2010 BGD Practical 6 - Week 6
Key Events of Human Development during the sixth week (week 6) following fertilization or Clinical week 8 (LMP).
BGD Cycle A 2010 Audio - Dr Mark Hill Monday 17th May 2010 3-5pm G2G4.
These organs mainly develop in the embryonic period and function in the fetal period.
- Thyroid - thyroid median endodermal thickening in the floor of pharynx outpouch – thyroid diverticulum (day 24) (Covered in next practical)
- Pituitary - connecting stalk between pouch and oral cavity degenerates
- Parathyroid - diverticulum elongate, hollow then solid, dorsal cell proliferation
- Thymus - diverticulum elongate, hollow then solid, ventral cell proliferation
- Adrenal - fetal cortex forms from mesothelium adjacent to dorsal mesentery, medulla neural crest cells from adjacent sympathetic ganglia
- Humans (week 5-6)
- Germ cells migrate into gonadal ridge
- Gonads (male/female) identical at this stage, Indifferent
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Detailed Week by Week
The following information is a detailed timeline of embryonic development between week 3 to 8 and content does not form part of the current practical class.
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Embryo Stages and Events
|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 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.
|Heart separation of common cardiac outflow (aortic arch and pulmonary aorta)|
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- 2010 BGD: Lecture 1 | Lecture 2 | Practical 3 | Practical 6 | Practical 12
Cite this page: Hill, M.A. (2021, July 29) Embryology 2010 BGD Practical 6 - Week 6. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/2010_BGD_Practical_6_-_Week_6
- © Dr Mark Hill 2021, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G