Week 6: Difference between revisions
(New page: Key Events of Human Development during the sixth week (week 6) following fertilization.) |
No edit summary |
||
| Line 1: | Line 1: | ||
Key Events of Human Development during the sixth week (week 6) following fertilization. | Key Events of Human Development during the sixth week (week 6) following fertilization. | ||
== Week 6 == | |||
[[Week 6]] (Clinical Week 8) | |||
{| class="prettytable" | |||
| <center>'''Day'''</center> | |||
| <center>'''Stage'''</center> | |||
| '''Event''' | |||
|- | |||
| <center>36</center> | |||
| | |||
| [http://embryology.med.unsw.edu.au/Notes/endocrine7.htm 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/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/respire.htm 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 - descent of heart and lungs into thorax. Pleuroperitoneal foramen closes gustatory papilla, caudal midline near the foramen caecum (week 6 to 7 - nerve fibers approach the lingual epithelium) | |||
|- | |||
| <center>37</center> | |||
| Stage 16 | |||
| [[Image:CST16.gif]][http://embryology.med.unsw.edu.au/Notes/neuron.htm Neural] first parasympathetic ganglia, submandibular and ciliary, are identifiable [http://www.ncbi.nlm.nih.gov/pubmed/2751117 PMID: 2751117] | |||
[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 | |||
[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. | |||
|- | |||
| <center>38</center> | |||
| | |||
| | |||
|- | |||
| <center>39</center> | |||
| | |||
| | |||
|- | |||
| <center>40</center> | |||
| | |||
| | |||
|- | |||
| <center>41</center> | |||
| Stage 17 | |||
| [[Image:CST17.gif]] | |||
[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 [http://www.ncbi.nlm.nih.gov/pubmed/2802187 PMID: 2802187] | |||
[http://embryology.med.unsw.edu.au/Notes/nose.htm Sense - Smell] olfactory nerve fibres enter the brain [http://www.ncbi.nlm.nih.gov/pubmed/15604533 PMID: 15604533] | |||
[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 [http://www.ncbi.nlm.nih.gov/pubmed/15478101 PMID: 15478101] | |||
|- | |||
| <center>42</center> | |||
| | |||
| [http://embryology.med.unsw.edu.au/Notes/head.htm Heart] separation of common cardiac outflow (aortic arch and pulmonary aorta) | |||
|} | |||
Revision as of 11:55, 5 August 2009
Key Events of Human Development during the sixth week (week 6) following fertilization.
Week 6
Week 6 (Clinical Week 8)
| Event | ||
| 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 - descent of heart and lungs into thorax. Pleuroperitoneal foramen closes gustatory papilla, caudal midline near the foramen caecum (week 6 to 7 - nerve fibers approach the lingual epithelium) | ||
| Stage 16 | File:CST16.gifNeural first parasympathetic ganglia, submandibular and ciliary, are identifiable PMID: 2751117
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. | |
| Stage 17 | File:CST17.gif
Neural telencephalon areas of the future archicortex, paleocortex, and neocortex, visible. Beginning of future choroid plexus PMID: 2802187 Sense - Smell olfactory nerve fibres enter the brain PMID: 15604533 Neural primordium of the epidural space appears first on the ventral part of the vertebral canal and develops rostro-caudally PMID: 15478101 | |
| Heart separation of common cardiac outflow (aortic arch and pulmonary aorta) |
