Lamina Quiz

Question 1

Lamina I

Answer 1

Thin cap over posterior horn

-Sensory function

Question 2

Lamina II

Answer 2

Approximate position of an important pain reception center called the ‘Substantia Gelatinosa’
-Pain synapses

Question 3

Substantia Gelatinosa

Answer 3

Name of an important pain reception center

Question 4

Lamina III, IV

Answer 4

Much of this area is filled with a group of cell bodies called the ‘Nucleus Proprius’
-Sensory info–> touch, pressure, tickle

Question 5

Lamina V

Answer 5

On the lateral edge of this lamina (cervical area only) is a complex of fibers and cell bodies known as the reticular formation of the cord
-This lamina is found on all cord levels

Question 6

Part of Lamina V that is only found in the cervical area

Answer 6

Reticular formation

Question 7

Lamina VI

Answer 7

Sends info to motor neurons and cerebrum (inside ant. horn)

• Responsible for spinal reflexes
• *Most anterior aspect of the posterior (dorsal) horn

Question 8

Lamina VII

Answer 8

• In the intermediate gray area (lateral horn included when present)
• -Many descending tract fibers synapse with neurons in this lamina
• –The nucleus dorsalis (Clarke’s Nucleus or Column)
• —Intermediolateral nucleus (intermediolateral cells)

Question 9

Nucleus Dorsalis (Clarke’s Nucleus)

Answer 9

• Extends like a column from cord level C8 down through L3.
• -These cell bodies contribute most axons to a famous ascending fasciculus called the Posterior Spinocerebellar Tract

Question 10

Intermediolateral nucleus (intermediolateral cells)

Answer 10

Again, a column-like nucleus, this time forming the bulk of the lateral horn cell bodies from T1-T12 of the cord.

• It appears, but without a distinct horn at cord levels L1,2 and S2,3,4.
• -These are the autonomic motor neurons known as preganglionic sympathetic (T1-L2) neurons and preganglionic parasympathetic neurons (S2,3,4)

Question 11

At S2,3,4 the nucleus in Lamina VII is often called

Answer 11

The Sacral Parasympathetic nucleus

Question 12

Lamina VIII

Answer 12

Most medial aspect of the anterior horn

-Delta motor neurons

Question 13

Lamina IX

Answer 13

Most of the body’s skeletal muscles are motor innervated from neurons in this lamina

• -It is the reason the ventral horn is called the “somatic motor horn”
• Class A alpha motor neurons are abundant here
• This layer is more like a series of disconnected islands than a true layer (lamina)

Question 14

Lamina X

Answer 14

Surrounds the Central Canal and contains the anterior and posterior ‘gray commissures’