ISSN:
1432-0878
Keywords:
Crustacean
;
Muscle
;
Nerve
;
Blood vessel
;
Synapses
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were employed to study the innervation and vascular supply of crayfish skeletal muscle. Blood vessels and nerve terminals identified by TEM were often closely associated. Synaptic regions of the nerve terminals were always located under sarcolemma and contained both dense-cored and agranular synaptic vesicles. Axo-axonal synapses of several different types were observed. Blood vessels consisted of several “vessel cells” or “supporting cells” enclosing a lumen, which was connected to the exterior by fine channels between the “supporting cells”. SEM of whole freeze-dried muscles revealed two types of ramifying structure, which often ran in parallel over the muscle surface. One, identified as nerve, was more cylindrical and had a smoother surface than the other, which was identified as blood vessel. Fine nerve branches disappeared under the sarcolemma, probably near synaptic regions, but synapses could not be seen. Blood vessels also had fine terminations which merged into the sarcolemma.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00306801
