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|[[File:Mark_Hill.jpg|50px|left]] This historic 1944 paper by {{Rock J.}} and Menkin describes one of the earliest clinical investigations of in ...0px|link=Embryology History - John Rock|alt=John Charles Rock|John Charles Rock (1890-1984)]]

[[File:John Rock.jpg|thumb|alt=John Charles Rock|John Charles Rock (1890-1984)]] John Charles Rock (1890-1984) was a Boston gynaecologist and human fertility researcher. In 1

His early papers were often co-authored with [[#John Rock|John Rock]] and included embryos that were incorporated into the [[Carnegie Collectio ...0px|alt=John Charles Rock|link=Embryology History - John Rock|John Charles Rock (1890-1984)]]

...rred to the publications of Hamilton (1944) and Rock and Menkin (1944) and Rock and Hertig (1948). ...s been made by the researches of Hertig and Rock (1941, 1944 and 1945) and Rock and Hertig (1942, 1944 and 1948). Other early human embryos have recently b

|[[File:Mark_Hill.jpg|50px|left]] This historic 1944 paper by {{Rock J.}} and Menkin describes one of the earliest clinical investigations of in ...ology History - Arthur Hertig#John Rock|alt=John Charles Rock|John Charles Rock (1890-1984)]]

is complete, unlike that in the 11.5 day Hertig-Rock ovum,“ and, together with the endodermal layer of the germ disc, it enclo ...er of the disc would be 0.117 mm.; that of the disc in the 11.5 day Hertig-Rock ovum is 0.138 mm. At the edge of the disc the ectodermal cells suddenly cha

...a myomatous uterus; two other ova were recovered by Pincus and Saunders.“ Rock and Hertig‘ report the recovery of an unfertilized ovum, but do not give ...Hertig and Rock,“ and more recently the account of young embryos given by Rock and Hertig,‘ the youngest human embryo was the “ Miller” described by

...n embryos at different stages of development. To Dr A. T, Hcrtig and Dr J. Rock we are indebted for photographs of early human embryos. We are especially i

...shrinkage of as much as 50 percent may occur in some instances (Menkin and Rock, 1948{{#pmid:18903892|PMID18903892}}). Whether before or after fixation, th * 2 cells Carnegie No. {{CE8260}}. Described by Menkin and Rock (1948){{#pmid:18903892|PMID18903892}}. Produced in vitro. Diameter, 153 x 1

...n my privilege to study these excellently preserved embryos. As Hertig and Rock are preparing a description of the specimens I shall refer to them only bri Hn:1t.T1G, A. 'l‘., AND J. C. ROCK 1938 On a con1p1ete normal 12-day human ovum of the p1'c~vil10us stage. Aun

...by Hoadley & Simons (1928); the nucleus was at the ‘mesophase’. Recently, Rock & Hertig (1942) report having recovered two oocytes at the first maturation ...receding one (see Knaus, 1934; Ogino, 1934; Pryde, 1941; and Smith, 1942). Rock & Hertig (1942), by comparing the ages of young embryos with the associated

...it appears to be more developed than embryo No. 7801 (13; days) of Heuser, Rock and Hertig (1945), of about the same stage as the Yale embryo (14 days) (Ra ...e human definitive yolk-sac intermediate between that described by Hertig & Rock (1941) for ovum No. 7700 (12% days) and that by Brewer (1938) for the 15-da

...n embryos at different stages of development. To Dr A. T, Hcrtig and Dr J. Rock we are indebted for photographs of early human embryos. We are especially i

...urrent" research circa 1919 in primate embryology. Describes embryo Hertig-Rock No. 1 {{CE8004}} ...umber of young human ova have recently been described - that of Hertig and Rock (about 11 days old) being the most perfect known to science. Ramsey (Yale o

...ich were secured through the cooperation of Dr. A. T. Hertig and Dr. J. C. Rock, only a brief note will be made at this time. They were obtained surgically ...obtained significance of this space and the memthrough Dr. Hertig and Dr. Rock made brane enclosing it has not yet been deit necessary to re-study the Mil

9. HERTIG, A. T., and ROCK. 1941. Two human ova of the pre—villous stage, having an ovulation age of 10. HERTIG, A. T., J. ROCK, and E. C. ADAMS. 1956. A description of 34 human ova within the first 17

...the mechanical or materialistic explanation, which is based on the solid, rock-like foundation that life phenomena can be explained as originating from ma

...s of our specimen also resemble those of the Carnegie 7801 embryo (Heuser, Rock & Hertig, 1945), except for the greater degree of histological development

...X. The ovaries were fixed in Gilson and McC'lendon. In the Barred Plymouth Rock ovary the different discharged follicles were sectioned separately and arra ...ling at the sudden release of pressure from inside. On the Barred Plymouth Rock ovary, the ripe yolk measured about 40 mm. in diameter, and the last discha

...ge of the human zygote x 500 (Reproduced by the courtesy of Drs Hertig and Rock ) ...astomeres which resulted from in vitro fertilization of human ovarian ova (Rock and Hertig, ^94^) It IS necessary, therefore, to refer to other mammalian m

...y of pregnancy, section 11-4-4. (Reprinted with permission from Hertig and Rock. Contrib. Embryol. 31: 65-84, 1945.)

...ed and, in some places, it “runs along as a layer of mesothelium” (Heuser, Rock, and Hertig, 1945). The amniotic cavity may be either smaller or larger tha ...primitive streak, the endoderm consists of large vesicular cells (Heuser, Rock, and Hertig, 1945). It should be kept in mind that, in the chick embryo, it

...or in age of [an] embryo when it is considered the same as ovulatory age" (Rock and Hertig, 1942).

The rock is traversed by numerous joints running both in a and that at a former period the volcanic rock extended considerably further than at present over the beds which are seen

...has so far been recorded in this country. It was discovered by one of us (J.H.D.) during the course of a post-mortem examination of a woman, aged 28, wh ...rtig ova of which a preliminary account only has so far appeared (Hertig & Rock, 1939). Further, it corresponds with Streeter & Wislocki's (1938) stage II

...pinion of naturalists is correct, namely, that all have descended from the rock-pigeon (Columba livia), including under this term several geographical race ...one has ever become wild or feral, though the dovecot-pigeon, which is the rock-pigeon in a very slightly altered state, has become feral in several places

...d connecting it to the duct. A similar appearance was described by Heuser, Rock & Hertig (1945) in embryo no. 7801, in which a cytoplasmic strand connects

...itutes the early phase of yolk-sac formation. In the opinion of Hertig and Rock it does not although Lewis (9) intimates that embryos of this age should ha These specimens have previously been described by Hertig and Rock (8). In the eleven day stage the membrane is well developed and sharply del

J.D. Boyd Anatomy Department, University of Cambridge ...re the investigations of Hertig and Rock since 1941 (summarized by Hertig, Rock & Adams, 1956). To a lesser extent, a number of other investigators have al

Finalism as a Rock of Offence

...ology History - Arthur Hertig#John Rock|alt=John Charles Rock|John Charles Rock (1890-1984)]] ...g|Arthur T . Hertig]], [[Embryology History - Arthur Hertig#John Rock|John Rock]] and Eleanor C. Adams

HEUSER, C., J. ROCK AND A. HERTIG 1945 Two human embryos showing early stages of the definitive

# KEMP, N. E., and Is'rocK, N. L., J. Cell Biol., 1964, 23, 49A, abstract.

To estimate the age of the embryo, Dr. Vant has followed Rock and Hertig (8), who put the ovulation date on the 14th day preceding the on

White RF. [[Embryology History - Arthur Hertig|Hertig AT.]] Rock J. and Adams E. ...logy of these specimens. I-Iertig and Rock (1941, 1945, 1949a) and Heuser, Rock, and Hertig (1945) describe briefly 8 corpora lutea associated with early p

...frog, chick, and human. B, larval form of shark; E and F, larval forms of rock fish; I and J, larval forms of frog; N and O, larval forms of chick; R, lar

...nclosure within uterine endometrium. (Redrawn and modified from Hertig and Rock, 1941, Carnegie Contr. to Embryology, vol. 29.) (B) Extra-embryonic membran ...umably begins to implant about 7 to 8 days after fertilization (Hertig and Rock, '45 ) . In doing so that pole of the blastocyst which contains the develop

...east during the development of nestling down and juvenile feathers. Barred Rock melanophores produce barreo feather patterns in White Leghorn, New Hampshir ...rom each parent. That chromosome from the female parent will have a Barred Rock factor, whereas that from the male parent will not. The Fj cock, therefore,

...than the other end. In some cases, as that of eggs laid on bare ledges of rock, this conical shape has probably had a definite natural selection value, i

...between the males of many species to attract, by singing, the females. The rock-thrush of Guiana, birds of paradise, and some others, congregate, and succe

...erm IS derived at least in part, directl) from the tropho blavt Hertig and Rock (1941) found evidence of the same condition in their 8th-i2th da> human cmb Streeter and Hertig and Rock den> homolo gjcs between the earlv tissues and structure of the primates an

...(compare- Elder, Hartman and Heuser, ’38, and Heuser, ’40; also Hertig and Rock, ’39). These are the primitive mesodermal cells. As‘ fluid accumulates

...In Discussion (pp. 1041-1042) of Hertig, A. T., Adams, E. C, McKay, D. G, Rock, J., Mulligan, W.J., and Menkin, M. F. A thirteen-day human ovum studied hi Tucker, J.A., and O'Rahilly, R. 1972. Observations on the embryology of the human lary

==Finalism as a Rock of Offence==

Fleck S Snedeker F F and Rock J (1940) Ibe comracepuic ivfc pen d a clinical ttiuK

(Rock and Hertig, 1942; Hertig and Rock, Hertig, a. T., and Rock, J. 1944. On the development of the early human ovum, with special

...material was obtained through the kindness of Drs. Arthur Hertig and John Rock of the Boston Lying—In Hospital and the Free Hospital for Women, Brooklin

...ls ; and the still fewer relevant human cases agree with these. The Hertig-Rock two-cell embryo in the Carnegie Collection was still in the tube; 10-cell a

...rimate placenta (e. g., Hill, ’32; VVislocki and Streeter, ’38; Hertig and Rock, ’41), it is clear that interest centers mainly around the topography and ...ve (’36), Jones and Brewer (’35), Brewer (’37), Johnston (’41), Hertig and Rock (’41), and Hamilton and Gladstone (’42). Thus we have attempted to pres

...-layers as always a process of disassociation or fission. That is also the rock on which were wrecked the researches of numerous other investigators, who i