Z8600021 at 23:10, 11 August 2017

2017-08-11T23:10:50Z

← Older revision		Revision as of 10:10, 12 August 2017
Line 1:		Line 1:
	NOVEMBER 15, I924		==Early Development Of The Human Embryo==
			NOVEMBER 15, I924 NATURE p729

	~~NATURE~~		Prof, T. H. Bryce’s “ Observations” on this subject have just been published as a separate memoir in the Transactions of the Royal Society of Edinburgh (vol. 53, Part 3, 1924). They should be studied in conjunction with Prof. Teacher’s paper on the implantation of the ovum, which was recently noticed in NATURE (Sept. 6, p. 367). Indeed the two memoirs deal largely with the same material, but from different points of view, and so supplement one another. Prof. Bryce, however, besides describing the two Teacher-Bryce Ova, includes an account of an entirely new early embryo obtained by Dr. Donald M‘Intyre from a uterus removed surgically by sub total hysterectomy. The memoircontains a number of important observations, some of which are conﬁrmatory of former discoveries and some of which are new. ln dealing with the primitive extra-embryonic inesoderm, it is shown that this is primarily an angioblastic tissue. All round the young chorion the formation of vascular channels has begun in it (in the second Teacher-Bryce ovum) before there are any vessels in the yolk-sac and apart from the formation of blood corpuscles. The embryo is afterwards linked up with this system of vascular channels through vessels developed in the allantoic stalk. The author also describes the primary connexions of the yolk-sac and chorion, and points out that the observations support the view that the small size of the yolk—sac in the primates is a secondary condition, its recession being very precocious, but. agreeing essentially with what occurs at a later stage in many of the lower mammals. The yolk-sac duct, which is described, is regarded as a vestigial structure reminiscent of a phylogenetic phase when the organ was of larger size. The memoir contains also new and interesting facts relating to the amnion and its duct, the primitive streak and the archenteric canal. It is illustrated by nine plates containing nearly fifty well-executed ﬁgures.

	~~729~~


	~~EARLY DEVELOPMENT OF THE HUMAN EMBRYO.—~~

	Prof, T. H. Bryce’s “ Observations” on this subject
	have just been published as a separate memoir in the
	Transactions of the Royal Society of Edinburgh
	(vol. 53, Part 3, 1924). They should be studied in
	conjunction with Prof. Teacher’s paper on the
	implantation of the ovum, which was recently noticed
	in NATURE (Sept. 6, p. 367). Indeed the two memoirs
	deal largely with the same material, but from different
	points of view, and so supplement one another.
	Prof. Bryce, however, besides describing the two
	Teacher-Bryce Ova, includes an account of an entirely
	new early embryo obtained by Dr. Donald M‘Intyre
	from a uterus removed surgically by sub total
	hysterectomy. The memoircontains a number of
	important observations, some of which are conﬁrmatory of former discoveries and some of which are new.
	ln dealing with the primitive extra-embryonic
	inesoderm, it is shown that this is primarily an
	angioblastic tissue. All round the young chorion
	the formation of vascular channels has begun in it
	(in the second Teacher-Bryce ovum) before there are
	any vessels in the yolk-sac and apart from the
	formation of blood corpuscles. The embryo is afterwards linked up with this system of vascular channels
	through vessels developed in the allantoic stalk.
	The author also describes the primary connexions
	of the yolk-sac and chorion, and points out that the
	observations support the view that the small size
	of the yolk—sac in the primates is a secondary condition, its recession being very precocious, but. agreeing
	essentially with what occurs at a later stage in many
	of the lower mammals. The yolk-sac duct, which
	is described, is regarded as a vestigial structure
	reminiscent of a phylogenetic phase when the organ
	was of larger size. The memoir contains also new
	and interesting facts relating to the amnion and
	its duct, the primitive streak and the archenteric
	canal. It is illustrated by nine plates containing
	nearly fifty well-executed ﬁgures.

Z8600021: Created page with "NOVEMBER 15, I924 NATURE 729 EARLY DEVELOPMENT OF THE HUMAN EMBRYO.— Prof, T. H. Bryce’s “ Observations” on this subject have just been published as a separate me..."

2017-08-11T23:10:05Z

Created page with "NOVEMBER 15, I924 NATURE 729 EARLY DEVELOPMENT OF THE HUMAN EMBRYO.— Prof, T. H. Bryce’s “ Observations” on this subject have just been published as a separate me..."

New page

NOVEMBER 15, I924

NATURE

729

EARLY DEVELOPMENT OF THE HUMAN EMBRYO.—

Prof, T. H. Bryce’s “ Observations” on this subject
have just been published as a separate memoir in the
Transactions of the Royal Society of Edinburgh
(vol. 53, Part 3, 1924). They should be studied in
conjunction with Prof. Teacher’s paper on the
implantation of the ovum, which was recently noticed
in NATURE (Sept. 6, p. 367). Indeed the two memoirs
deal largely with the same material, but from different
points of view, and so supplement one another.
Prof. Bryce, however, besides describing the two
Teacher-Bryce Ova, includes an account of an entirely
new early embryo obtained by Dr. Donald M‘Intyre
from a uterus removed surgically by sub total
hysterectomy. The memoircontains a number of
important observations, some of which are conﬁrmatory of former discoveries and some of which are new.
ln dealing with the primitive extra-embryonic
inesoderm, it is shown that this is primarily an
angioblastic tissue. All round the young chorion
the formation of vascular channels has begun in it
(in the second Teacher-Bryce ovum) before there are
any vessels in the yolk-sac and apart from the
formation of blood corpuscles. The embryo is afterwards linked up with this system of vascular channels
through vessels developed in the allantoic stalk.
The author also describes the primary connexions
of the yolk-sac and chorion, and points out that the
observations support the view that the small size
of the yolk—sac in the primates is a secondary condition, its recession being very precocious, but. agreeing
essentially with what occurs at a later stage in many
of the lower mammals. The yolk-sac duct, which
is described, is regarded as a vestigial structure
reminiscent of a phylogenetic phase when the organ
was of larger size. The memoir contains also new
and interesting facts relating to the amnion and
its duct, the primitive streak and the archenteric
canal. It is illustrated by nine plates containing
nearly fifty well-executed ﬁgures.

Template talk:Ref-Bryce1924 - Revision history

Z8600021 at 23:10, 11 August 2017

Z8600021: Created page with "NOVEMBER 15, I924 NATURE 729 EARLY DEVELOPMENT OF THE HUMAN EMBRYO.— Prof, T. H. Bryce’s “ Observations” on this subject have just been published as a separate me..."