Furthermore, although Woltereck (1902) does not illustrate the very earliest stages of rudiment formation in Polygordius, it appears to be a circumferential invagination
(plate 9, figure 1) such that the dorsal portion of the rudiment forms from the dorsal hyposphere and the ventral portion from the ventral hyposphere; in contrast, in Owenia the entire rudiment forms from the "ventral" portion of the hyposphere lying between the mouth and anus, and only encircles the digestive tract after extensive growth and development of rudimentary organs.
25 [micro]m, which is much shorter than the longest invagination
(629 nm), measured in T.
Within the next day the blastopore closed, sealing off the primordial gut while the mouth appeared as a separate invagination
on the ventral side (Fig.
Punch biopsy from the lower back and excision biopsy from external genitalia were showed hyperkeratosis, suprabasal lacunae, corps-ronds and grains and hyperkeratotic invagination
filled with keratinous material and acantholytic cells suggestive of Darier's disease.
5 Each comedo is represented by a wide, deep invagination
of the epidermis filled with keratin.
Some consider gemination as division of single tooth germ by invagination
and subsequent development of two teeth, whereas fusion occurs when two separated tooth germs unite.
Gastrulation by invagination
(and perhaps epiboly) followed (Figs.
17) The thyroid gland, the first endocrine gland to develop embryologically, arises from an endodermal thickening of the ventral floor of the pharynx as an invagination
of the first pharyngeal pouch.
DISCUSSION: The term retrograde intussusception (invagination
) was first introduced by John Hunter to define an invagination
of the intussusceptum in an antiperistaltic or a proximal direction as opposed to the usual peristaltic or distal direction.
One is formed by the expansion of the ethmoid sinus into the frontal bone, and the other develops as a result of an independent invagination
of the middle meatus of the nasal passage.
Pedicle Screw Combined With Lateral Mass Screw Fixation in the Treatment of Basilar Invagination
and Congenital C2-C3 Fusion.
of appendicular stump in appendicectomy necessary?
The technique of appendectomy may vary from surgeon to surgeon or from centre to centre, starting from skin incision to ligation and invagination
of appendiceal stump.
Intussusception is defined as invagination
of an intestinal segment with its mesentery as a result of peristalsis into the intestinal lumen.
Sagittal reformatted images better characterized the intraluminal mass to be a retrograde invagination
of the proximal stomach into the distal esophagus (Figure 1b).