An electron microscope study of types of receptor in the chick retina
An electron microscope study of types of receptor in the chick retina
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小鸡视网膜受体类型的电子显微镜研究
DOI：
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发表时间：
1967
期刊：
影响因子：
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通讯作者：
C. D. Shorey
中科院分区：
文献类型：
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作者：
V. Morris;C. D. Shorey
鸡的视网膜上有视杆细胞、双视锥细胞（包括主视锥细胞和副视锥细胞）和两种类型的单视锥细胞。杆状体狭窄，包含一个抛物面，一个基核和一个小的突触体，具有长突触片。主锥体有一个淡色的油滴，并与副锥体对齐，副锥体有一个抛物面，没有油滴，但有一个小颗粒囊泡。主锥体的突触体很大，部分包围着它的附属锥体。副锥体的突触体有一个伸入外丛状层的长突。单锥I型有暗色油滴，椭球体内线粒体致密，有嵴。单锥型II的油滴染色较轻，嵴较少。这两种类型的单锥体的突触体位于杆状体和双锥体的玻璃体上。纤维在单锥体和副锥体中连接突触体和核区域，但在杆锥体和主锥体中没有。另一种类型的突触体，不是受体的突触体，出现在外丛状层。小泡群，如突触体中的小泡群，出现在内节的基部附近；突触囊泡可能起源于此。Muller细胞将每个受体分开，除了双锥的成员，在外限制膜上，并可能将受体定位于色素上皮，以允许内外段的径向取向。
Rods, double cones which comprise a principal and an accessory cone, and two types of single cones occur in the chick retina. The rod is narrow and contains a paraboloid, a basal nucleus and a small synaptic body with long synaptic lamellae. The principal cone has a pale‐staining oil droplet and is aligned against an accessory cone, which has a paraboloid, no oil droplet, but a small granular vesicle instead. The synaptic body of the principal cone is large and partly surrounds that of its associated accessory cone. The synaptic body of the accessory cone has a long process extending into the outer plexiform layer. Single cone type I has a dark oil droplet and the mitochondria in the ellipsoid are dense with cristae. Single cone type II has a lighter‐staining oil droplet and fewer cristae. The synaptic bodies of both types of single cone lie vitreal to those of rods and double cones. Fibres connect the synaptic body to the nuclear region in single cones and accessory cones, but not in rods and principal cones. Another type of synaptic body, which is not that of a receptor, occurs in the outer plexiform layer. Groups of small vesicles, like those in the synaptic body, occur near the base of the inner segments; synaptic vesicles may originate here. Muller cells separate each receptor, except the members of a double cone, at the outer limiting membrane and may position the receptors in relation to the pigment epithelium to allow a radial orientation of the inner and outer segments.