Stephens P J
J Neurobiol. 1985 Sep;16(5):361-72. doi: 10.1002/neu.480160503.
The physiological and morphological properties of the giant interneurons in the hermit crab Pagurus pollicaris are described. The cell bodies are located anteriorly in the supraesophageal ganglion, close to the mid-line. Each cell sends a neurite posteriorly and then laterally, so that they cross over in the center of the ganglion. Each axon then branches: one branch runs laterally while the other travels posteriorly and leaves the ganglion in the circumesophageal connective on the side contralateral to the cell body. The giant axons travel in the circumesophageal connectives and through the thoracic and abdominal ganglia without branching. Each giant axon makes synaptic contact with its ipsilateral giant abdominal flexor motor neuron and with a second flexor motor neuron that has its axon in the contralateral third root. In the supraesophageal ganglion there is a bidirectional synapse between the two giant interneurons. Intracellular recordings from the giant axons show that there is a delay of 0.5 to 0.75 ms that cannot be accounted for by spike propagation along the axons, and may be accounted for by a chemical synapse between the giant interneurons.
描述了寄居蟹Pagurus pollicaris中巨型中间神经元的生理和形态特性。细胞体位于食管上神经节的前部，靠近中线。每个细胞向后发出一条神经突，然后转向侧面，使其在神经节中心交叉。然后每个轴突分支：一个分支横向延伸，另一个向后延伸，并在与细胞体相对侧的食管周围结缔组织中离开神经节。巨型轴突在食管周围结缔组织中穿行，并通过胸神经节和腹神经节，不发生分支。每个巨型轴突与其同侧的巨型腹部屈肌运动神经元以及另一个屈肌运动神经元形成突触联系，该屈肌运动神经元的轴突位于对侧第三根神经中。在食管上神经节中，两个巨型中间神经元之间存在双向突触。从巨型轴突进行的细胞内记录表明，存在0.5至0.75毫秒的延迟，这不能用沿轴突的动作电位传播来解释，可能是由巨型中间神经元之间的化学突触引起的。
