Proprioceptive hair cells on the neck of the squid Lolliguncula brevis: a sense organ in cephalopods for the control of head-to-body position.
Proprioceptive hair cells on the neck of the squid Lolliguncula brevis: a sense organ in cephalopods for the control of head-to-body position.
复制标题
鱿鱼 Lolliguncula brevis 颈部的本体感觉毛细胞：头足类动物中用于控制头到身体位置的感觉器官。
DOI：
10.1098/rstb.1995.0101
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Budelmann,BU
中科院分区：
文献类型：
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作者：
Preuss,T;Budelmann,BU
十足目头足类动物，如乌贼和鱿鱼，有一个明显的颈部区域，允许头部相对于身体运动(滚动、俯仰和偏航)。本文描述了短尾鱿鱼颈部本体感觉毛细胞的结构、神经支配和中枢通路，这些毛细胞感知这种运动并控制头到体的姿势。这些毛细胞存在于颈部的背侧，在颈椎软骨的下方，靠近动物颈脊两侧的中线。每侧毛细胞可分为前群25-35个和后群70-80个。单个毛细胞最多携带300根等长的动纤毛(大约下午30分钟)，排列成七排。左前组和右前组的毛细胞在形态上向内侧极化，而左后组和右后组的毛细胞在前方向上极化。毛细胞是主要的感觉细胞。它们由眶后神经的一个分支支配，投射到腹侧大细胞叶的腹侧部分。传出突触接触位于毛细胞的底部。在行为学测试中，研究了颈部毛细胞对头部位置控制的影响。在施加身体滚动期间，细胞的单侧去传入导致代偿性头部滚动响应的不对称变化，并引起相对于操作侧的头部滚动偏移。细胞的双侧去传入引起了向下的头部节距偏移。在施加身体俯仰时，该偏移量被叠加在补偿头俯仰响应上。这些形态和行为的发现表明，Loliguncula brevisa的颈部毛细胞和相关的颈部软骨结构形成了一个颈部感受器，它与状态囊和内脏一起控制着动物头部和身体的位置。
Decapod cephalopods, such as cuttlefishes and squids, have a distinct neck region that allows movements (roll, pitch and yaw) of the head relative to the body. This paper describes the structure, innervation and central pathways of proprioceptive hair cells on the neck of the squid Lolliguncula brevis that sense such movements and control head-to-body position. These hair cells exist on the dorsal side of the neck underneath the nuchal cartilage, close to the animal’s midline on either side of the nuchal crest. On each side, the hair cells can be divided into an anterior and a posterior group of 25—35 and 70—80 cells, respectively. An individual hair cell carries up to 300 kinocilia of equal length (about 30 pm), arranged in up to seven rows. The hair cells of the left and right anterior group are morphologically polarized in the medial direction, whereas the hair cells of the left and right posterior group are polarized in the anterior direction. The hair cells are primary sensory cells. They are innervated by a branch of the postorbital nerve and project ipsilaterally into the ventral part of the ventral magnocellular lobe. Efferent synaptic contacts are present at the base of the hair cells. In behavioural tests the influence of the neck hair cells on head position control was investigated. During imposed body rolls, a unilateral deafferentation of the cells caused an asymmetric change of the compensatory head roll response and elicited a head roll offset to the operated side. Bilateral deafferentation of the cells elicited a downward head pitch offset. This offset was superimposed on the compensatory head pitch response during imposed body pitch. These morphological and behavioural findings show that the neck hair cells and the associated nuchal cartilage structures ofLolliguncula brevisform a neck receptor organ that, together with statocyst an visua inputs, controls the position of the animal’s head and body.