Topic 6 Nervous System: Nerves

Question 1

• All nerves not directly inside the brain or spinal cord are part of the PNS
• Cranial and spinal nerves come out of those structures, meaning they originate in the CNS, but their axons extend beyond the brain and spinal cord, and are thus considered part of the PNS
• There are 12 pairs of cranial nerves and are categorized as sensory, motor, or mixed.
• There are 31 pairs of spinal nerves divided among the sections for the vertebral column

Answer 1

Note

Question 2

• Extends from medulla oblongata and innervates parts of the heart, lungs, stomach, intestines, and liver

Answer 2

1. Vagus Nerve

Question 3

• Innervates lower limbs and pelvis

Answer 3

2. Sciatic Nerve

Question 4

• Serves the somatic muscles surrounding the eyes

Answer 4

3. Abducens Nerve

Question 5

• Serves structures surrounding the eyes and scalp

Answer 5

4. Supraorbital Nerve