Talk:Carnegie stage 5

Carnegie Collection

SPECIMENS OF STAGE 5a

Carnegie No. 8225

• Described briefly by Hertig and Rock (1945b).
• Hysterectomy (bicornuate uterus).
• Anterior wall of uterus.
• Chorion, 0.33 x 0.306 mm. Chorionic cavity, 0.228 x 0.2 mm. Embryonic disc, 0.09 x 0.078 mm.
• Perhaps more advanced than No. 8020 (Mazanec, 1959; Harris and Ramsey, 1966), but has also been interpreted as less advanced (Hertig, Rock, and Adams, 1956). Photomicrograph in Hertig, Rock, and Adams (1956, fig. 9).
• Presumed age, 7 days.

Carnegie No. 8020

• Described by Hertig and Rock (1945a).
• Hysterectomy.
• Posterior wall of uterus.
• Chorion, 0.45 x 0.3 mm. Chorionic cavity, 0.288 x 0.186 mm. Embryonic disc, 0.126 x 0.092 mm.
• New model of blood vessels at implantation site has been prepared (Harris and Ramsey, 1966).
• Presumed age, 7 days.

Fruhling, Ginglinger, and Gandar (1954) described briefly a specimen of about 8 days. Curettage. Early implantation. Few trophoblastic digitations. Beginning amniotic cavity. Most sections through embryonic disc lost.

(figs. 5-3 to 5-5).

Carnegie No. 8155

• Described by Hertig and Rock (1949).
• Hysterectomy.
• Anterior wall of uterus.
• Chorion, 0.306 x 0.210 mm. Chorionic cavity, 0.168 x 0.082 mm. Em- bryonic disc, 0.09 x 0.05 mm. "Tropho-epiblastic cavity" (Luckett, 1975).

(fig. 14).

SPECIMENS OF STAGE 5a

Carnegie No. 8171

• Described by Hertig and Rock (1949).
• Hysterectomy.
• Posterior wall of uterus.
• Abnormal leucocytic infiltration of endometrium. Chorion, 0.422 x 0.404 mm.
• Chorionic cavity, 0.164 x 0.138 mm. Embryonic disc, 0.114 x 0.088 mm. A cellular remnant within the umbilical vesicle, because it is probably derived from the endoderm, "may, in a sense, be regarded as an abnormal form of twin embryo" (ibid.). Presumed age, 9 days.

Carnegie No. 8215

• Described briefly by Hertig and Rock (1945c).
• Hysterectomy. Posterior wall of uterus.
• Chorion, 0.525 x 0.498 mm. Chorionic cavity, 0.228 x 0.21 mm. Em- bryonic disc, 0.084 x 0.052 mm. Lacunae perhaps further developed than in No. 8171 (Mazanec, 1959), but specimen has been "considered to be slightly younger ... because the decidual reaction is not yet apparent" (Hertig, Rock, and Adams, 1956). Photomicrographs in Hertig, Rock, andAdams (1956, figs. 15 and 17).
• Presumed age, 9 days.

Carnegie No. 8004

• Described by Hertig and Rock (1945a).
• Hysterectomy.
• Posterior wall of uterus.
• Chorion, 0.582 x 0.45 mm. Chorionic cavity, 0.312 x 0.185 mm. Embryonic disc, 0.132 x 0.1 mm.

(figs. 5-7 to 5-9).

Carnegie No. 9350

• Described briefly by Heuser (1956).
• Hysterectomy.
• At junction of posterior and anterior walls. Chorion, 0.59 x 0.58 mm. Chorionic cavity, 0.3 x 0.1 mm. Embryonic disc, 0.132 x 0.09 mm.
• Presumed age, 9 days.