Intro

Question 1

What is membrane potential?

Answer 1

The difference in electrical potential between the interior and exterior of a cell

Question 2

What two things are important to transfer nerve impulses from one nerve to another?

Answer 2

Synapses and neurotransmitters

Question 3

Once the dorsal and ventral root fuse to join a spinal nerve, where abouts does it leave from?

Answer 3

intervertebral foramen

Question 4

In relation to the vertebrae, where abouts do the corresponding spinal nerves leave?

Answer 4

cranial to the vertebrae up until C7, there is a C8 spinal nerve but no c8 vertebrae so the spinal nerves leave caudally from here

Question 5

How does the neural tube form?

Answer 5

• The notochord signals the ectoderm above to thicken
• this forms the neural plate
• the neural plate folds and fuses cranial to caudal
• neural crest cells below distribute across the tube

Question 6

Name some tissue derived from the neural crest (3)

Answer 6

• schwann cells
• ANS
• endocrine tissue

Question 7

Embryologicaly what structures are the meninges derived from?

Answer 7

Dura matter from the paraxial mesoderm surrounding the neural tube and Pia arachnoid is derived from neural crest cells.