The Korean Journal of Zoology (한국동물학회지)
- Volume 39 Issue 2
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- Pages.223-230
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- 1996
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- 0440-2510(pISSN)
Fine Structural Analysis of the Neuromuscular Junction in the Venomous Organ of the Spider, Agelena limbata (Araneae: Aselenidae)
거미(agelena Limbata Thorell) 독 분비기관의 신경근육간 연접장치의 미세구조적 분석
Abstract
Fine structure of the neuromuscular junction in the venomous organ of the spider, Agelena li'mbutq, was studied using high magnification electron microscope. The motor nerve endings at neuromuscular contact area composed of neurons and neuroslial cells were located between musculature and extracellular sheath of the venom gBand. At the synaptic contact between a motor axon and a muscle fiber in the musculature, spherical synaptic vesicles were prominent in the nerve terminal. The sarcoplasm beneath the neuromuscular synapse has a granular appearance and lacks mvofilaments. And the main axon gives off a branch between the muscle fibers. The synaptic regions of this organ are located close to the myofilaments unlike to other chelicerate classes. Moreover the postsvnaptic complex of vesicles and membrane invasinations present in other synaptic legions are absent from these legions in this venomous organ.