Week 6: Difference between revisions

From Embryology
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| [http://embryology.med.unsw.edu.au/Notes/endocrine7.htm Pituitary ] Week 6 - connecting stalk between pouch and oral cavity degenerates  
| [[Endocrine_-_Pituitary_Development|Pituitary]] - Week 6 connecting stalk between pouch and oral cavity degenerates  


[http://embryology.med.unsw.edu.au/Notes/endocrine17.htm Parathyroid] Week 6 - diverticulum elongate, hollow then solid, dorsal cell proliferation  
[http://embryology.med.unsw.edu.au/Notes/endocrine17.htm Parathyroid] Week 6 - diverticulum elongate, hollow then solid, dorsal cell proliferation  
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[http://embryology.med.unsw.edu.au/Notes/endocrine13.htm Thymus] Week 6 - diverticulum elongate, hollow then solid, ventral cell proliferation  
[http://embryology.med.unsw.edu.au/Notes/endocrine13.htm Thymus] Week 6 - diverticulum elongate, hollow then solid, ventral cell proliferation  


[http://embryology.med.unsw.edu.au/Notes/endocrine9.htm Adrenal ] Week 6  - fetal cortex forms from mesothelium adjacent to dorsal mesentery, medulla neural crest cells from adjacent sympathetic ganglia  
[http://embryology.med.unsw.edu.au/Notes/endocrine9.htm Adrenal] Week 6  - fetal cortex forms from mesothelium adjacent to dorsal mesentery, medulla neural crest cells from adjacent sympathetic ganglia  


[http://embryology.med.unsw.edu.au/Notes/respire.htm Respire] Week 6 - descent of heart and lungs into thorax. Pleuroperitoneal foramen closes  
[[Respiratory_System_Development|Respire]] - Week 6 - descent of heart and lungs into thorax. Pleuroperitoneal foramen closes  


[http://embryology.med.unsw.edu.au/Notes/tongue.htm Tongue]  Week 6 - gustatory papilla, caudal midline near the foramen caecum (week 6 to 7 - nerve fibers approach the lingual epithelium)  
[http://embryology.med.unsw.edu.au/Notes/tongue.htm Tongue]  Week 6 - gustatory papilla, caudal midline near the foramen caecum (week 6 to 7 - nerve fibers approach the lingual epithelium)  
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| [[Carnegie_stage_16|Stage 16]]  
| [[Carnegie_stage_16|Stage 16]]  
| [[File:Stage16_bf1c.jpg|200px|link=Carnegie stage 16]] [http://embryology.med.unsw.edu.au/Notes/neuron.htm Neural] first parasympathetic ganglia, submandibular and ciliary, are identifiable<ref><pubmed>2751117</pubmed></ref>
| [[File:Stage16_bf1c.jpg|200px|link=Carnegie stage 16]] [[Neural_System_Development|Neural]] - first parasympathetic ganglia, submandibular and ciliary, are identifiable<ref><pubmed>2751117</pubmed></ref>


[http://embryology.med.unsw.edu.au/Notes/skmus7.htm Limbs]  upper limb bud '''nerves''' median nerve, radial nerve and ulnar nerve entered into hand plate, '''myoblasts''' spindle shaped and oriented parallel to limb bud axis.
[http://embryology.med.unsw.edu.au/Notes/skmus7.htm Limbs]  upper limb bud '''nerves''' median nerve, radial nerve and ulnar nerve entered into hand plate, '''myoblasts''' spindle shaped and oriented parallel to limb bud axis.


[http://embryology.med.unsw.edu.au/Notes/heart.htm Heart] outflow tract elliptical configuration with four cushions, the two larger fusing at this stage. Semilunar valve leaflets form at the downstream end of the cushions
[[Cardiovascular_System_Development|Heart]] - outflow tract elliptical configuration with four cushions, the two larger fusing at this stage. Semilunar valve leaflets form at the downstream end of the cushions


[http://embryology.med.unsw.edu.au/Notes/head.htm Head]  lip and palate components of the upper lip, medial nasal prominence and maxillary process present, median palatine process appears.
[http://embryology.med.unsw.edu.au/Notes/head.htm Head]  lip and palate components of the upper lip, medial nasal prominence and maxillary process present, median palatine process appears.
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| [[File:Stage17_bf1c.jpg|200px|link=Carnegie stage 17]]
| [[File:Stage17_bf1c.jpg|200px|link=Carnegie stage 17]]


[http://embryology.med.unsw.edu.au/Notes/neuron.htm Neural] telencephalon areas of the future archicortex, paleocortex, and neocortex, visible. Beginning of future choroid plexus<ref><pubmed>2802187</pubmed></ref>
[[Neural_System_Development|Neural]] - telencephalon areas of the future archicortex, paleocortex, and neocortex, visible. Beginning of future choroid plexus<ref><pubmed>2802187</pubmed></ref>


[http://embryology.med.unsw.edu.au/Notes/nose.htm Sense - Smell]  olfactory nerve fibres enter the brain<ref><pubmed>15604533</pubmed></ref>  
[http://embryology.med.unsw.edu.au/Notes/nose.htm Sense - Smell]  olfactory nerve fibres enter the brain<ref><pubmed>15604533</pubmed></ref>  
[http://embryology.med.unsw.edu.au/Notes/neuron.htm Neural] primordium of the epidural space appears first on the ventral part of the vertebral canal and develops rostro-caudally<ref><pubmed>15478101</pubmed></ref>
[[Neural_System_Development|Neural]] - primordium of the epidural space appears first on the ventral part of the vertebral canal and develops rostro-caudally<ref><pubmed>15478101</pubmed></ref>


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| [http://embryology.med.unsw.edu.au/Notes/head.htm Heart] separation of common cardiac outflow (aortic arch and pulmonary aorta)
| [[Cardiovascular_System_Development|Heart]] - separation of common cardiac outflow (aortic arch and pulmonary aorta)


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Revision as of 16:09, 22 July 2010

Key Events of Human Development during the sixth week (week 6) following fertilization or Clinical week 8 (LMP).

Embryo Week: Week 1 | Week 2 | Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8 | Week 9

Timeline

Day
Stage
 Event
36
 Pituitary - Week 6 connecting stalk between pouch and oral cavity degenerates

Parathyroid Week 6 - diverticulum elongate, hollow then solid, dorsal cell proliferation

Thymus Week 6 - diverticulum elongate, hollow then solid, ventral cell proliferation

Adrenal Week 6 - fetal cortex forms from mesothelium adjacent to dorsal mesentery, medulla neural crest cells from adjacent sympathetic ganglia

Respire - Week 6 - descent of heart and lungs into thorax. Pleuroperitoneal foramen closes

Tongue Week 6 - gustatory papilla, caudal midline near the foramen caecum (week 6 to 7 - nerve fibers approach the lingual epithelium)

37
 Stage 16 Stage16 bf1c.jpg Neural - first parasympathetic ganglia, submandibular and ciliary, are identifiable[1]

Limbs upper limb bud nerves median nerve, radial nerve and ulnar nerve entered into hand plate, myoblasts spindle shaped and oriented parallel to limb bud axis.

Heart - outflow tract elliptical configuration with four cushions, the two larger fusing at this stage. Semilunar valve leaflets form at the downstream end of the cushions

Head lip and palate components of the upper lip, medial nasal prominence and maxillary process present, median palatine process appears.

38
    
39
    
40
    
41
 Stage 17 Stage17 bf1c.jpg

Neural - telencephalon areas of the future archicortex, paleocortex, and neocortex, visible. Beginning of future choroid plexus[2]

Sense - Smell olfactory nerve fibres enter the brain[3] Neural - primordium of the epidural space appears first on the ventral part of the vertebral canal and develops rostro-caudally[4]

42
   Heart - separation of common cardiac outflow (aortic arch and pulmonary aorta)

References

  1. ↑ <pubmed>2751117</pubmed>
  2. ↑ <pubmed>2802187</pubmed>
  3. ↑ <pubmed>15604533</pubmed>
  4. ↑ <pubmed>15478101</pubmed>


Embryo Week: Week 1 | Week 2 | Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8 | Week 9

Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline

Glossary Links

Glossary: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Numbers | Symbols | Term Link

Cite this page: Hill, M.A. (2026, August 29) Embryology Week 6. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Week_6

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© Dr Mark Hill 2026, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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