Ultrastructure of a coronary chemoreceptor of dogs and cats.

摘要: Abstract Ultrastructure of a coronary chemoreceptor which causes hypertensive reflex was examined in three normal dogs and cats. The tissue is periarterial glomoid body composed highly vascular, grape-like clusters regularly located the immediate vicinity left main artery, from it receives its blood supply. Its general histological organization resembles that carotid body. Morphometric analysis indicates chief cells were about twice as numerous sustentacular cells. contain abundant osmiophilic dense granules are surrounded by processes These resemble those adrenal medulla, suggesting they also may be involved production storage amines. Abundant nerve endings formed synapses associated with Numerous sympathetic parasympathetic efferent had characteristic presynaptic junctions to In contrast sensory afferents packed mitochondria but few synaptic vesicles postsynaptic findings suggest not only stores amines serves or chemoreceptive site.