Topic 4B

Question 1

Which type of matter is arranged into an H shape pattern?

Answer 1

Grey Matter

Question 2

What three nerves are most important ?

Answer 2

Spinal, Sciatic, Cranial

Question 3

What are the 4 nerve plexuses in the body?

Answer 3

• Cervical plexus
• Brachial plexus
• Lumbar plexus
• Sacral plexus

Question 4

What is a spinal nerve?

Answer 4

Spinal or nerve root is a name given to packages of neurons as they travel in the region of the intervertebral foramen.

Question 5

What is sciatic nerve?

Answer 5

where motor neurons originate in the spinal cord to certain muscles of leg

Question 6

What is the purpose of sensory neurons of the leg?

Answer 6

It carries information from the back of the leg toward the spinalcord

Question 7

What are cranial nerves?

Answer 7

Are motor neurons from the brain and travel to head/face muscles.

Question 8

What is the purpose of sensory neurons in the head

Answer 8

it carries info from various head and neck regions toward the brain.

Question 9

How are nerve roots named for the cervical?

Answer 9

The nerve root is named after the bone below it (the nerve root above c1 is called the c1 nerve root)

Question 10

How is the name of nerve roots of the thoracic different?

Answer 10

The nerve root below the bone is named after it because of the extra nerve root of the C8 (the nerve root below t1 is called the t1 nerve root)

Question 11

Where are motor neurons coming from?

Answer 11

They are coming from the opposite side of the brain

Question 12

Where are sensory neurons coming from?

Answer 12

They are coming from neurons of the skin

Question 13

Where is the cervical plexus extend to?

Answer 13

posterior head and neck

Question 14

Where is the brachial plexus extend to?

Answer 14

arm

Question 15

Where is the lumbar plexus extend to?

Answer 15

pelvic and anterior leg

Question 16

Where is the sacral plexus extend to?

Answer 16

posterior leg

Question 17

How many spinal nerves are there in total and in each spinal region?

Answer 17

31 pairs 
16 pairs(C1-C8)
12 pairs(T1-T12)
5 pairs(L1-L5)
5 pairs(S1-S5)
1 pair(coccyx)

Question 18

What symptom occurs when there is a compression of motor and sensory neurons?

Answer 18

numbness, muscle weakness

Question 19

Why sensory pathway is called the 3-neuron pathway?

Answer 19

1st order neuron(sensory receptor in skin), 2nd order neuron(spinal cord), 3rd order neuron(somatosensory or sensory cortex, post-central gyrus)

Question 20

Why motor pathway is called the 2-neuron pathway?

Answer 20

upper motor neuron(pre-central gyrus) and lower motor neuron(skeletal muscle cells)