Template:Week 6 Embryo Stages and Events table

From Embryology
Revision as of 14:31, 5 April 2016 by Z8600021 (talk | contribs) (Protected "Template:Week 6 Embryo Stages and Events table" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)))
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Week 6 - Human Embryo Stages and Events (GA week 8) 
Embryo Week: Week 1 | Week 2 | Week 3 | Week 4 | Week 5 | Week 6 | Week 7 | Week 8 | Week 9
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
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.

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]

Pancreas - rotation of the developing stomach moves ventral bud dorsally and fuses with the dorsal bud.

  Heart - separation of common cardiac outflow (aortic arch and pulmonary aorta)
Note - the day timing of stages is only approximate, system names link to first page of that specific system, and events are based upon the literature cited below.
  1. <pubmed>2751117</pubmed>
  2. <pubmed>2802187</pubmed>
  3. <pubmed>15604533</pubmed>
  4. <pubmed>15478101</pubmed>