TY - JOUR
T1 - The distribution and ultrastructure of sensory elements in the baroreceptor region of the truncus arteriosus of the lizard Trachydosaums rugosus
AU - Berger, P. J.
AU - Gibbins, I. L.
AU - Hards, D. K.
AU - Crosby, L. J.
PY - 1982/9
Y1 - 1982/9
N2 - The proximal truncus arteriosus of the lizard Trachydosaurus rugosus was studied with light-, fluorescence and electron-microscopical techniques. Three vessels comprised the truncus: the pulmonary, left aortic, and caroticoaortic arteries. Right and left truncal nerves, each derived from the ipsilateral vagus nerve, innervated the truncus, particularly its proximal 3 mm. Ultrastructurally, the nerves had a variety of appearances: some were clearly adrenergic, c-type or p-type. A number of profiles contained large numbers of mitochondria and were classified as sensory. Some profiles defied exact classification, having characteristics common to two different types of profile. Within the outer medial layers, profiles up to 7 μm in diameter were found. These contained large numbers of mitochondria, myelin bodies and structures intermediate between the two. In addition, the profiles contained large amounts of glycogen and small numbers of vesicles. These nerve fibres were classified as baroreceptors, since they closely resemble carotid sinus and aortic arch baroreceptors in mammals. Large numbers of chromaffin cells were found, particularly in the common wall of the pulmonary and left aortic arteries. Many of these cells emitted a long tapering process, which sometimes entered a nearby nerve bundle. Sensory, p-type and c-type profiles, but not adrenergic profiles, made extensive close contacts with chromaffin cells.
AB - The proximal truncus arteriosus of the lizard Trachydosaurus rugosus was studied with light-, fluorescence and electron-microscopical techniques. Three vessels comprised the truncus: the pulmonary, left aortic, and caroticoaortic arteries. Right and left truncal nerves, each derived from the ipsilateral vagus nerve, innervated the truncus, particularly its proximal 3 mm. Ultrastructurally, the nerves had a variety of appearances: some were clearly adrenergic, c-type or p-type. A number of profiles contained large numbers of mitochondria and were classified as sensory. Some profiles defied exact classification, having characteristics common to two different types of profile. Within the outer medial layers, profiles up to 7 μm in diameter were found. These contained large numbers of mitochondria, myelin bodies and structures intermediate between the two. In addition, the profiles contained large amounts of glycogen and small numbers of vesicles. These nerve fibres were classified as baroreceptors, since they closely resemble carotid sinus and aortic arch baroreceptors in mammals. Large numbers of chromaffin cells were found, particularly in the common wall of the pulmonary and left aortic arteries. Many of these cells emitted a long tapering process, which sometimes entered a nearby nerve bundle. Sensory, p-type and c-type profiles, but not adrenergic profiles, made extensive close contacts with chromaffin cells.
KW - Baroreceptor
KW - Chromaffin cell
KW - Truncus arteriosus, lizard
KW - Vagus nerve
UR - http://www.scopus.com/inward/record.url?scp=0020366411&partnerID=8YFLogxK
U2 - 10.1007/BF00218368
DO - 10.1007/BF00218368
M3 - Article
C2 - 7127435
AN - SCOPUS:0020366411
SN - 0302-766X
VL - 226
SP - 389
EP - 406
JO - Cell and Tissue Research
JF - Cell and Tissue Research
ER -