Lamprey Motor Nerves

Cross references:   Amphioxus Motor Nerves    Lamprey Muscles    
Lamprey Fast-Slow Twitch    Lamprey Sensory Nerves   


I noticed that many of the references cited "Grillner" as a source, so I searched for him. 
Searching PubMed for "Grillner" (without an initial)  found 511 references: 

NOTE:  It turns out that there are at least two "Grillners"; "Grillner L" and "Grillner S".  It's "Grillner S" in whom I am interested.  "Grillner L" is somebody else. 
    Searching PubMed for "Grillner S"  found 365 references:


1966    365<365 
A descending pathway with monosynaptic action on flexor motoneurones. 
No abstract available      Similar articles    


1966    364<365  
No abstract available.     Similar articles  


1967    363<365   
No abstract available.        Similar articles


1968     361<365   
No abstract available.        Similar articles  


1968   360<365    
No abstract available.        Similar articles  


1968    358<365      
No abstract available        Similar articles     


1969    355<365    
No abstract available.        Similar articles  


1970    352<365    
No abstract available.           Similar articles


1971      348<365    
No abstract available.      Similar articles  

 
1971      346<365      
No abstract available.          Similar articles   


1972     345<365   
No abstract available.        Similar articles    


1973     342<365  
No abstract available.      Similar articles       


1974     341<365   
No abstract available.        Similar articles 


1975      337<365   
No abstract available    Similar articles  


No abstract available.        Similar articles


1977    20<20    
 
        Free PMC Article           Similar articles  
    My comment
    "reticulospinalneurones" are motor, not sensory.           


1994    11<20 
5-HT innervation of reticulospinal neurons and other brainstem structures in lamprey.
     Similar articles   


2008    6<20 
      Free Article         Similar articles   

Abstract

    Two forms of undulatory locomotion in the lamprey (a lower vertebrate) have been described earlier: fast forward swimming (FFS) used for long distance migrations and slow backward swimming (SBS) used for escape from adverse tactile stimuli. In the present study, we describe another form of escape behavior: slow forward swimming (SFS). We characterize the kinematic and electromyographic patterns of SFS and compare them with SBS and FFS.  

    The most striking feature of SFS is nonuniformity of shape and speed of the locomotor waves propagating along the body: close to the site of stimulation, the waves slow down and the body curvature increases several-fold due to enhanced muscle activity. Lesions of afferents showed that sensory information critical for elicitation of SFS is transmitted through the dorsal roots. In contrast, sensory signals that induce SBS are transmitted through the dorsal roots, lateral line nerves, and trigeminal nerves. Persistence of SFS and SBS after different lesions of the spinal cord suggests that the ascending and descending pathways, necessary for induction of SBS and SFS, are dispersed over the cross section of the spinal cord. As shown previously, during FFS (but not SBS) the lamprey maintains the dorsal-side-up body orientation due to vestibular postural reflexes. In this study we have found that the orientation control is absent during SFS.    

    The role of the spinal cord and the brain stem in generation of different forms of undulatory locomotion is discussed.





09-28-18 
    NOTE:  For the moment I'm going to switch my attention to




473. Central generation of locomotion in the spinal dogfish. Grillner S, Perret C, Zangger P. Brain Res. 1976 Jun 11;109(2):255-69.
1976   
3. Central generation of locomotion in the spinal dogfish. Grillner S, Perret C, Zangger P. Brain Res. 1976 Jun 11;109(2):255-69.


1966   511<511     
A descending pathway with monosynaptic action on flexor motoneurones.   
    Grillner S, Lund S.
No abstract available, but:     
    92 Similar articles
https://www.ncbi.nlm.nih.gov/pubmed?linkname=pubmed_pubmed&from_uid=5961677


1966  510<511 
Monosynaptic excitation of spinal gamma-motoneurones from the brain stem.
    Grillner S, Hongo T, Lund S.   
No abstract available, but:   
    284 Similar articles




473. Central generation of locomotion in the spinal dogfish. Grillner S, Perret C, Zangger P. Brain Res. 1976 Jun 11;109(2):255-69.


1979   
A study of the morphology of the large reticulospinal neurons of the lamprey ammocoete by intracellular injection of Procion yellow.  
http://www.ncbi.nlm.nih.gov/pubmed/85471   
    "47 reticulospinal neurons of the lamprey brain-stem were stained by intracellular injection of Procion yellow, so that their morphology and dendro-architecture could be determined. The vagal, bulbar, Mauthner, isthmic and mesencephalic groups could be distinguished by the shape and size of their somata and the distribution of their dendrites. However, they shared the following features: the somata of all these cells were relatively large (up to 80 micrometer largest diameter); the dendrites were extensively distributed in the brain-stem in an open-field arrangement; the initial segment expanded abruptly at the soma junction but tapered gradually to form a narrow axon, which joined the medial longitudinal fasciculus in the brain-stem."  
My comment
    "The vagal, bulbar, Mauthner, isthmic and mesencephalic groups could be distinguished by the shape and size of their somata and the distribution of their dendrites."  This is the first time I've encountered any mention of identifiable "groups"  of reticulospinal neurons. 
    108 Related citations:  
http://www.ncbi.nlm.nih.gov/pubmed?linkname=pubmed_pubmed&from_uid=85471            
     and one Cited by. 


Development and organization of the descending serotonergic brainstem-spinal projections in the sea lamprey (PubMed) 
http://www.ncbi.nlm.nih.gov/pubmed/18602462 
Only abstract available online.  I got the PDF from the library.     
"... two serotonergic populations of the isthmic and vagal reticular regions present reticulospinal neurons from the beginning of the larval period. 
Of the three serotonergic subpopulations recognized in the isthmic reticular group, only two – the medial and ventral subpopulations – project to the spinal cord, withmost of the projecting cells in the caudal part of the medial isthmic subpopulation.
The vagal reticular serotonergic nucleus situated in the caudal rhombencephalon also presents cells with descending projections. The early development of the brainstem serotonergic projections to the spinal cord appears to be a conserved trait in all vertebrates studied.
Although a serotonergic hindbrain–spinal projection system appears to have been present before the divergence of agnathans and gnathostomes, no serotonergic cells were observed in the raphe region in lamprey. Moreover, proportionally more rostral hindbrain serotonergic cells contribute to the spinal serotonergic projections in the sea lamprey than in jawed vertebrates." 


Ontogeny of 5-HT Neurons in the
Brainstem of the Lamprey
http://www.ncbi.nlm.nih.gov/pubmed/16506194 
Only abstract available online.  I got the PDF from the library. 
"... three main 5-HT-ir neuron groups. The rostralmost brainstem group was located near the posterior commissure, the second group at the isthmus, and the third group in the bulbar area. For each of those groups, the distribution of the 5-HT-ir neurons was very similar in the three developmental stages examined, suggesting that the 5-HT system is  relatively mature early in larval animals." 


Organization of the lamprey striatum - transmitters and projections. - 1997
http://www.ncbi.nlm.nih.gov/pubmed/9359610




180928 - 0747     
 
 


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