Rexed Laminae

Question 1

What’s another name for Rexed Lamina II?

Answer 1

“Substantia Gelatinosa”

Question 2

What lamina is the most anterior portion of the dorsal horn?

Answer 2

R.L. VI

Question 3

What is the name of the fibers found in the cervical region?

Answer 3

“Formatio Reticularis”

“Reticular Formation”

Question 4

Cell bodies called “Nucleus Proprius” are located in which Rexed Lamina?

Answer 4

R.L. III and IV

Question 5

T/F? Lamina VII is found in the dorsal horn?

Answer 5

FALSE, Anterior/Ventral Horn

Question 6

When the lateral horn is present (so the T1-T12 spinal cord levels), what lamina will it be found in?

Answer 6

R.L, VII

Question 7

Many descending tract fibers synapse with neurons in what lamina?

Answer 7

R.L. VII

Question 8

Which lamina surrounds the central canal?

Answer 8

R.L. X

Question 9

What lamina is the most medial aspect of the ventral horn?

Answer 9

R.L. VIII

Question 10

What nuclei will you find in lamina VII?

Answer 10

“Nucleus Dosalis”, “Clark’s Nucleus”, or “Clark’s Column”

Question 11

Which lamina contains the terminal ventricle?

Answer 11

R.L. X

Question 12

Lamina IX contains what type of neurons?

Answer 12

Class A Alpha-Motor Neurons

Question 13

Which lamina is the reason that the ventral horn is called the “somatic motor horn”?

Answer 13

R.L. IX

Question 14

Which lamina contributes to the posterior Spinocerebellar Tract?

Answer 14

R.L. VII (Clark’s Nucleus)

Question 15

What lamina do pain fibers synapse in?

Answer 15

R.L. II (mainly)

Question 16

Where is R.L. I found?

Answer 16

Thin cap over the dorsal horn of the grey matter.

Question 17

What important area is found in R.L. II?

Answer 17

“Substantia Gelatinosa”

Question 18

What group of cell bodies mostly fills R.L. III and IV?

Answer 18

Nucleus Proprius

Question 19

In the cervical area, what complex of cell bodies are found in the lateral edge of R.L. V?

Answer 19

“Fromatio Reticularis”

Question 20

What is unusual about R.L. VI?

Answer 20

Sometimes missing

Question 21

In what part of the grey matter is R.L. VII found?

Answer 21

In the intermediate grey matter and lateral horn when present.

Question 22

What two important nuclei are found in R.L. VII and at what cord levels are they present?

Answer 22

Clark’s nucleus (nucleus dorsalis) = C8-L3

Intermediolateral nucleus = lateral horn T1-L2, no horn S2-S4

Question 23

The intermediolateral nucleus contains the cell bodies of what type of neurons?

Answer 23

Preganglionic, autonomic neurons

Question 24

R.L. IX contains an abundance of what type of neurons?

Answer 24

Class A Alpha-motor neurons

Question 25

Most of the bodies of skeletal muscles are motor innervated from neurons coming from what lamina?

Answer 25

R.L. IX (class A alpha-motor neurons)