Spinal cord, motor & Sensory Pathways I Flashcards
(120 cards)
What does ipsilateral mean?
Same side of the body
What does contralateral mean?
Opposite side of the body
What is a ramus?
A branch
What is a tract?
Tract = column = bundle = funiculus = fasciculus = lemniscus
What is a decussion?
Decussion = chiasm = raphe
What are structure names based on?
Their location
What structure of the brain does the spinal cord continue from?
The medulla
Where does the spinal cord end? What spinal level is this?
At the conus medullaris (L1/L2)
What structure arises after the terminal part of the spinal cord?
The cauda equina (horse’s tail)
What is the cauda equina made up of?
It is made up of lumbar and sacral spinal nerves
How many spinal segments are there?
31 spinal segments; 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 occygeal
How many vertebral segments are there?
33; 7 cervical, 12 thoracic, 5 lumbar, 5 sacral, 4 coccygeal
What does the cervical segment of the spinal cord supply?
supplies upper extremities
Which spinal cord segments does the cervical enlargement consist of?
C5 - T1
What spinal cord segments does the lumbar enlargement consist of?
L2 - S3
What does the lumbar enlargement supply?
Supplies lower extremities
What is a spinal cord segment?
The portion of the spinal cord supplying a single spinal nerve
Where do white and grey matter sit in the spinal cord?
grey matter inside of the cord surounded by white matter
What happens in dorsal root ganglia?
Cell bodies are collected.
What do dorsal root ganglia collect?
Sensory input
Where do dorsal root ganglia enter the spinal cord?
Via the dorsolateral sulcus
Where do cell bodies of motor neurons sit?
In the ventral horn of the spinal cord.
Where do motor neurons exit?
Via ventrolateral sulcus
Is the ventrolateral sulcus well defined and a visible structure?
No