Sensory projections from dorsal and ventral appendages inDrosophila grafted to the same site are different

1985 ◽  
Vol 41 (12) ◽  
pp. 1607-1609 ◽  
Author(s):  
R. F. Stocker ◽  
H. Schmid
Keyword(s):  
Sensory Projections ◽  
Ventral Appendages

scholarly journals Cortical control of specific and nonspecific sensory projections to the cerebral cortex

1966 ◽  
Vol 4 (1) ◽  
pp. 93-94 ◽  
Author(s):  
Richard F. Thompson ◽  
Duane Denny ◽  
Hilton E. Smith
Keyword(s):  
Cerebral Cortex ◽  
Cortical Control ◽  
Sensory Projections

Development of specific muscle and cutaneous sensory projections in cultured segments of spinal cord

Development ◽  
1994 ◽  
Vol 120 (5) ◽  
pp. 1315-1323 ◽  
Author(s):  
K. Sharma ◽  
Z. Korade ◽  
E. Frank
Keyword(s):  
Spinal Cord ◽  
Dorsal Horn ◽  
Muscle Afferents ◽  
Cutaneous Afferents ◽  
In Ovo ◽  
Sensory Afferents ◽  
Chicken Embryos ◽  
Sensory Projections ◽  
Spinal Segments ◽  
Horn Development

Development of sensory projections was studied in cultured spinal segments with attached dorsal root ganglia. In spinal segments from stage 30 (E6.5) and older chicken embryos, prelabeled muscle and cutaneous afferents established appropriate projections. Cutaneous afferents terminated solely within the dorsolateral laminae, whereas some muscle afferents (presumably Ia afferents) projected ventrally towards motoneurons. Development of appropriate projections suggests that sufficient cues are preserved in spinal segments to support the formation of modality-specific sensory projections. Further, because these projections developed in the absence of muscle or skin, these results show that the continued presence of peripheral targets is not required for the formation of specific central projections after stage 29 (E6.0). Development of the dorsal horn in cultured spinal segments was assessed using the dorsal midline as a marker. In ovo, this midline structure appears at stage 29. Lack of midline formation in stage 28 and 29 cultured spinal segments suggests that the development of the dorsal horn is arrested in this preparation. This is consistent with earlier reports suggesting that dorsal horn development may be dependent on factors outside the spinal cord. Because dorsal horn development is blocked in cultured spinal segments, this preparation makes it possible to study the consequences of premature ingrowth of sensory axons into the spinal cord. In chicken embryos sensory afferents reach the spinal cord at stage 25 (E4.5) but do not arborize within the gray matter until stage 30. During this period dorsal horn cells are still being generated. In spinal segments, only those segments that have developed a midline at the time of culture support the formation of midline at the time of culture support the formation of specific sensory projections.(ABSTRACT TRUNCATED AT 250 WORDS)

Natural and experimental associations of Caenorhabditis remanei with Trachelipus rathkii and other terrestrial isopods

Nematology ◽  
1999 ◽  
Vol 1 (5) ◽  
pp. 471-475 ◽  
Author(s):  
Scott Everet Baird
Keyword(s):  
Porcellio Scaber ◽  
Terrestrial Isopods ◽  
Terrestrial Isopod ◽  
Dauer Larvae ◽  
Caenorhabditis Remanei ◽  
Ventral Appendages

AbstractCaenorhabditis remanei was found in association with the terrestrial isopod Trachelipus rathkii at several wooded locations in southwestern Ohio. These associations were as developmentally arrested dauer larvae. The sites of association were the inner surfaces of the dorsal plates and ventral appendages. C. remanei associations also were observed with Armadillidium nasatum, Cylisticus convexus, and Porcellio scaber. They were not observed with Porcellio spinicornis even though P. spinicornis populations were intermingled with infested populations of T. rathkii. Consistent with the observed natural associations, C. remanei dauers were experimentally able to infest T. rathkii and P. scaber . Dauer larvae responded to confinement with isopods by nictating and by climbing upon these potential hosts. Experimental infestations were able to persist for at least five days. Long-term infestations were not attempted. Naturliche und experimentelle Vergesellschaftungen von Caenorhabditis remanei mit Trachelipus rathkii unde anderen terrestrischen Isopoden - An mehreren waldigen Stellen im Sudwesten von Ohio wurde Caenorhabditis remani vergesellschaftet mit dem terrestrischen Isopoden Trachelipus rathkii gefunden. Diese Assoziationen waren wie in der Entwicklung gehemmte Dauerlarven. Sie wurden an den inneren Oberflachen der Dorsalplatten und der ventralen Anhange festgestellt. Vergesellschaftungen von C. remani wurden auch mit Armadillium nasutum, Cylisticus convexus und Porcellio scaber beobachtet. Nicht beobachtet wurden sie dagegen bei Porcellio spinicornis, obwohl Populationen dieser Art mit infizierten Populationen von T. rathkii vermischt vorkamen. In Ubereinstimmung mit den beobachteten naturlichen Assoziationen konnten Dauerjuvenile von C. remani auch im Versuch T. rathkii und P. scaber befallen. Die Dauerjuvenile reagierten auf das enge Zusammensein mit den Isopoden durch Nickbewegungen und Klettern auf diese potentiellen Wirte. So ein experimenteller Befall konnte fur mindestens funf Tage bestehen. Langfristiger Befall wurde nicht versucht.

Fine structure and primary sensory projections of sensilla located in the labial-palp pit organ of Helicoverpa armigera (Insecta)

2013 ◽  
Vol 353 (3) ◽  
pp. 399-408 ◽  
Author(s):  
Xin-Cheng Zhao ◽  
Qing-Bo Tang ◽  
Bente G. Berg ◽  
Yang Liu ◽  
Yan-Ru Wang ◽  
...  
Keyword(s):  
Fine Structure ◽  
Helicoverpa Armigera ◽  
Labial Palp ◽  
Pit Organ ◽  
Sensory Projections ◽  
Helicoverpa Armígera

scholarly journals Sernaphorin III can function as a selective chemorepellent to pattern sensory projections in the spinal cord

Neuron ◽  
1995 ◽  
Vol 14 (5) ◽  
pp. 949-959 ◽  
Author(s):  
Elizabeth K Messersmith ◽  
E.David Leonardo ◽  
Carla J Shatz ◽  
Marc Tessier-Lavigne ◽  
Corey S Goodman ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Sensory Projections

Sensory projections of identified coxal hair sensilla of the scorpionHeterometrus fulvipes (Scorpionidae)

1993 ◽  
Vol 18 (2) ◽  
pp. 247-259 ◽  
Author(s):  
K. Sasira Babu ◽  
K. Sreenivasulu ◽  
V. Sekhar
Keyword(s):  
Sensory Projections ◽  
Hair Sensilla

The evolutionary origin of the mammalian isocortex: Towards an integrated developmental and functional approach

2003 ◽  
Vol 26 (5) ◽  
pp. 535-552 ◽  
Author(s):  
Francisco Aboitiz ◽  
Daniver Morales ◽  
Juan Montiel
Keyword(s):  
Episodic Memory ◽  
Distinctive Feature ◽  
Functional Approach ◽  
Olfactory Cortex ◽  
Cerebral Hemispheres ◽  
Evolutionary Origin ◽  
Dorsal Cortex ◽  
Associative Networks ◽  
Selective Pressures ◽  
Sensory Projections

The isocortex is a distinctive feature of mammalian brains, which has no clear counterpart in the cerebral hemispheres of other amniotes. This paper speculates on the evolutionary processes giving rise to the isocortex. As a first step, we intend to identify what structure may be ancestral to the isocortex in the reptilian brain. Then, it is necessary to account for the transformations (developmental, connectional, and functional) of this ancestral structure, which resulted in the origin of the isocortex. One long-held perspective argues that part of the isocortex derives from the ventral pallium of reptiles, whereas another view proposes that the isocortex originated mostly from the dorsal pallium. We consider that, at this point, evidence tends to favor correspondence of the isocortex with the dorsal cortex of reptiles. In any case, the isocortex may have originated partly as a consequence of an overall “dorsalizing” effect (that is, an expansion of the territories expressing dorsal-specific genes) during pallial development. Furthermore, expansion of the dorsal pallium may have been driven by selective pressures favoring the development of associative networks between the dorsal cortex, the olfactory cortex, and the hippocampus, which participated in spatial or episodic memory in the early mammals. In this context, sensory projections that in reptiles end in the ventral pallium, are observed to terminate in the isocortex (dorsal pallium) of mammals, perhaps owing to their participation in these associative networks.

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