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Development of aorta and pulmonary trunk


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it explains the development of aorta and pulmonary trunk with simple sketch diagram.

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Development of aorta and pulmonary trunk

  1. 1. Development of aorta and pulmonary trunk To MBBS 1st year By Dr. Laxman Khanal Assistant Professor Department of anatomy BPKIHS 09-05-2016
  2. 2. Objectives 1. Should be able to list the developmental sources of arterial system. 2. Should be able to understand the origin of pharyngeal arch system. 3. Should be able to list the derivatives of pharyngeal arch arteries. 4. Should be able to explain important developmental anomalies.
  3. 3. Aorta • Ascending aorta • Arch of aorta o Rt brachiocephalic trunk o Lt common carotid artery o Lt subclavian artery • Descending aorta o Oesophageal & Bronchial o Post intercostal & subcostal o Mediastinal • Pulmonary trunk o Rt & Lt pulmonary artery Rt/Lt coronary arteries
  4. 4. Rt ventricle Lt ventricle Ascending aorta Pulmonary trunk
  5. 5. Development of arterial system Entire arterial system develops from either of two sources. 1. Pharyngeal arch arteries 2. Primitive aortas
  6. 6. ORAL PLATE Source of arterial system 1.Ventral aortas ( fuses and form aortic sac) 2.Aortic arches (five pairs of arch arteries) 3.Dorsal aortas (fused and unfused portion)
  7. 7. Maxillary artery Stapedial artery Hyoid artery
  8. 8. 7th Cervical Intersegmental artery
  9. 9. Dorsal and ventral parts of aortic sac
  10. 10. Ductus arteriosus parts obliterated • B/L carotid duct • Right dorsal aorta beyond 4th arch • Right distal part of 6th arch
  11. 11. Ventral part of aortic sac Left horn of aortic sac Left 4th arch artery Left part of dorsal aorta Fused portion of dorsal aorta
  12. 12. Aorta development • Truncus arteriosus • Aortic sac • Left horn of aortic sac • Left fourth arch artery • Unfused left dorsal aorta • Fused dorsal aorta
  13. 13. Relationship of recurrent laryngeal nerve
  14. 14. Source Derivatives Aortic sac Proximal part of arch of aorta Horns of aortic sac Right- right brachiocephalic trunk Left- part of arch of aorta 3rd arch artery Common carotid artery Internal carotid artery (+upper dorsal aorta) External carotid artery ( from arterial bud) 4th arch artery Rt- Rt subclavian (+7th cervical intersegmental artery) Lt- arch of aorta 6th arch Rt- Rt. pulmonary artery Lt- Lt pulmonary artery - Ductus arteriosus ? ? ? ? ?
  15. 15. Patent ductus arteriosus Pulmonary congestion Causes • Hypoxia • Prostaglandin E
  16. 16. Preductal • Less common • DA remain patent Postductal • More common • DA obliterated • Rib notching • Differential pressure Coarctation of aorta
  17. 17. Rib notching (radiographic sign) Due to enlargement of anastomotic channel between ant and posterior intercostal arteries.
  18. 18. Abnormal origin of Rt subclavian artery Rt 4th arch obliterates Rt dorsal aorta persists
  19. 19. Double aortic arch Rt dorsal aorta between 7th interssegmetal artery and fused dorsal aorta persists. Vascular ring • Dysphagia • Difficulty in breathing
  20. 20. Q. All are the direct branches of aorta except. a.Right brachiocephalic trunk b. left brachiocephalic trunk c. Left common carotid artery d. left subclavian artery Q. Which of the following arterial malformations is very common in premature infants? (A) Patent ductus arteriosus (B) Coarctation of the aorta (C) Abnormal right subclavian artery (D) Double aortic arch Q. Ascending aorta and pulmonary trunk are derivatives of. a. Ductus arteriosus b. Dorsal aorta c. Aortic sac d. Truncus arteriosus
  21. 21. Q. A 9-year-old boy has no pulse in the femoral artery, increased blood pressure in the arteries of the upper extremity, and enlarged intercostal veins, Which of the following abnormalities would be suspected? a. Preductal coarctation of aorta b. double aortic arch c. Postductal coarctation of aorta d. patent ductus arteriosus Q. Ductus arteriosus is the derivatives of. a. Rt 6th arch artery b. Lt 6th arch artery c. Ductus caroticus d. Lt 4th arch artery Q. Right recurrent laryngeal nerve hooks around. a. Rt subclavian artery b. Rt pulmonary artery c. Arch of aorta d. Rt brachiocephalic trunk