Lecture 15

Question 1

How many neurons are required for the Sensory Pathway?

Answer 1

3 neurons
- Generated from the Spinal cord

Question 2

What sensations do the Lateral Spinothalamic tract pathway carry?

Answer 2

• Pain
• Temperature

Question 3

What sensations do the Anterior Spinothalamic tract pathway carry?

Answer 3

• Crude touch
• Pressure

Question 4

What sensations do the Dorsal Column Medial Lemniscal System pathway carry?

Answer 4

• Proprioception
• Two point Discrimination
• Vibration

Question 4

Where are the cell bodies of the first neuron located?

Answer 4

Within the dorsal root ganglia of the cervical spinal nerves

Question 5

Where do the axons from the Primary neurons enter and where does it synapse?

Answer 5

Axons enter the spinal cord and synapse with neurons in the dorsal horn of the cervical spinal cord

Question 6

Describe the path of the axons of the Secondary neurons

Answer 6

• Axons cross over to the opposite side
• Ascend in the lateral white matter of the cervical spinal cord as the spinothalamic tract

Question 7

What do the axons of the Secondary neurons form?

Answer 7

Part of the spinal lemniscus

Question 8

Describe the axons of the Tertiary neurons

Answer 8

Axons ascend through the internal capsule, to the primary sensory area of the cerebral cortex

Question 9

Which nerve is most of the sensory information carried by from the head?

Answer 9

Trigeminal nerve

Question 10

Where do sensory axons also travel within from the head?

Answer 10

• Facial nerve
• Glossopharyngeal nerve
• Vagus nerve

Question 11

Where are the cell bodies of the Primary neurons of the sensory pathway from the head located?

Answer 11

Within the Sensory Ganglia

Question 12

Where is the Trigeminal ganglion located?

Answer 12

Posterior to foramen ovale in the MCF

Question 13

What is the ganglion of the Facial nerve and where is it located?

Answer 13

• Geniculate ganglion
• Genu

Question 14

What is the ganglion of the Glossopharyngeal nerve and where is it located?

Answer 14

• Sensory ganglion
• Inferior to the jugular foramen

Question 15

What is the ganglion of the Vagus nerve and where is it located?

Answer 15

• Superior sensory ganglion
• Inferior to the jugular foramen

Question 16

Where do the axons of the Primary neurons of the sensory pathway from the head synapse?

Answer 16

With neurons within the nucleus of the spinal tract of Trigeminal Ganglion

Question 17

Where do the axons of the Secondary neurons of the sensory pathway from the head synapse?

Answer 17

In the ventral posterior nucleus of the thalamus

Question 18

Where do the Secondary neurons ascend as a part of?

Answer 18

The Trigeminal Lemniscus

Question 19

Describe the path of the Tertiary neurons

Answer 19

Axons ascend through the internal capsule, to the primary sensory area of the cerebral cortex

Question 20

How many neurons are required for the Motor Pathway?

Answer 20

2 neurons

Question 21

What does the motor pathway innervate?

Answer 21

Skeletal muscles

Question 22

What does the Corticospinal pathway control?

Answer 22

Body muscles

Question 23

Describe the 2nd neurons in the Corticospinal pathway

Answer 23

2nd Neurons are Spinal nerves

Question 24

Describe the 2nd neurons in the Cortico**bulbar** pathway

Answer 24

2nd Neurons are the **Cranial nerves with Motor function**

Question 25

Where are the Cell bodies for the Cortico**spinal** Pathway (Motor)?

Answer 25

Within the **Primary motor area**

Question 26

Describe the course of the axons in the Cortico**spinal** pathway (Motor)

Answer 26

1) Descend through **internal capsule** 2) Then to **cerebral peduncle** of midbrain 3) Then through **brainstem** 4) Then through the **pyramid**

Question 27

What are the axons called that **cross** the medulla oblongata?

Answer 27

Lateral corticospinal tract

Question 28

What are the axons called that **don't cross** the medulla oblongata?

Answer 28

Ventral corticospinal tract

Question 29

Where do the axons synapse in the cortico**spinal** pathway?

Answer 29

**Anterior horn** of the cervical spinal cord

Question 30

Where do the neurons in the spinal cord send the axons to?

Answer 30

**Spinal nerves** to the muscles

Question 31

What does the Cortico**bulbar** pathway control?

Answer 31

The muscles innervated by the **cranial nerves**

Question 32

Where are the Cell bodies for the Cortico**bulbar** Pathway (Motor)?

Answer 32

Within the **Primary motor area**

Question 33

Describe the course of the axons in the Cortico**bulbar** pathway (Motor)

Answer 33

1) Descend through **internal capsule** 2) Then to **cerebral peduncle** of midbrain 3) Then through **brainstem** 4) They **cross over** AND **also stay on the same side**

Question 34

What do the axons synapse with?

Answer 34

The **motor neurons**

Question 35

Where do the neurons in the brainstem send the axons to?

Answer 35

**Cranial nerves** to the muscles

Question 36

What are neck controlling muscles innervated by?

Answer 36

**Cervical spinal nerves** - Corticospinal pathway