. Cunningham's Text-book of anatomy. Anatomy. 1044 THE VASCULAK SYSTEM. thoracic and lumbar regions that their original characters are retained. The paired vessels pass dorsally, by the sides of the vertebrae, and divide into dorsal and ventral branches which accompany the corresponding anterior and posterior divisions of the spinal nerves. The ventral branches run ventro-laterally between the ribs, in the thoracic region, and in corresponding positions in the lumbar region, and together with the stems they form the main parts or trunks of the vessels in the thoracic and lumbar regions. They a
. Cunningham's Text-book of anatomy. Anatomy. 1044 THE VASCULAK SYSTEM. thoracic and lumbar regions that their original characters are retained. The paired vessels pass dorsally, by the sides of the vertebrae, and divide into dorsal and ventral branches which accompany the corresponding anterior and posterior divisions of the spinal nerves. The ventral branches run ventro-laterally between the ribs, in the thoracic region, and in corresponding positions in the lumbar region, and together with the stems they form the main parts or trunks of the vessels in the thoracic and lumbar regions. They are connected together, near their commencements, by a series of pre-costal anastomoses which pass in front of the necks of the ribs, and they are also connected together, near their terminations, by ventral anastomos- ing channels which run, in the thoracic region, behind the costal cartilages, and in the lumbar region behind or in the substance of the rectus abdominis muscle. Each ventral branch gives off a lateral offset which is distributed like the lateral cutaneous branch of a spinal nerve, and together with the stem of the intersegmental artery it forms the trunk of an intercostal or lumbar artery in the adult. The dorsal branches, which are present before the ventral branches, run dorsally between the transverse processes of the vertebras, and form the posterior branches of the intercostal arteries and the dorsal branches of the lumbar arteries of the adult; they are connected, behind the necks of the ribs, by post-costal anastomoses, and again, behind the transverse processes of the vertebras, by post-transverse anastomosing channels. Moreover, each dorsal branch, as it passes by the cor- responding intervertebral foramen, gives off a spinal offset which enters the spinal canal, along the corresponding nerve-root, and divides into a dorsal, a ventral, and a neural branch. The Pre-laminar anastomosi Post-neural anastomosi Post-transverse anastomosis Post-central anastomo
Size: 1544px × 1619px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
