Spinal Cord and Nerves Flashcards
Where is White and Gray matter found within the spinal cord?
Gray body (cell body, dendrites and unmyelinated axons) found inside the 'Butterfly'. Myelinated axons, white matter, are outside the butterfly.
Where is Gray and White Matter found in the brain?
Gray matter is external, White matter is internal
Gray matter Horns
Anterior horn (don’t extend as close to exterior of the cord, left and right), posterior (on back of cord- left and right, extends closer to surface of cord, and lateral porn (left and right, small, lay in between the posterior and anterior horns).
What are the 3 regions of the White matter?
Dorsal posterior white column( or finiculus) - have 2, left and right, by posterior horns
anterior white column
Lateral column
How is the spinal cord divided?
Anterior median Fissure (separates the right side from left including the anterior finicula)
Posterior median sulcus- separates the posterior finicula
What are the spinal roots?
They are the anterior (ventral) and posterior (dorsal)parts of the spinal nerve before it conjoins to form the spinal nerve
What is the bulge in the posterior root?
before the posterior root join with the anterior, it houses the cell body called the dorsal root ganglion, its only on the posterior root.
Where does the spinal nerve begin?
Where the anterior and posterior roots combine
What happens as the spinal nerve travels away from spine?
It divides posteriorly and anteriorly.
The parts that divide off the nerve are called the ramus. The smaller division (travels posteriorly) and the bigger one is the anterior ramus.
What is the Ganglion Sympathetic Chain?
It travels perpindicular to the spinal nerve and combines with the anterior ramus (via the rami communicanties(or sympathetic rami))
What is the Pia matter?
Deepest of the meninges.
Directly makes contact with the spinal cord.
What is the layer between the innermost and outermost meninges?
The Arachnoid Matter
What is the outermost layer of meninges?
Spinal Dura matter
Where is cerebral spinal fluid found?
Subarachniod space between the pia and arachnoid matter.
What are the intermediate spaces?
Epidural space, subdural (between dural and arachnoid mater), and subarachnoid space
