Fiber size and sensory endings of the middle cardiac nerve of the domestic fowl (Gallus domesticus).
The middle cardiac nerve, a branch of the vagus, innervates the ventricles of the avian heart. Of 533 myelinated sensory fibers, the size range was 2 micron. The ratio of myelinated to unmyelinated sensory fibers ranged from 2.17 to 3.48. Sensory endings resembled a network pattern with no distinct receptor-like endings. Frequency of nerve population increased from apex to base of the heart.
D000818:Animals; D002645:Chickens / Q000033:anatomy & histology*; D006321:Heart / Q000294:innervation*; D008297:Male; D009412:Nerve Fibers / Q000033:anatomy & histology*; D009413:Nerve Fibers, Myelinated; D011984:Sensory Receptor Cells / Q000033:anatomy & histology; D014630:Vagus Nerve / Q000033:anatomy & histology*