Spinal cord

Question 1

Lamina 1

Answer 1

most dorsal

contains few large perikarya and many small and medium sized neurons

Question 2

Lamina 2

Answer 2

substansia gelatinosa

small neurons

Question 3

Lamina 3 and 4

Answer 3

Nucleus proprius

few large perikarya and many small/medium sized neurons

Question 4

Laminae 5,6 and 7

Answer 4

medium sized neurons with transverse orientation of the dendritic tree
in intermediate zone

Question 5

Lamina 8

Answer 5

large neurons

medial aspect of anterior horn

Question 6

Lamina 9

Answer 6

large motoneurons and many medium sized neurons

lateral aspect of anterior horn

Question 7

Lamina 10

Answer 7

grey matter around central canal

Question 8

Sensory fibers in dorsal root entrance

Answer 8

Medial bundle:

• majority cranially in dorsal funiculus
• ascending branches gives collaterals, terminate in lamina 3 and 4
• some to gracile and cuneate nucleus, some to Clarkes column

Lateral bundle:

• small caliber nerve fibers
• bifurcate and goes up and down in Lissauer tract
• collateral branches to lamina 1 and 2 and 5