Paper - A human embryo with head-process and commencing arch enteric canal
Embryology - 24 Apr 2024    Expand to Translate
|
|---|
| Google Translate - select your language from the list shown below (this will open a new external page) |
|
العربية | català | 中文 | 中國傳統的 | français | Deutsche | עִברִית | हिंदी | bahasa Indonesia | italiano | 日本語 | 한국어 | မြန်မာ | Pilipino | Polskie | português | ਪੰਜਾਬੀ ਦੇ | Română | русский | Español | Swahili | Svensk | ไทย | Türkçe | اردو | ייִדיש | Tiếng Việt These external translations are automated and may not be accurate. (More? About Translations) |
Thompson, P., and Brash, J. C. 1923. A human embryo with head-process and commencing arch enteric canal. J. Anat., 58, 1-20. PMID 17103992
| Historic Disclaimer - information about historic embryology pages |
|---|
 |
A Human Embryo with Head-Process and Commencing Archenteric Canal
By The Late Pnornsson PETER THOMPSON, M.D.,
University of Birmingham ,' Fellow of King’s College, Londan,
AND JAMES C. BRASH, M.A., M.D., B.Sc.,
Professor of Anatomy, University of Birmingham.
- The clinical history of this embryo was detailed by the late Professor Thompson in his Ingleby Lecture before the University of Birmingham, in October, 1918. The first part of this paper, including the “General description of the Ovum,” he left in MS., and it represents all that he was able to complete for publication before his lamented death.—J. C. B.
Towards the end of the third or beginning of the fourth week, and immediately
preceding the formation of the neural groove, the human embryo passes through
a phase of development characterised by the presence of certain axial structures,
viz. the primitive streak, a head -process canalised by a rudimentary archenteric
canal, and the protochordal plate. Even to—day but few examples of this
stage are on record, and Grosser, who has published an interesting account of
a young human ovum which showed these structures with great clearness,
claims that previous to l913—the date of his own pub1ication—a similar stage
of development in man had not previously been recorded. In 1918 Ingalls
published an account of a human embryo, somewhat less advanced in development, but strikingly like the preceding in all the essentials. A third example
was recorded by Strahl in 1916, but up to the present[1] the publication does
not appear to have reached this country. Ingalls refers to it very briefly, and
states that it shows a very similar stage of development, and adds that no data
are given as to the age of the specimen.
The present paper is a further contribution to the subject, and, as far as can be ascertained, these four specimens comprise the material which illustrates a phase of development in the human embryo which falls somewhere between that represented by the ova of Fetzer, Von Herff and Beneke on the one hand, and that represented by the ova of Frassi and Eternod and Graf Spee’s Gle on the other. Estimating the age from the stage of development, Grosser gives 18 days, which is perhaps not far out. This archenteric stage, if such a term may be used for convenience, appears to be quite a transient one, and this may account for the small number of specimens which up to the present have been described.
The stage appears to correspond very closely with that which Wilson and Hill have described in their well-known work on monotreme development as the “post-gastrular stage.” They point out that this stage “includes the de-
2 Peter Thompson and James 0. Brush
velopment, from the primitive knot, of the so-called ‘head-process’ together with various other phenomena associated with this, either causally or con- temporaneously. This phase of development is deserving of special recogni- tion,” they say, “as constituting a new era, for, with its onset, the process of ‘notogenesis’ is initiated, and the proper axis of the future embryo (Minot’s ‘primitive axis’) is laid down.” A full description of the axial structures in our embryo will be given at a later stage. In the first place it will be more convenient to set forth the details of the clinical history, which have been obtained with great care and are practically complete.
CLINICAL HISTORY, ETC.
The ovum was removed from the uterus of a married lady by Mr Beckwith Whitehouse, F.R.C.S., on account of the serious condition of the patient’s health. It came into my hands on the following day, intact, and enclosed within a capsule of decidua. The following notes taken by Mr Whitehouse accompanied the specimen.
The patient, Mrs X, was seen in consultation on December 3rd, 1917. She was of a neurotic and highly sensitive disposition, and had suffered from nephroptosis, for which she had consulted a surgeon a short time previously with a view to an operation for its relief. Pregnancy, however, had super- vened, and this fact, together with the knowledge of the pending operation, produced an exacerbation of the mental symptoms, and suicidal tendencies were exhibited. After full consultation it was decided to explore the cavity of the uterus and terminate pregnancy if such really existed.
The catamenial history had previously been quite regular—menstrual cycle 28 days. The last period began on October 25, 1917, and ended on November 1. No menstrual period occurred as expected on November 22. The husband, who had been away from home, returned on November 2, and coitus took place on the evening of November 6. Mr X left Birmingham on the morning of November 7, and no further coitus occurred. (The coitus previous to that of the evening of November 6 took place some time before October 23, the day on which the husband left on a business journey for South Wales, but how long before is uncertain. That no coitus took place between these two dates, i.e. October 23 and November 6, forces us to the conclusion that a previous cohabitation may be definitely rejected as a possible factor in the case.)
Three days later, i.e. on November 9, the patient complained of pains in the breast, and thought that she was pregnant.
On December 3, upon examination under an anaesthetic, the body of the uterus was found to be somewhat globular in shape and Very slightly enlarged. No softening of the cervix or other sign of pregnancy was present. However, taking into consideration the very slight increase in size of the organ, it was
thought that a pregnancy might be present, and the uterine cavity was explored at 4.30 p.m.
Cite this page: Hill, M.A. (2024, April 24) Embryology Paper - A human embryo with head-process and commencing arch enteric canal. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Paper_-_A_human_embryo_with_head-process_and_commencing_arch_enteric_canal
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
- ↑ This was written in l920.—J. C. B.
