Special Embryology


Dr.Sherif Fahmy

August 04, 2019


  1. Derivatives of Floor of Pharynx Dr. Sherif Fahmy

  2. Forebrain bulge Pericardial bulge Stomodeum Bucco-pharyngeal membrane Pharynx Floor of

  3. Dr. Sherif Fahmy Laryngeo-trachial groove Site of developing tongue, epiglottis

    and thyroid gland in the floor of pharynx
  4. Development of Tongue (Page 17)

  5. Dr. Sherif Fahmy 2 lingual swellings Tuberculum impar Foramen ceacum

    Copula Hypobranchial eminence 1st 2nd 3rd 4th
  6. Dr. Sherif Fahmy Lingual swellings Tuberculum impar Foramen caecum Hypobranchial

  7. Lingual swelling Anterior 2/3 of tongue Hypobranchial eminence Posterior 1/3

    of tongue Foramen caecum Epiglottis Tuberculum impar
  8. A- Muscles of tongue

  9. Anomalies of Tongue 1- Aglossia: Complete absence of tongue. 2-

    Microglossia: Small sized tongue. 3- Macroglossia: Large sized tongue. 4- Bifid tongue: due to failure of fusion between 2 lingual swellings. 5- Tongue tie: short frenulum due to defective formation of linguo-gingival groove. . Dr. Sherif Fahmy
  10. Bifid tongue

  11. Tie tongue

  12. Development of Thyroid Gland (Page 19)

  13. Dr. Sherif Fahmy 2 lingual swellings Tuberculum impar Thyroid primordium

    Copula Hypobranchial eminence 1st 2nd 3rd 4th
  14. Dr. Sherif Fahmy Foramen cecum Thyroid diverticulum Developing anterior 2/3

    of tongue
  15. Dr. Sherif Fahmy Thyroglossal duct Thyroid gland Developing anterior 2/3

    of tongue Developing hyoid bone Posterior 1/3 of tongue
  16. Dr. Sherif Fahmy Foramen cecum Degenerating thyro-glossal duct Hyoid bone

    Thyroid cartilage Levator glandulae thyroidae Pyramidal lobe Lobe of thyroid gland Fate of thyroglossal duct
  17. Congenital Anomalies • Thyroid agenesis: Failure of its formation. •

    Lingual thyroid: Failure of thyroid descend. • Aberrant thyroid (Retrosternal goiter): over-descend of thyroid gland in the thorax. • Thyroglossal cyst: It is persistence of a part of the thyroglossal duct. • Thyroglossal fistula: Thyroglossal duct opens to skin. Dr. Sherif Fahmy
  18. Dr. Sherif Fahmy

  19. None
  20. Dr. Sherif Fahmy

  21. Derivatives of Caudal Part of Foregut

  22. Derivatives of Caudal Part of Foregut 1- Esophagus. 2- Stomach.

    3- Proximal ½ of duodenum. 4- Liver, gall bladder and pancreas. Dr. Sherif Fahmy
  23. Endoderm Buccopharyngeal membrane Cloacal membrane Hindgut Midgut Foregut Vitelline duct

    Allantois Definitive yolk sac L.S. in folded embryo Septum transversum
  24. Formation of Mesentry

  25. Development of Stomach (Page 29)

  26. Anatomy of Stomach

  27. Cardiac openening Pyloric opening Lesser curvature Greater omentum

  28. None
  29. Development of Stomach

  30. Pharynx Respiratory diverticulum Esophagus Stomach Septum transversum Developing liver

  31. None
  32. None
  33. Final Shape of Stomach

  34. Congenital Anomalies 1- Hypertrophic Pyloric stenosis: Congenital narrowing of pyloric

    orifice. 2- Hour glass stomach: constriction of stomach dividing it into 2 dilated parts with a narrowing inbetween. 3- Thoracic stomach: Protrusion of upper part of stomach through diaphragm due to short esophagus.
  35. None
  36. Hour glass stomach

  37. Anatomy of Duodenum

  38. None
  39. Head of pancreas Neck Body Tail Main pancreatic duct Accessory

    pancreatic duct Common bile duct Cystic duct Common hepatic duct Gall bladder Second part of duodenum 3rd part of duodenum 4th part of duodenum 1st part of duodenum Uncinate process
  40. Gall bladder Cystic duct Rt. Hepatic duct Lt. hepatic duct

    Common hepatic duct Common bile duct Main pancreatic duct Ampulla of vater
  41. Development of Duodenum (Page 31)

  42. None
  43. None
  44. Congenital Anomalies of duodenum 1- Stenosis or atresia. 2- Persistence

    of parts of mesoduodenum as duodenal folds.
  45. Duodenal folds

  46. Development of Pancreas (Page 33)

  47. None
  48. None
  49. None
  50. Duct of the distal part of dorsal pancreatic bud Anastomosis

    Duct of ventral bud Proximal part of dorsal bus Accessory pancreatic duct
  51. Anomalies of Pancreas 1- Annular pancreas: A ring of pancreatic

    tissue that surrounds the duodenum. 2- Accessory pancreas: Pancreatic tissue in abnormal site as in pyloric part of stomach or duodenum.
  52. None
  53. Development of Liver & Gall Bladder (Page 35)

  54. Formation of Gut, mesenteries & septum transversum

  55. Pericardium Septum transversum Peritoneal canals Pleura Dr. Sherif Fahmy

  56. Buccopharyngeal membrane Cloacal membrane Hindgut Midgut Foregut L.S. in folded

    embryo Heart Vitelline duct Cloaca Dr. Sherif Fahmy Septum transversum
  57. Peritoneal canals Gut Ventral mersentry (contains septum transversum cells, vitelline

    and umbilical veins Dorsal mesentry Transverse Section Dr. Sherif Fahmy
  58. Development of Liver

  59. Pars hepatica: Proliferating hepatic cords of cells. Pars cystica Hepatic

  60. Dorsal pancraetic bud Ventral pancreatic bud Hepatic bud Cystic duct

  61. None
  62. None
  63. Anomalies of Biliary System 1- Double gall bladder. 2- Bile

    duct atresia (intrahepatic or extrahepatic). 3- Absence of gall bladder. 4-Extra-hepatic duct.