sacral canal การใช้

• The sacral canal as a continuation of the vertebral canal runs throughout the greater part of the sacrum.
• The sacral canal is a continuation of the spinal canal and runs throughout the greater part of the sacrum.
• Behind this is the large triangular orifice of the sacral canal, which is completed by the lamina and spinous process of the first sacral vertebra.
• This ligament is divisible in two parts : A short deep part which unites the two bones, and a larger superficial portion which completes the lower back part of the sacral canal.
• Sometimes the uppermost transverse tubercles are not joined to the rest of the ala on one or both sides, or the sacral canal may be open throughout a considerable part of its length, in consequence of the imperfect development of the laminae and spinous processes.
• The laminae of the fifth sacral vertebra, and sometimes those of the fourth, do not meet at the back, resulting in a fissure known as the "'sacral hiatus "'in the posterior wall of the "'sacral canal " '.
• In its course it gives off branches, which enter the anterior sacral foramina; these, after supplying the contents of the sacral canal, escapes by the posterior sacral foramina, and are distributed to the muscles and skin on the dorsal surface of the sacrum, anastomosing with the gluteal arteries.