Spinal Cord Flashcards
Afferent info comes through ___ roots + horn
Dorsal
The spinal cord is the origin of LMNs which ______ from the ___ horn
Command muscles
Ventral
The spinal cord is…
Protected by ___
Covered by ___
Spinal nerves exit through the ___ foramen
Vertebral column
Meninges
Intervertebral foramen
Meninges are a ___ membrane w/ three layers;
And three spaces.
CT membrane
- Epidural space: fat
Dura
- Subdural: location of veins
Arachnoid
- Subarachnoid: CSF + arteries
Pia
The adult spinal cord is continuouse w/ the ___ and ~___cm long
Medulla
42-45cm long
Spinal cord terminates in the _____ at the _____ vertebral level.
Conus medullaris
L1-L2
Name the spinal cord enlargements and their locations
Cervical enlargement - lower cervical
Lumbar enlargement - lower thoracic
What exists below conus medularis/L1-L2
Cauda Equina - nerve roots extend below conus medularis
Bell-Magendie Law
Dorsal roots = sensory
Ventral roots = motor
Segments for each level of the spinal cord
Cervical = 8
Thoracic = 12
Lumbar = 5
Sacrum = 5
Few Coccygeal
(Correspond to # of spinal nerves, so cervical has 7 vertebrae but 8 spinal cord segments)
The ventral horn gray matter contains ___ of __ + __ what type of neurons?
Cell bodies of alpha + gamma LMNs
The dorsal horn gray mater contains
Sensory cell bodies
The intermediolateral gray matter contains preganglionic ___ neurons in:
T1-L2
S2-4
T1-L2: sympathetic
S2-4: parasympathetic
The white matter is arranged in several columns called ___.
Dorsal columns include ___ + ___
Ventral + lateral columns contain ___ that overlap for several functions (mostly motor)
Funiculi
Fasciculus gracilis + cuneatus
Tracts
How many pairs of spinal nerves? How many correlate to each segment of the spinal cord?
31 pairs
8 Cervical
12 Thoracic
5 Lumbar
5 Sacral
1 Coccygeal
