Developmental Biology 第五章四肢动物肢体的发育
Developmental Biology 第五章 四肢动物肢体的发育
Developmental biology 肢体的三个轴线 Dorsal Distat P 肱骨 humerus腕骨 carp radius als ●dgt2 ●dgt3 t40 尺骨 Fig. 10.2 The embryonic chick wing. oped at this stage but cannot be seen in The photograph shows a stained whole this type of preparation(see Fig. 10.19 mount of the wing of a chick 10 days The three developmental axes of the after laying. By this time. the main carti- limb are proximo-distal, antero-posterior aginous elements(e.g. humerus, radius, and dorso-ventral, as shown in the top and ulna) have been laid down. They panel. Note that the chick wing only has later become ossified to form bone. The three digits which have been called 2.3 muscles and tendons are also well devel- and 4 Scale bar= 1 mm
Developmental Biology 肢体的三个轴线 肱骨 尺骨 桡骨 腕骨
Fig 10. 5 The development of the chick Chick wingMousefo wing and mouse forelimb are similar The hmb cartilage elements are laid 4 days 11 days down in a proximo-distal sequence as the limb bud grows outward. The cartilage 脊椎动物肢体在 of the humerus is laid down first, followed by the radius and ulna, wrist elements and digits. Scale bar a 1 mm 结构和发育上是 4%d 11, days 保守的。 55 days 13 days 6 day 14 da 8 days 15 days 长
Developmental Biology 脊椎动物肢体在 结构和发育上是 保守的
Developmental Biology 肢芽的形成 Somites Pronephric kidney Gills 肢体区( imb field):由 有能力形成一个肢体的中 胚层细胞所组成的区域 Peribrachial Free Shoulder 肢体区细胞的特点:可 flank tissue lin imb girdle 调节性。 Figure 18.2 Prospective forelimb field of the sala mander Ambystoma maculatum. The cen- tral area contains those cells destined to form the limb per se: the cell und ing the free limb are those that give rise to the peribrachial flank tissue and the shoulder girdle. The cells outside these regions usually are not included in limbs but can form a limb if the more central tissues are extirpated
Developmental Biology 一、肢芽的形成 肢体区(limb field): 由 有能力形成一个肢体的中 胚层细胞所组成的区域。 肢体区细胞的特点：可 调节性
Developmental Biology Figure 18.3 Regulative ability of the limb field, seen when the early hindlimb fields of a hyla regula tadpole were split by numerous trematode eggs.( Courtesy of S Sess- Ions 寄生虫卵在肢芽中 的繁殖导致多肢体 的形成
Developmental Biology 寄生虫卵在肢芽中 的繁殖导致多肢体 的形成