invagination


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

invagination

 [in-vag″ĭ-na´shun]
1. the infolding of one part within another part of a structure, as of the blastula during gastrulation.
basilar invagination a developmental deformity of the occipital bone and upper end of the cervical spine in which the latter appears to have pushed the floor of the occipital bone upward; see also platybasia. Called also basilar impression.

in·vag·i·na·tion

(in-vaj'i-nā'shŭn),
1. The ensheathing, enfolding, or insertion of a structure within itself or another.
See also: introversion, intussusception.
2. The state of being invaginated.
See also: introversion, intussusception.

invagination

/in·vag·i·na·tion/ (in-vaj″ĭ-na´shun)
1. the infolding of one part within another part of a structure, as of the blastula during gastrulation.

basilar invagination  a developmental deformity of the occipital bone and upper end of the cervical spine in which the latter appears to have pushed the floor of the occipital bone upward.

invagination

(ĭn-văj′ə-nā′shən)
n.
1. The act or process of invaginating or the condition of being invaginated.
2. An invaginated organ or part.
3. Embryology The infolding of a portion of the outer layer of a blastula in the formation of a gastrula.

invagination

[invaj′ənā′shən]
Etymology: L, in, within, vagina, sheath
1 a condition in which one part of a structure telescopes into another, as the intestine during peristalsis. If the invagination is extensive or involves a tumor or polyp, it may cause an intestinal obstruction, necessitating surgery.
2 surgery for repair of a hernia by replacement of the contents of the hernial sac in the abdominal cavity. General or spinal anesthesia may be used. See also hernia, intestinal obstruction, intussusception, peristalsis. invaginate, v.

in·vag·i·na·tion

(in-vaj'i-nā'shŭn)
1. The ensheathing, enfolding, or insertion of a structure within itself or another.
2. The state of being invaginated.
See also: introversion, intussusception

invagination

A folding into or ensheathing. The process of invagination occurs in the early development of the embryo when part of the BLASTODERM folds inward so that the hollow sphere becomes cup-shaped and double-walled.

invagination

an inpushing of a layer of cells, as in GASTRULATION or in the formation of the PROCTODAEUM.

in·vag·i·na·tion

(in-vaj'i-nā'shŭn)
Ensheathing, enfolding, or insertion of a structure within itself or another.

invagination

1. the infolding of one part within another part of a structure, as of the blastula during gastrulation.
2. intussusception.
References in periodicals archive ?
E) 17-day larva; the juvenile rudiment invagination (in) has expanded to fill the hyposphere below the digestive system, and larval musculature is fully developed with dorsal levators (dl) and chaetal sac, and fully formed ciliated band system with primary ciliated band, secondary ciliated band, and lappets (la); projection of 52 confocal sections, 3-[micro]m apart.
Although vesicle densities were not measured in this study, it is possible that an increase in surface area, due to the invagination in cubomedusae, could reflect a greater synaptic efficacy than flat cnidarian synapses, which typically have few vesicles (Westfall, 1987).
the blastopore closes completely and the foregut develops as a separate invagination on the ventral side of the planuliform larva, independent of the proboscis or rhynchodeum.
Abdominal CT revealed cecum distention and cecal wall thickening, which were suggestive of inflammation in the cecum wall and ileocecal invagination (Figure 3a, b).
Intussusception is the invagination of a bowel loop with its mesenteric fold (intussusceptum) into the lumen of a contiguous portion of bowel (intussuscepiens) as a result of peristalsis.
2A), the radiation only group had swelling in mitochondria, decrease and disorder in the arrangement of cristae, decrease in number of the short and irregular microvilli, invagination in the nuclei, vesiculation in granulated endoplasmic reticulum, a transition from granulated endoplasmic reticulum to smooth endoplasmic reticulum, and enlargement within the intercellular area (Figs.
We will leverage a novel in-house high-temperature live imaging platform and proteins labeled with thermostable GFP to dissect the molecular coupling between the key processes of chromosome segregation, membrane invagination, and abscission.
Alternately, they may result from abnormal sequestration or invagination of surface ectoderm along the embryologic sites of dermal fusion that form the eyes, ears, and face.
Due to the presence of dermal invaginations, the distances from the stratum corneum to the tip of the dermal papillae and to the bottom of the invagination between the papillae, respectively, were determined separately for human skin and the vascularized skin equivalent, which is highlighted in Figure 3b.
Abdominal ultrasonography was compatible with ileocolic invagination.