Innervation of sheath cells of an insect sensillum by a bipolar type II neuron

1980 ◽  
Vol 58 (7) ◽  
pp. 1264-1276
Author(s):  
R. Y. Zacharuk
Keyword(s):  
Epidermal Cells ◽  
Type Ii ◽  
Outer Sheath ◽  
Bipolar Type ◽  
Dendritic Branches ◽  
Insect Sensillum ◽  
Dense Vesicles ◽  
Chemical Mediators ◽  
Type Ii Neuron ◽  
Sheath Cells

A multiterminal bipolar type II neuron is situated centrally in each mandible of an elaterid larva. It is ensheathed by a glial cell to the base of the two terminal scolopophorous sensilla in the terminal mandibular tooth but its terminal branches are naked. These branches extend along the outer surfaces of the inner and outer sheath cells of and the adjacent surfaces of the epidermal cells around both sensilla. The dendrite and its branches contain longitudinal microtubules, peripheral mitochondria, and clear and variously dense vesicles. It has no ciliary region. The dense vesicles are more numerous in newly molted than in intermolt larvae. Unique plates of endoplasmic reticulum and vesiculating bodies occur in the sheath and epidermal cells adjacent to the naked dendritic branches. This neuron may control the secretory activities of the sensillar sheath cells and adjacent epidermal cells through release of appropriate chemical mediators.

Fine structure of sensilla on the ovipositor of the tephritid fly Urophora affinis

1986 ◽  
Vol 64 (4) ◽  
pp. 973-984 ◽  
Author(s):  
R. Y. Zacharuk ◽  
R. M. K. W. Lee ◽  
D. E. Berube
Keyword(s):  
Fine Structure ◽  
Epidermal Cell ◽  
Fruit Flies ◽  
Sheath Cell ◽  
Outer Sheath ◽  
Dendritic Segment ◽  
Tubular Body ◽  
Tubular Bodies ◽  
Sheath Cells

There are four types of sensilla on the ovipositor blade of Urophora affinis Frauenfeld, one more than was observed on three other species of fruit flies studied by other authors. Three of the types, uniporous gustatory pegs, campaniform organs, and tactile short hairs are common to the four species and generally are in similar positions on the blade. The fourth, uniporous gustatory plates, were noted in U. affinis only. The chemosensilla are innervated by three chemosensory dendrites that terminate below the pore and a mechanosensory dendrite with a tubular body that is attached to a basal cuticular apodeme of the covering cuticle. The dendritic tubular bodies of the campaniform organs and tactile hairs terminate parallel to the surface in a right-angular bend, where they are attached to basal apodemes of the covering cuticle. The chemosensilla and tactile hairs have individual outer and inner sheath cells, but the campaniform organs have individual inner sheath cells only. The part of the ciliary dendritic segment that is encased by the dendritic sheath passes through an epidermal cell, often with several sensilla sharing the same epidermal cell in place of an outer sheath cell. The role of these sensilla during oviposition is discussed.

Input to Type-II Neuron from the Labyrinths

1972 ◽  
pp. 193-194
Author(s):  
G. Melvill Jones ◽  
H. Shimazu ◽  
C.H. Markham
Keyword(s):  
Type Ii ◽  
Type Ii Neuron

Viruslike particles in cells associated with sensilla in head appendages of a dytiscid beetle

1992 ◽  
Vol 70 (1) ◽  
pp. 67-70 ◽  
Author(s):  
R. Y. Zacharuk ◽  
E. S. Leung ◽  
J. C. Jensen
Keyword(s):  
Glial Cells ◽  
Physiological Stress ◽  
Dense Core ◽  
Type I ◽  
Type Ii ◽  
Icosahedral Clusters ◽  
Dense Shell ◽  
Bipolar Type ◽  
Viruslike Particles ◽  
Diving Beetle

Two types of viruslike particles (VLP) were noted in the cytoplasm of cells associated with sensilla on the antennae and labial palps of the diving beetle Graphoderus occidentalis Horn. The most common "hollow" particle was 30–32 nm in diameter with an electron-dense shell about 8 nm thick and, in some cases, a dense core granule about 5.6 nm in diameter. These VLP were always tightly packed in orderly arrays in apparently icosahedral clusters. Such clusters occurred in the perikarya of multiterminal type II neurons and glial cells in the labial nerves, bipolar type I neurons and inner sheath cells of mechano- and chemo-sensilla on both appendages, adjacent epidermal cells, and an axon from an antennal sensillum. A second type of VLP was dense-cored and about 22 nm in diameter. This type was scattered individually or in loose, unordered clusters in a type I sensillar neuron. Both VLP types were closely associated with ribosomes. Some minor cytopathic changes in the contents of cells containing VLP, and the occurrence of VLP as manifestations of physiological stress rather than as infective virions, are discussed.

Fine structure of aesthetasc chemoreceptors in the crayfish Orconectes propinquus

1986 ◽  
Vol 64 (2) ◽  
pp. 392-399 ◽  
Author(s):  
Ann Jane Tierney ◽  
C. S. Thompson ◽  
D. W. Dunham
Keyword(s):  
Distal Portion ◽  
Main Body ◽  
Decapod Crustaceans ◽  
Orconectes Propinquus ◽  
Outer Sheath ◽  
Apical Pore ◽  
Cell Layers ◽  
Chemical Stimuli ◽  
Sensory Endings ◽  
Sheath Cells

The outer antennular flagella of decapod crustaceans bear chemoreceptive hairs called aesthetascs. In the crayfish Orconectes propinquus these sensilla are located ventrally on the 11–13 most distal segments of the outer flagella. Two clumps of 3–6 aesthetascs occur on each segment, giving a total of approximately 80 aesthetascs per outer flagellum. Aesthetascs are100–150 μm long and about 12 μm in diameter. Each has a single annulation 30 μm from the hair base. The sensilla arise from immovable sockets and are directed distally at a 45° angle to the main body of the antennule. Aesthetascs lack an apical pore. However, the distal portion of each sensillum has thin cuticular walls which are readily penetrated by dye; this is probably the site where chemical stimuli enter. In O. propinquus each aesthetasc is innervated by 40–110 sensory neurons. Each neuron gives rise to a dendrite that branches into two cilia (9 × 2 + 2 structure; 0.15–0.20 μm in diameter). No further branching of outer dendritic segments occurs and thus each aesthetasc contains 80–220 sensory endings. Within the antennule lumen the dendrites are surrounded by two sheath cell layers, an inner layer and an outer layer. The inner sheath cells ascend 50 μm into the aesthetasc lumen; the outer sheath cells terminate at the sensilla bases. The outer dendritic segments gradually taper in diameter and terminate 25 μm from the sensilla tips.

scholarly journals Scaling law for the transient behavior of type-II neuron models

2007 ◽  
Vol 75 (2) ◽  
Author(s):  
M. A. D. Roa ◽  
M. Copelli ◽  
O. Kinouchi ◽  
N. Caticha
Keyword(s):  
Scaling Law ◽  
Transient Behavior ◽  
Type Ii ◽  
Neuron Models ◽  
Type Ii Neuron

scholarly journals Regulation of Actin-Dependent Cytoplasmic Motility by Type II Phytochrome Occurs within Seconds in Vallisneria gigantea Epidermal Cells

2003 ◽  
Vol 15 (2) ◽  
pp. 331-345 ◽  
Author(s):  
Shingo Takagi ◽  
Sam-Geun Kong ◽  
Yoshinobu Mineyuki ◽  
Masaki Furuya
Keyword(s):  
Epidermal Cells ◽  
Type Ii
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