scholarly journals Early development of the facial nerve in human embryos at stages 13–15

2015 ◽  
Vol 74 (2) ◽  
pp. 252-257 ◽  
Author(s):  
M. Weglowski ◽  
W. Woźniak ◽  
A. Piotrowski ◽  
M. Bruska ◽  
J. Weglowska ◽  
...  
Keyword(s):  
Facial Nerve ◽  
Early Development ◽  
Human Embryos

Comparison of implantation and early development of human embryos fertilized in vitro versus in vivo using transvaginal ultrasound.

1991 ◽  
Vol 10 (1) ◽  
pp. 31-35 ◽  
Author(s):  
A Pellicer ◽  
C Calatayud ◽  
F Miro ◽  
R M Castellvi ◽  
A Ruiz ◽  
...  
Keyword(s):  
Early Development ◽  
Transvaginal Ultrasound ◽  
Human Embryos

Early development of the facial nerve in the chick embryo with special reference to the development of the chorda tympani

1988 ◽  
Vol 182 (2) ◽  
pp. 169-182 ◽  
Author(s):  
Shigeru Kuratani ◽  
Shigenori Tanaka ◽  
Yuji Ishikawa ◽  
Chosei Zukeran
Keyword(s):  
Chick Embryo ◽  
Facial Nerve ◽  
Special Reference ◽  
Early Development ◽  
Chorda Tympani

scholarly journals XIII. The early development of the pericardium, diaphragm, and great veins

1888 ◽  
Vol 179 ◽  
pp. 365-384 ◽  
Keyword(s):  
Early Development ◽  
Early Period ◽  
Human Embryos ◽  
Exact Nature ◽  
Lateral Extension ◽  
Mammalian Heart ◽  
Development Proceeds

The following investigation was begun three years ago with a view to inquire into the development of the pericardium, but it transpired that this question is inseparable from that of the development of the heart, great veins, and diaphragm. Since the Avian pericardium is complicated by various septa whose exact nature is not generally agreed upon, the embryos of Mammals, especially of Rabbits, have been used for the investigation, and Human embryos have been obtained to illustrate some of the later stages. But, as the embryo of the Rabbit is capricious in its development, it is hardly possible to say upon any particular day after impregnation what stage the embryos may have attained. As a rule, the various members of a litter differ amongst themselves, some being more advanced than others; so that, without this qualification, it would be misleading to specify, as some authors have done, the exact age of the embryo described or depicted. The origin of the Mammalian heart has been elucidated by various observers, especially by Balfour, Hensen His, and Kolliker, and only requires to be mentioned so far as it bears upon the present inquiry. In the Rabbit the organ begins to develop during the first half of the eighth day. And its commencement is indicated by a slight bending of the splanchnopleure into the widely separated halves of the cœlom (fig. 1, lit.). This loop is thicker than the rest of the splanchnopleure, owing to multiplication and elongation of its cells. A t this time the portion of the coelom into which the cardiac loops project is more capacious than the rest, but has not the same lateral extension. Its somatopleure, after running a little way outwards, turns abruptly ventral wards to join the splanchnopleure. At the foremost end of the rudimentary heart, where the bending of the somatopleure is greatest, both membranes disassociate themselves at an early period from the peripheral uncleft mesoblast; but further back they retain their original connexions. The accompanying drawing was made from a section which was slightly oblique, and illustrates both of these points (fig. 1). Afterwards, as development proceeds, the whole of the cardiocephalic region ultimately frees itself in this way from the peripheral uncleft mesoblast.

XXVI.—Observations on the Early Development of the Human Embryo

1925 ◽  
Vol 53 (3) ◽  
pp. 533-567 ◽  
Author(s):  
Thomas H. Bryce
Keyword(s):  
Early Development ◽  
Human Embryo ◽  
Early Period ◽  
Paraxial Mesoderm ◽  
Human Embryos ◽  
Early Stages ◽  
Normal Human ◽  
The Individual

This memoir is based upon the study of three normal human embryos belonging to the period of development preceding the cleavage of the paraxial mesoderm into the primitive segments, as well as of certain abnormal specimens of the same early period which have yielded valuable corroborative data, but will not be described in detail. Well-preserved specimens belonging to these early stages are very rare, and our knowledge has been, and can only be, built up from the detailed descriptions of isolated cases by the individual observers into whose hands they happen to fall.

Early Development of the Nose in Human Embryos: A Stereomicroscopic and Histologic Analysis

2004 ◽  
Vol 114 (10) ◽  
pp. 1791-1800 ◽  
Author(s):  
Chang-Hoon Kim ◽  
Hyoung Woo Park ◽  
Kyubo Kim ◽  
Joo-Heon Yoon
Keyword(s):  
Early Development ◽  
Human Embryos ◽  
Histologic Analysis

The Early Development of the Larynx in Staged Human Embryos

1973 ◽  
Vol 82 (7_suppl) ◽  
pp. 3-27 ◽  
Author(s):  
John A. Tucker
Keyword(s):  
Early Development ◽  
Respiratory System ◽  
Left Lung ◽  
Staging System ◽  
Human Embryos ◽  
The Future ◽  
The Right

More than 15 serially sectioned human embryos from stage 8 to stage 15 were examined, together with relevant reconstructions and photographs. Their lengths ranged from 1 to 7 mm, and their ages from 18 to 33 postovulatory days. The necessity of employing a recognized staging system is stressed. The foregut appears either late in stage 8 or during stage 9. The median pharyngeal groove that appears during stage 9 presages the first indication of the respiratory system and includes the future larynx. The laryngotracheal sulcus begins to be circumscribed at stage 10 and a caudal expansion represents the pulmonary primordium. The tracheoesophageal septum appears at stage 12. The right and left lung buds become definite by stage 13. The hypopharyngeal eminence, arytenoid swellings, and epithelial lamina of the larynx are detectable at stage 14. Vestibulotracheal and pharyngotracheal canals are distinguishable at stage 15. Hence, from the first appearance of the foregut at about 19 days, the larynx has developed into a recognizable organ two weeks later, namely, by 33 days.

Three-Dimensional Development of the Facial Nerve Path through the Ear Region in Human Embryos

1994 ◽  
Vol 103 (5) ◽  
pp. 395-403 ◽  
Author(s):  
Raymond F. Gasser ◽  
Shuntaro Shigihara ◽  
Kazuyuki Shimada
Keyword(s):  
Facial Nerve ◽  
Three Dimensional ◽  
Human Embryos ◽  
Geniculate Ganglion ◽  
External Ear ◽  
Two Dimensional ◽  
Horizontal Segment ◽  
Ear Development ◽  
Definitive Arrangement

The goal was to determine how the facial nerve path forms normally through the ear region. Five three-dimensional computer reconstructions and eight wax plate—graphic, two-dimensional reconstructions were made from a group of 47 serially sectioned human embryos that were in the blastemal period of ear development, when most of the definitive arrangement is established. The size, shape, and positional changes of the facial nerve relative to the external ear and notochord were studied in both lateral and frontal views. The vertical (dorsoventral) position of the external ear region remains constant but shifts caudally. After formation, the geniculate ganglion assumes a position that gradually becomes rostrodorsal to the external ear. Facial nerve branches form and grow into regions expanding peripherally. The superficial petrosal branch appears to hold the ganglion in position as the horizontal segment of the facial nerve forms when the external ear shifts caudally. Possible growth movements explaining abnormal nerve paths are discussed.

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