Week 2 Flashcards
what is the dorsal median sulcus
the shallow depressionon dorsal midline of spinal cord; runs entire length of spinal cord
what is the dorsal median septum
infolding of pia mater that runs almost to gray matter
what is located on the ventral spinal cord
ventral median fissure
are there axons in gray matter?
yes
ratio of gray matter to white matter
varies depending on section of spinal cord
what are the 3 areas of gray matter
dorsal gray horn
ventral gray horn
intermediate gray horn
dorsal gray horn function
sensory integration area
intermediate gray horn lateral part
intermediolateral gray horn
what is present in the intermediolateral gray horn
GVE preganglionic LMN
where is the region of the intermediolateral gray horn
T1-T4, S1-S3
Interneurons for _____ are located in the intermediate gray horn
autonomic NS
Ventral gray horn size
larger when numerous LMN going to skeletal muscle (C6-T2, L4-S2)
What is located in the ventral gray horn
GSE LMN
What are the major areas of the white matter
dorsal funiculus
ventral funiculus
lateral funiculus
dorsal funiculus contains
ascending projection neurons
can also have sensory neurons that dont synapse
ventral funiculus contains
descending projection neurons (UMN)
Lateral funiculus
mixture of ascending and descending projection neurons
what is the fasciculus propruis
named portion of white matter; band that surrounds gray matter
what is contained in the fasciculus proprius
axons of short interneurons traveling up/down 2 or so cord segments
what are the 3 major functions of the spinal cord
- recieves and integrates sensory information
- serves as a conduit for information TO and FROM the brain
- Controls and regulates motor activity (conscious and reflex)
Does every spinal cord carry sensory information
yes
every spinal nerve is made up of ____
roots (rootlets)
roots can be used as landmarks to locate
individual cord segments
dorsal rootlets characteristics
afferent, pseudounipolar; cell bodies in dorsal root anglia
ventral rootlets characteristics
efferent, all carry GSE; select ones carry GVE; ramus communicans branch off
branches of spinal nerves include
dorsal
ventral
communicating (ramus communicans)
meningeal
dorsal branches
less to supply so they are smaller
communicating are located in what region are preganglionic sympathetic
T1-L4
ramus communicans region of postganclionic sympathetic
all
meningeal branches
a lot of nociceptors primarily from dura mater; no sensory input from CNS
why is there pain felt when there is herniated disk?
mashing on meninges where a lot of nociception receptors located
