The levatores costarum and their nerve supply in Thais.

ABSTRACT

In a study on their shape, attachments and nerve supply, the levatores costarum muscles were dissected in 43 adult Thai cadavers, 23 males and 20 females. The levators costarum are twelve in number on each side, being triangular in shape. They arise from the tip of the transverse process of a vertebra of a vertebra from the seventh cervical to the eleventh thoracic inclusively. They then fan out as descend to be inserted into the external surface of the rip below, between the angle and the tubercle of the rib. Sixty-two percent from 906 muscles are levatores costarum breves. The rest are levators costarum longi found in various levels the lateral branches of the dorsal rami of the corresponding spinal nerves. The ventral rami of the spinal nerves give no branch to supply these muscles.