File:The Biological bulletin (20352702516).jpg

Title: The Biological bulletin
Identifier: biologicalbullet187mari (find matches)
Year: [1] (s)
Authors: Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983
Subjects: Biology; Zoology; Biology; Marine Biology
Publisher: Woods Hole, Mass. : Marine Biological Laboratory
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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CEPHALOCARID NfiUROMUSCULAR ULTRASTRUCTURF 21 ^^rjlpgj';:';^.,;v. - .. v^;^$Nf^
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Figure 3. Cross-section of a single ventral abdominal muscle fiber through the A-band region packed with myonlaments and numerous scattered triads (arrows), but not subdivided into myofibrils. Note pe- ripherally located mitochondria. Magnification: X27.000. Scale bar: 1 j/m. tailed decapods such as crayfish and lobsters, the cephal- ocarid abdominal muscles displayed terminals with round synaptic vesicles, suggesting only excitatory motor inner- vation. Such a conclusion, although tentative, is in keeping with the relatively simple organization of the abdominal muscles that generate largely flexion-type movements and occur as a sheath lining the abdominal cylinder. Simplicity in the neuromuscular terminals of the ceph- alocarid abdomen is also seen in the minimal elaboration of the surrounding muscle granular sarcoplasm. Thus synaptic contacts with the muscle membrane are made very close to the myofilaments. with little intervening sar- coplasm. In contrast, neuromuscular synaptic contacts occur on a highly elaborated sarcoplasmic reticulum

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