A Practical Approach, Second Edition=Ronald D. Ho.pdf

Table 6.8DescriptionComparative gestational milestones in nervous system developmentAge(d)Rat Mouse Rabbit Hamster Guinea Pig Rhesus Monkey Human ChickenRef.Age(d)Ref.Age(d)Ref.Age(d)Ref.Age(d)Ref.Age(d)Size Somites(mm)SomitesSomitesSomitesSomitesSomitesRef.Age(d)Primitive streak 9 10 8 10 7.25 10 7 10 13 10 17 10 17 10 12h 10Neural plate 9–9.5 1 1,2,4, 7 5,7–10 8 10 7.5 10 13.5 10 20 10 18–19 1–1.5 10,39 1d 109,10,18,23Elevated brainplate, neuralfolds9.5 1.5 1–4 1,2,4,9,11,18,237.75–8.251–4 27 14.5 2 56 ca19–201–2 115 23–26h 4 88Neural crest forganglia of IXand X; spinalflexuresometimespresentTrigeminal,neural crestcomponent;neural crest atlevel ofmetencephalonGanglia of VIIand VIII; neuralcrest andposterodorsalepibranchialplacode of firstpharyngealgrooveFusion ofneural folds(early)AnteriorneuroporecompletelyclosedOtic pits; opticvesicles, andauditory pitsappearBothneuroporesclosed —anterior first10 2 5–12 1,2,4,9,18,2310 2 5–12 1,2,4,9,18,2310 2 5–12 1,2,4,9,18,2310.5—10.7510.5–10.7510.5–10.7510.5–11.52.4 17 1,2,4,10,11,18,23,2711,27 8.5–9 10–149d1h11,27 8d22h18± 5,7–9,399–9.5 10,2716 39 8.5–9 10–1410,11 9–9.5 10 9.5–10.58.5 17–208.5 17–2027 8.25 12–138.5 17–2027 8.25 12–13Ref.Age(d/h)24±1 3–5 92,144 ca45–49hSize Somites(mm) aSomites44 ca.40–45h 13–1417 8844 ca 45h 15 8844 14–1510 8.5–9 10 15.25–15.515,55 22–24 2–3.5 4–12 66–68,71,73,74,79–8210,44 15.25 10 25 10 24–26 2.5–4.913–2044 20 3910 25–31 10 25–28 1010,39,71,73,83Ref.8826–28h 3–4 282.3d 10COMPARATIVE FEATURES OF VERTEBRATE EMBRYOLOGY 175© 2006 by Taylor & Francis Group, LLC