Finger T E, Kalil K
J Comp Neurol. 1985 Sep 22;239(4):384-90. doi: 10.1002/cne.902390404.
The functional organization of the motoneurons in the spinal cord of the sea robin, Prionotus carolinus, was studied by means of retrograde transport of horseradish peroxidase (HRP). This species has a complex pectoral apparatus which includes not only a webbed fin, but also three independently mobile fin rays. The motoneurons in the rostral spinal cord fall into two longitudinal columns: dorsal and ventral. The motoneurons of the ventral column innervate the appendicular musculature of the pectoral apparatus. Within the ventral motor column of the rostral spinal cord, four distinct motoneuronal pools were found. The largest pool is situated at the rostral-most end of the spinal cord and contains the motoneurons that innervate the musculature of the webbed pectoral fin. The motoneurons that innervate the fin rays are located in sequentially more posterior pools so that the anteroventral fin ray is controlled by motoneurons situated farthest caudally. The somatotopic arrangement exactly corresponds to the sensory somatotopy determined previously. Furthermore, each fin ray has its sensory representation in a unique accessory spinal lobe which is connected in a reflex fashion to the motoneuronal pool that provides motor output to the same fin ray.
利用辣根过氧化物酶（HRP）逆行运输法，对海鲂（Prionotus carolinus）脊髓中的运动神经元功能组织进行了研究。该物种具有复杂的胸鳍装置，不仅包括一个有蹼的鳍，还有三根可独立活动的鳍条。脊髓前部的运动神经元分为两个纵向柱：背侧柱和腹侧柱。腹侧柱的运动神经元支配胸鳍装置的附属肌肉组织。在脊髓前部的腹侧运动柱内，发现了四个不同的运动神经元池。最大的池位于脊髓最前端，包含支配有蹼胸鳍肌肉组织的运动神经元。支配鳍条的运动神经元位于依次更靠后的池中，因此前腹侧鳍条由最靠尾端的运动神经元控制。这种躯体定位排列与先前确定的感觉躯体定位完全一致。此外，每根鳍条在一个独特的副脊髓叶中有其感觉表征，该副脊髓叶以反射方式与为同一鳍条提供运动输出的运动神经元池相连。
