Three-dimensional structure of the presynaptic nerve ending in the ciliary ganglion of the chick embryo: a scanning electron microscopic study.
Presynaptic nerve endings in the ciliary ganglia of chick embryos are 3-dimensionally examined by scanning electron microscopy. Underdeveloped nerve endings attached to the lateral side of the ciliary cells are spoon-like, and show an irregular surface texture and marginal outline with many slender processes and pores. Well-developed nerve endings embracing more than half of the surface of the ciliary cell are cup-like, and show a smooth surface texture and a linear marginal outline with few slender processes and pores. The slender processes come into intimate contact with each other at the margin of the spoon-like nerve endings or cross the pores, seemingly expanding and smoothing the nerve endings. Cytoplasmic processes of the ciliary cells are also described.
Fujiwara
T
T
Laboratory Animal Center, School of Medicine, Ehime University, Japan.
Nagakuro
C
C
D000818:Animals; D002642:Chick Embryo / Q000033:anatomy & histology*; D005724:Ganglia / Q000196:embryology / Q000648:ultrastructure*; D008855:Microscopy, Electron, Scanning; D009474:Neurons / Q000648:ultrastructure*