ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (12): 2493-2500.doi: 10.11843/j.issn.0366-6964.2016.12.020

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Ultra-morphological Comparative Observation on Scolex of Hook and No-hook Cysticercus pisiformis

PAN Yao-qian1* , LI Rui-zhen1, YIN Mei1，TANG Hai-rong1, FENG Chun-hua2, ZHANG Hui-hui1   

  1. (1.Henan Institute of Science and Technology, Xinxiang 453003, China; 2. Xinxiang Prevention and Control Center of Animal Epidemic Disease, Xinxiang 453003, China)
  • Received:2016-06-16 Online:2016-12-23 Published:2016-12-23

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Abstract:

The aim of the study was to observe comparatively the ultrastructural changes of hook and no-hook cysticercus pisiformis (C. pisiformis) under relative rest and moton. The well-developed C. pisiformis were obtained in the procedure of slaughter inspection and autopsy. The C. pisiformis was taken out by cutting cyst directly, or cultured with normal saline containing 10% rabbit’s bile until evagination. Then samples were made, observed and recorded by scanning electron microscopy. Ultrastructural changes of hook and no-hook C. pisiformis mainly appeared on rostellum. The head end of hook C. pisiformis was relatively dull, and connected antlers-liking hook through cutaneous muscular columns. In the mild movement the cutaneous muscular columns on rostellum contracted, hooks were outward stretch and the head end of rostellum become flat. When cutaneous muscular columns sostenuto contracted, the head end of rostellum began to invaginate, hook outspread toward diagonal upward side and formed bell mouth-like structure. When rostellum powerfully contracted, the cutaneous muscular column got into the rostellum and become a cylinder, hook arranged along cylinder mouth and formed chrysanthemum-like structure. At relative rest the restellum of no-hook C. pisiformis was flat, liking several layers of oblaten stacked together, there was a round nodule in central part and gear-like decorative design on periphery. When rostellum mild exercised the nodule in central part invaginated and presented valvula-like structure, periphery of rostellum had half round cyclic structure and looked like a life buoy. When rostellum was in strong movement, the valvula-like structure of nodule was opened and looked like a bell mouth. Tegument around rostellum expanded toward outside, looking like a tyre structure. There were several radial folds between the bell mouth of rostellum and tyre-like structure. The rostellum turned into wheel-like structure. The suckers of hook and no-hook C. pisiformis were located behind restellum and had three contraction patterns that were annular contraction, longitudinal contraction and radical contraction. Ultrastructural structure of reostellum of hook and no-hook C. pisiformis is totally different and respective special structural changes appear in the different motion state.

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