Exam 3

Question 1

Sensory neurons versus motor neurons?

Answer 1

Sensory= info to spinal cord
Motor= info away from spinal chord

Question 2

How many cranial nerves are there and where do they come from?

Answer 2

12, from the brain

Question 3

How many spinal nerves are there and where do they come from?

Answer 3

31, from the spinal chord

Question 4

Neurons versus neuroglia?

Answer 4

Neurons= sends impulses/APs
Neuroglia= supportive cells, don’t send impulses

Question 5

Somatic versus autonomic nervous system?

Answer 5

Somatic= voluntary control
Autonomic = involuntary (contains sympathetic and parasympathetic)

Question 6

Afferent versus efferent neurons?

Answer 6

Afferent= receptors to CNS
Efferent= CNS to effectors

Question 7

What are the three neuron types?

Answer 7

1: sensory (Afferent neurons conduct APs towards CNS)
2: motor (efferent neurons conduct APs away from CNS)
3: interneuron (conduct APs within CNS from 1 neuron to the next)

Question 8

What are the four possible number of dendrites found on a neuron?

Answer 8

1: Anaxonic neuron= no axon, just dendrites (no true AP, brain, and retina)-BRAIN-
2: Pseudo-unipolar= one process splits into two branches (peripheral dendrites and central)- SENSORY-
3: bipolar = two processes, dendrite and axon. (Retina, nasal, ear.)- SENSORY-
4: multipolar= many dendrites and axon (motor neurons of PNS) -MOTOR-

Question 9

What are the four types of neuroglia found in the CNS?

Answer 9

1: astrocytes (blood brain barrier guard)
2: ependymal cells (line ventricles, choroid plexus-make CSF)
3: microglial cells (immune cells, phagocytic)
4: oligodendrocytes (form myelin sheath in CNS)

Question 10

What are the two types of Neuroglia found in the PNS?

Answer 10

1: Schwan cells (form Myelin sheath in PNS)
2: satellite cell (support/nutrition. Protect from heavy metals, lead and mercury. “ armor for neuron”