what layer gives off the denticulate ligament
Laterally, the pia forms a discontinuous longitudinal septum, the denticulate ligament (see fig. 41-3), which sends about 21 tooth-like processes laterally to fuse with the arachnoid and dura on each side. The ligament is a surgical landmark in that it is attached to the spinal cord about midway between the attachments of dorsal and ventral roots. Further details concerning the spinal cord should be sought in books on neuroanatomy.