Flashcards in Neuro - Spinal Cord Deck (18):
Name the 3 funiculi of the spinal cord.
- posterior funiculus
- lateral funiculus
- anterior funiculus
Name the four sulci.
- posterior median sulcus
- posterior intermediate sulcus
- posterolateral sulcus
- anterolateral sulcus
What is the caudal extent of the posterior intermediate sulcus?
posterior intermediate sulcus only extends to level T6 so that is the caudal extent
What 2 bundles of fibers are separated by the posterior intermediate sulcus?
- fasciculus gracilis
- fasciculus cuneatus
Name the cord levels between which the lateral horn is found.
Name the two structures that stabilize the spinal cord within the vertebral canal.
- denticulate ligaments - extend from the cord through the arachnoid to the dura
- spinal nerves - anchor the cord in the vertebral canal
Name the sensory function modulated by Lamina II.
pain (substantia gelatinosa)
In what direction are the impulses traveling that are found in the posterior root? In the anterior root? In the spinal nerve?
- posterior root - carries sensory signals toward the cord
- anterior root - carries motor signals away from the cord
- spinal nerve - carries signals toward and away from the cord
What is the posterior root ganglion?
found along the posterior root; contains the neuron cell bodies of the nerve fibers that make up the posterior root
What part of the body (soma) is served by the nerve fibers that make up the posterior ramus? The anterior ramus?
- posterior ramus - serves posterior aspect of the body
- anterior ramus - serves anterior aspect of the body
Are the anterior and posterior rami sensory in function? Motor in function?
The anterior and posterior rami are both sensory and motor in function since they carry fibers from the posterior and anterior roots.
Why are the communicating rami described in terms of colors (gray and white)? What function do these rami serve?
- gray matter is made up of neuron cell bodies
- white matter is made up of myelinated axons
- the gray and white communicating rami contain autonomic fibers and branch off the spinal nerve at T1-L2
Name the nerve fibers that make up the cauda equina.
posterior and anterior roots; occupies the lumbar cistern
Name the vertebral level that marks the caudal extent of the conus medullaris.
the caudal cone-shaped end of the spinal cord; extends to the L1-L2 interspace
Name the tissue that makes up the denticulate ligaments.
pia and arachnoid
Name the tissue that makes up the filum terminale.
pia and arachnoid that extend from the conus medullaris which is eventually encased in dura
What is contained within the lumbar cistern?
cauda equina and cerebrospinal fluid, along with the filum terminale