Developmental anatomy of the shoot apical cell, rhizophore and root ofSelaginella uncinata

1989 ◽  
Vol 102 (3) ◽  
pp. 369-380 ◽  
Author(s):  
Ryoko Imaichi ◽  
Masahiro Kato
Keyword(s):  
Apical Cell ◽  
Developmental Anatomy

Developmental anatomy of the shoot apex of leptosporangiate ferns. II. Leaf ontogeny of Adiantum capillus-veneris (Adiantaceae)

1988 ◽  
Vol 66 (9) ◽  
pp. 1729-1733 ◽  
Author(s):  
Ryoko Imaichi
Keyword(s):  
Leaf Development ◽  
Apical Cell ◽  
Leaf Primordium ◽  
Basal Part ◽  
Basal Cells ◽  
Superficial Cell ◽  
Leaf Ontogeny ◽  
Developmental Anatomy ◽  
Adiantum Capillus Veneris ◽  
Derivatives Of

Early leaf development of Adiantum capillus-veneris L. was examined with special reference to the origin of constituent cells of the leaf. At the earliest stage of leaf development, an enlarged superficial cell (leaf initial cell) occurs in the fourth or fifth cell packet derived from the shoot apical cell and divides to form a leaf apical cell. At the same time, cells surrounding the enlarged cell, which are not derivatives of it, also divide to form the basal part of a leaf primordium. Unlike the situation in leaves of other ferns, the leaf apical cell does not divide actively during early development, while the basal cells divide frequently from the beginning. The major part of a fairly developed leaf primordium therefore consists of derivatives of the basal cells. The leaf primordium is multicellular in origin in the sense that its distal part is derived from the enlarged superficial cell and its basal part from the cells surrounding the enlarged superficial cell.

Cytoplasmic Organization in the Receptor Cells of the Crista Ampullaris

1972 ◽  
Vol 30 ◽  
pp. 60-61 ◽  
Author(s):  
Robert F. Dunn
Keyword(s):  
Fine Particles ◽  
Apical Cell ◽  
Apical Region ◽  
Receptor Cells ◽  
Cuticular Plate ◽  
Morphological Organization ◽  
Crista Ampullaris ◽  
Cytoplasmic Organization ◽  
High Degree ◽  
General Appearance

Receptor cells of the cristae in the vestibular labyrinth of the bullfrog, Rana catesbiana, show a high degree of morphological organization. Four specialized regions may be distinguished: the apical region, the supranuclear region, the paranuclear region, and the basilar region.The apical region includes a single kinocilium, approximately 40 stereocilia, and many small microvilli all projecting from the apical cell surface into the lumen of the ampulla. A cuticular plate, located at the base of the stereocilia, contains filamentous attachments of the stereocilia, and has the general appearance of a homogeneous aggregation of fine particles (Fig. 1). An accumulation of mitochondria is located within the cytoplasm basal to the cuticular plate.

Fine structure of the rectal papillae of the oriental fruuit fly, Dacus dorsalis Hendel (Tephritidae, Diptera Insecta)

1990 ◽  
Vol 48 (3) ◽  
pp. 498-499
Author(s):  
Len Wen-Yung ◽  
Mei-Jung Lin
Keyword(s):  
Fine Structure ◽  
Cell Membrane ◽  
Intercellular Space ◽  
Anterior Part ◽  
Apical Cell ◽  
Posterior Part ◽  
Apical Cell Membrane ◽  
Dacus Dorsalis ◽  
Radial Cell ◽  
Circular Base

Four cone-shaped rectal papillae locate at the anterior part of the rectum in Dacus dorsalis fly. The circular base of the papilla protrudes into the haemolymph (Fig. 1,2) and the rest cone-shaped tip (Fig. 2) inserts in the rectal lumen. The base is surrounded with the cuticle (Fig. 5). The internal structure of the rectal papilla (Fig. 3) comprises of the cortex with the columnar epithelial cells and a rod-shaped medulla. Between them, there is the infundibular space and many trabeculae connect each other. Several tracheae insert into the papilla through the top of the medulla, then run into the cortical epithelium and locate in the intercellular space. The intercellular sinuses distribute in the posterior part of the rectal papilla.The cortex of the base divides into about thirty segments. Between segments there is a radial cell (Fig. 4). Under the cuticle, the apical cell membrane of the cortical epithelium is folded into a regular border of leaflets (Fig. 5).

LIGHT AND ELECTRON MICROSCOPICAL STUDY OF THE EFFECT OF OESTROGEN ON THE CHICKEN OVIDUCT

1967 ◽  
Vol 56 (3) ◽  
pp. 391-402 ◽  
Author(s):  
H. I. Ljungkvist
Keyword(s):  
Secretory Granules ◽  
Apical Cell ◽  
Cell Types ◽  
Microscopical Study ◽  
List Type ◽  
New Production ◽  
General Increase ◽  
Chicken Oviduct ◽  
Electron Microscopical ◽  
Aortic Perfusion

ABSTRACT Oviducts from 20 one-day old chickens were used. Ten chickens were injected subcutaneously with 0.2 mg oestradiol for 5 days, the remaining ones serving as controls. The chickens were fixed by an aortic perfusion with 2.5% glutaraldehyde in phosphate buffer, pH 7.2. The treatment with oestrogen resulted in the following changes: general increase in oviduct length and thickness, differentiation of the epithelial membrane into three cell types: basal, apical and gland cells, increase in the number of cilia in the apical cell, probably due to a new production of cilia, formation of secretory granules in the vaginal epithelium as seen by light microscopy, formation of proteinlike secretory granules in the apical cell as seen by electron microscopy, increase in protein synthesis, observed as an augmentation of the endoplasmic reticulum.

Anatomy for Dental Students

2013 ◽  
Author(s):  
Martin E. Atkinson
Keyword(s):  
Clinical Practice ◽  
Dental Students ◽  
Multiple Choice Questions ◽  
Developmental Anatomy ◽  
Form And Function ◽  
Full Color ◽  
Online Resource ◽  
The Central Nervous System ◽  
And Function ◽  
Key Resources

Anatomy for Dental Students, Fourth Edition, demonstrates and explains all the anatomy needed for a modern dentistry undergraduate course. This text covers developmental anatomy, the thorax, the central nervous system, and the head and neck with an emphasis on the practical application of anatomical knowledge. This new edition has been extensively revised and updated in line with contemporary teaching and dental practice. Over 300 new full color diagrams map all the anatomical regions that dental students need to know, while the lively and accesible text guides the reader's learning. Throughout Clinical Application Boxes demonstrate how the form and function of anatomy have consequences for clinical practice. Sidelines boxes contain additional descriptions for key anatomical structures. This text is supported by an Online Resource Centre with multiple choice questions, drag and drop figure exercises, and links to key resources to help readers to consolidate and extend their knowledge of anatomy. Anatomy for Dental Students brings together anatomical structure, function, and their relationship to clinical practice, making it ideal for dental students.

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