Question

How are cranial nerves and spinal nerves similar? How are they different?

2. What components come together to form a spinal nerve? What’s the difference between a dorsal root, ventral root, dorsal primary Ramos,and ventral primary ramus? What type of fibers, sensory or motor, are found in each of these structures?

3. At what level is a spinal tap performed. From an embryological stand point why is this possible?

4. What is the embryological basis for most NTDs? Can they be diagnosed prenatally? Are there any means of prevention?

5. Prenatal ultrasound reveals an infant with an enlarged and expansion of both lateral ventricles. What is this condition called and what might have caused it?

6. What are the two parts of the ANS? Where are their respective preganglionic neurons located? What cells give rise embryologically to their postganglionic neurons?

Answer 1

Answer 1:

Cranial nerves	Spinal nerves
They directly come from brain and brain stem	They come out from nerve root of spinal cord
There are 12 pairs of cranial nerves	There are 31 pairs of spinal nerves
It is named and numbered as CN1 to CN12	It is numbered in different groups: 8 cervical nerve, 12 thoracic nerves, 5 lumbar nerve, 5 sacral nerve, 1 coccygeal nerve
It supplies to head, neck and face	It supplies to all the body parts
They are sensory or motor or neuron	They are both sensory and motor
They form dorsal and ventral root	They do not form dorsal or ventral root