Nerve (*)

Question 1

The CNS contains

Answer 1

the brain and spinal cord

Question 2

The PNS contains

Answer 2

nerves and ganglia

Question 3

Afferent neurons are for ______ while efferent neurons are ________

Answer 3

sensory, motor

Question 4

sensory nerves are further subdivided into what two componants?

Answer 4

somatic and viseral

Question 5

motor neurons are further subdivided into what two componants

Answer 5

voluntary somatic and involuntary automatic componants

Question 6

Most neurons, including all motor neurons and CNS interneurons, are ________

Answer 6

multipolar

Question 7

______ -______include sensory neurons of the retina, olfactory mucosa, and inner ear

Answer 7

Bipolar neurons

Question 8

All other sensory neurons are ______ or ___________

Answer 8

unipolar or pseudounipolar

Question 9

______-_______ of the CNS lack true axons and do not produce action potentials, but regulate local electrical changes of adjacent neurons.

Answer 9

Anaxonic neurons

Question 10

What which triggers neurotransmitter release into the synaptic cleft?

Answer 10

Upon arrival of a nerve impulse, voltage-regulated Ca2+ channels permit Ca2+ entry

Question 11

what are the 3 types of synapses?

Answer 11

1. axosomatic
2. Axodendritic
3. Axoaxonic

Question 12

astrocytes

Answer 12

star-shaped glial cell of the central nervous system, little cytoplasm and more elongated or oval nuclei

Question 13

______________ have condensed, rounded nuclei and unstained cytoplasm due to very abundant Golgi complexes, which stain poorly

Answer 13

oligodendrocytes

Question 14

_________ cells are epithelial-like cells that line the ventricles and central canal

Answer 14

Ependymal

Question 15

_______cells have a protective, phagocytic, immune-related function. Two glial cells occur in the PNS

Answer 15

microglial

Question 16

______cells, also called ___________, form a series ensheathing axons

Answer 16

Schwann, neurolemmocytes

Question 17

________ cells are restricted to ganglia where they cover and support the large neuronal cell bodies

Answer 17

Satellite

Question 18

__________ are the most abundant glial cells of the CNS and are characterized by numerous cytoplasmic processes

Answer 18

Astrocytes

Question 19

what is the Schmidt-Lanterman or myelin clefts?

Answer 19

The axon is enveloped by the myelin sheath, which, in addition to membrane, contains some Schwann cell cytoplasm in spaces between the major dense lines of membranes.

Question 20

what is the role of schwan cells in unmeyelated nerves?

Answer 20

1. schwann cells envelope multiple axons

2. unmeyelated axons are enveloped by the schwann cell but there are no myelin sheath wraps around each axon