Somatic Nervous System

Question 1

What are the major types of neurons?

Answer 1

Bipolar
Multipolar
Pseudounipolar

Question 2

What are the 4 types g neuroglial cells found in the CNS?

Answer 2

Astrocyles
Microglial cells
Ependymal cells
Oligodendrocytes

Question 3

What is a dermatome?

Answer 3

Area of skin supplied by a single spinal nerve

Question 4

What is a myotome?

Answer 4

Part of muscle supplied by a single spinal nerve

Question 5

What is the clinical relevance of dermatome and myosome?

Answer 5

To test motor or sensory loss of one or more spinal nerve/segments by testing joint movements or an an area of skin in neurological disorders

Question 6

What is a motor end plate?

Answer 6

Neuromuscular junction

Question 7

What is the function of the somatic MOTOR fibres?

Answer 7

Regulates voluntary control of body movements via skeletal muscles

Question 8

What is the function of somatic SENSORY fibres?

Answer 8

Transmits general sensation (pain, touch, temperature,) to the CNS

Question 9

what are the implications of damage to the spinal nerve?

Answer 9

Damage to the:
Anterior root - causing MOTOR loss
Posterior root - causing SENSORY loss
Spinal nerve - both sensory and motor loss
Ventral ramus - motor ans sensory loss of anterolateral trunk and limbs
Dorsal ramus: motor and sensory loss of the back

Question 10

What does the spinal nerve exit through?

Answer 10

Intervertebral foramen

Question 11

What is a somatic reflex arc?

Answer 11

• sensory detection
• interpretation of sensory input in the CNS
• motor response