At foramen magnum, spinal and cranial meninges continuous. Loose connective tissue, blood vessels, fat. Fuses with occipital bone around foramen magnum. In sacral canal, forms cord of collagen, with filum terminae forms coccygeal ligaments. Extends between adjacent verterbrae, fuses with connective tissue around spinal nerves.
Epidural block affects only nearby nerves, temporary, motor paralysis.
Spinal tap needle into lower lumbar subarachnoid because no spinal cord. Pia mater Meshwork of collagen and elastic fibers interwoven with subarachnoid space Blood vessels for spinal cord in pia mater. Firmly bound to neural tissue underneath Denticulate ligaments from pia mater, arachnoid, dura mater, on either side of spinal cord to keep meninges in place. Meninges pass thru intervertebral foramina, continuous with connective tissue around spinal nerves. Sensory nuclei receive and relay info from peripheral receptors Motor nuclei sends commands to peripheral effectors.