Week 6: Difference between revisions
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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 | | [[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> | ||
[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. | ||
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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 | [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> | ||
[http://embryology.med.unsw.edu.au/Notes/nose.htm Sense - Smell] olfactory nerve fibres enter the brain | [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> | |||
[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 | |||
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Revision as of 15:30, 22 July 2010
Key Events of Human Development during the sixth week (week 6) following fertilization or Clinical week 8 (LMP).
Timeline
| 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 - gustatory papilla, caudal midline near the foramen caecum (week 6 to 7 - nerve fibers approach the lingual epithelium) | ||
| Stage 16 |  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. | |
| Stage 17 | 
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] | |
| Heart separation of common cardiac outflow (aortic arch and pulmonary aorta) |
