test 1: lab 3 Flashcards
three regions of white matter in the spinal cord
dorsal funiculus
ventral funiculus
lateral funiculus
___ septum divides the white matter in the spinal cord
dorsal median septum (in the dorsal funiculus)
___ fissure divides the white matter on the ventral side
ventral median fissure
___ is where the rootlets enter the spinal cord
dorsolateral sulcus
divisions of the spinal grey matter
dorsal horn
intermediate zone
ventral horn
___ contains sensory inputs (somatic and visceral afferents)
dorsal root
___ contain somas of sensory afferents entering the spinal cord
DRG
___ motor outputs (somatic and visceral efferents)
ventral root
___ - mixed sensory and motor
spinal nerve
spinal cord ends below L1 vertebrae as the ___
conus medullaris
lumbar and sacral nerves after L1 form the ___
cauda equina
where?
cervical
thoracic
lumbar
ventral horns have info about ___
motor to muscles
where?
C8 ( large ventral horn sorta oval)
where are preganglionic sympathetic axons found in the spinal cord?
lateral horn (T1-L2)
where do you find the preganglionic parasympathetic in the spinal cord?
S1-S3
what kind of cells are in the intermediolateral cell column?
cells of the ANS
- Preganglionic sympathetic (lateral horn; T1-L2)
- Preganglionic parasympathetic (S1-S3)- rest and digest
what is in the dorsal column of the spinal cord?
- Fascicululs gracilis (hindlimb)
- Fasciculus cuneatus (forelimb) (above T5)
___ part of the dorsal column of the spinal cord that controls the frontlimb is found ___
Fasciculus cuneatus (forelimb)
(above T5)
what kind of axons in white matter
myelinated
motor→ down
sensory →up
ascending tracts in the spinal cord
spinothalamic tract→ pain and temperature
anteriolateral tract
ascending pathway
fasiculus cuneatus (upper body)
DC-ML → touch and proprioception
ascending tract
fasiculus gracilis
lower body - touch and proprioception
DC-ML
dorsal spinocerebellar tract
ascending tract
lower limb- unconscious proprioception
lateral corticospinal tract
descending motor
rubrospinal tract
descending motor
ascending pathways to the neocortex
dorsal column - medial lemniscal tract (conscious proprioception/touch/vibration)
spinothalamic tract (pain/temperature)
ascending pathways in the spinal cord to the cerebellum
for unconscious proprioception
- *dorsal spinocerebellar trac**t-lower limb- clarke’s nucleus
- *cuneocerebellar tract**- upper limb- accessory cuneate nucleus
Dorsal Column - Medial Lemniscal Tract
from toe (soma in DRG)→ medulla → cross sides→ thalamus → cerebral cortex (somatosensory cortex)
Fasiculus gracilis – hindlimb S,L
Fasiculus cuneatus – forelimb T,C
body map of the dorsal column
Fasiculus gracilis – hindlimb →Sacral, Lumbar
Fasiculus cuneatus – forelimb →Thoracic, Cervical
Somatotopy – body map
spinothalamic tract
pain and temperature
sensory → dorsal horn → 2nd switches sides travels contralaterally up spinal cord up the (anterolateral tract)→ VPL of the thalamus → cerebral cortex (somatosensory cortex)
two types of descending spinal pathway
ventromedial pathway → posture, balance, locomotion→ brainstem control
lateral pathway → voluntary movement of distal muscles→ cortical control
- Control of posture, locomotion, orienting and balance •Under brainstem control
- Innervate axial and proximal musculature
ventromedial pathway
(descending spinal pathways- upper motor neurons)
- Voluntary movement of distal musculature
- Under direct cortical control
- Innervate distal musculature
lateral pathway
descending spinal pathway (upper motor neurons)
what pathway allows detailed finger movement
corticospinal tract
(upper motor neuron)
descending pathway
change sides
Where in the spinal cord can you find ANS?
Intermediolateral cell columns:
Sympathetic: thoracolumbar (in lateral horn, T1-L2) Parasympathetic: craniosacral (S1-S3)
what part of the ANS uses norepinephrine?
sympathetic
what part of the ANS use ACh?
