Dermatomes & myotomes, spine Flashcards
how many segements is the spinal cord composed of?
31 segments
what is a Funiculus, Tract, Fasciculus
- white matter is organised into______
- grey matter in the cord is organised into ______
- white matter is organised into tracts
- grey matter in the cord is organised into cell columns
function of spinal roots, what r the 2 types entering and exiting the spinal cord and what type of nerve fibers do they contain?
what does each horn carry?
ventral> motor neurons
Dorsol > sensory neurons
lateral> sympathetic neurons
what is a spinal nerve?
label neuron
Label microscopic neuron
Spinal cord runs through ______________ .
Spinal nerves leave spinal canal via ______________.
vertebral foramen
intervertebral foramina
where does the spinal cord specifically start and end?
Starts at inferior margin of medulla oblongata
Ends as conus medullaris at L2
where does the First cervical pair of spinal nerves emerge from?
between occipital bone and atlas (C1)
Explain how nerves exit the vertebrae in the spine
from C1-C7 they exit above corresponding vertebrae
***Spinal nerve C8 exits between vertebrae C7 and T1*
from T1-L5 exit below corresponding vertebrae
explain what happens after a mixed nerve is formed…what comes next?
mixed spinal nerve divides into RAMI!
Posterior / dorsal ramus: deep muscles and skin of dorsal trunk (small)
Anterior / ventral ramus: muscles and skin of the upper and lower limbs and lateral and ventral trunk (large)
but wait… the spinal nerve also gives another branch, i mean someone has to supply the ligaments, meninges, and vertebrae right?
so whats this branch called? come onnnnn gimme ur best shot!!
Meningeal branch!
Re-enters spinal canal through intervertebral foramen
another pic for fun
Dermatome
do the myotome daaaaaance
myotome and dermatome
define
be aware lalls
