development of the CNS

Question 1

what cells are present at the dorsal section (alar plate) of developing spinal cord surrounding the canal

Answer 1

interneurones (most information goes up to brain via different tracts depending on sensory input; excl. simple reflex)

Question 2

what cells are present at the ventral section (basal plate) of developing spinal cord surrounding the central canal

Answer 2

motor neurones and interneurones (simple reflex is just sensory input to alar plate and motor response from basal plate)

Question 3

where are neural crest cells located and what do they form

Answer 3

located outside of main tubes (incl. alar and basal plates) and form sensory neurones in dorsal root ganglion

Question 4

structure of mature spinal cord: dorsal

Answer 4

central canal is in the middle; dorsal horn (grey matter) -> dorsal root -> heads ventrally to dorsal root ganglion -> meets ventral root in ventral section

Question 5

structure of mature spinal cord: ventral

Answer 5

central canal is in the middle; ventral horn (grey matter) -> ventral root -> meets just after dorsal root ganglion in ventral section

Question 6

what is just outside between the dorsal and ventral horns

Answer 6

white matter