title: The fine structure of the pores in the shell of the hen's egg.
abstract: No fibrous or crystalline material was present in the lumen of pore canals which were exposed by radial fracture and examined with a scanning electron microscope. The walls of the canals were rough, but they did not have a characteristic ultrastructure. The campanulate outer orifice of the pores was plugged with cuticle in which radial cracks formed channels through which the respiratory gases presumably diffuse.
mesh_terms: D000818:Animals; D002645:Chickens / Q000033:anatomy & histology*; D004528:Egg Shell / Q000648:ultrastructure*; D005260:Female; D008855:Microscopy, Electron, Scanning