Flashcards in Spinal Cord Deck (66)
What is the neural tube derived from?
What substance is secreted by the notocord that converts it to the neural tube?
What nutrient affects neural tube development?
What structure precedes the neural tube?
The neural plate
Describe neural tube formation
A groove forms in the neural plate
The inner walls form into inner + intermediate mantle and outer marginal layers
The mantle layer forms dorsal (alar) and ventral (basal) plates
Tissues at the sides of the tube form the neural crest cells
What part of the neural tube forms sensory neurons in the dorsal horn of the grey matter?
What part of the neural tube forms motor neurons in the ventral horn of the grey matter?
What does the innermost layer of the neural tube develop into?
What do the neural crest cells give rise to?
DRG, adrenal medulla, melanocytes, enteric ganglia, schwann cells, sympathetic ganglia
What CNS cell is mesodermally derived?
Where does the spinal cord begin and end?
Foramen magnum and L1/L2 in an adult
What are the 2 enlargements of the cord?
Cervical and lumbosacral
Where is the cervical enlargement largest?
What is the dilated end of the spinal cord?
What are nerves that exit the end of the spinal cord called?
What is structures of the cord are derived from pia mater?
Dentate ligaments, filum terminale
What is the function of the dentate ligaments?
They anchor the cord to the dura
Where is the filum terminale internum?
From conus medullaris to the end of the dural sac
Where is the end of the dural sac?
Where is the filum terminale externum?
anchored to the coccyx, continuous witht he coccygeal ligament
What are fasciculi?
Fast conducting white matter that ascend and descend
What spinal tracts are associated with 2 point discrimination, vibration, and joint position sense?
Cuneatus and gracilis tracts
Where do cuneatus and gracillis cross
In the medulla
What is the destination of a third order neuron in tracts gracilis and cuneatus?
VPL of the thalamus
What do cuneatus and gracilis tracts differ in control of?
Which set of limbs
Between cuneatus and gracilis, which tract controls upper limbs?
What two spinal tracts are collectively known as the "anterolateral" system?
Ventral and lateral spinothalamic tracts
What type of information is carried by the spinothalamic tracts?
Crude pressure, nociception, and thermoreceptors
Where do the spinothalamic tracts cross?
In the cord