A
– includes several layers of the lemmocyte plasma membrane; B – has lipoprotein
organization with lipid predominance; C
– contains nucleus and organelles of Schwann
cell; D
– is formed by mesaxon winding around the axis cylinder; E – possesses Schmidt-
Lanterman clefts.
13. Each of the following statements concerning the receptors is true, EXCEPT:
A
– are terminal modifications of sensory neuron dendrites; B – are the motor nerve
endings; C
– if they contain only nerve fibres, they are free; D – if they contain glial cells,
they are nonfree; E
– if they are enclosed by connective tissue capsules, they are
encapsulated.
14. Each of the following statements concerning the lamellar (Pacinian) corpuscle is
true, EXCEPT:
A
– is a deep pressure receptor; B – contains the inner flask with a sensory fibre; C –
contains the outer flask from glial cells; D
– is the motor nerve ending; E – possesses
connective tissue capsule from multiple layers.
Directions
: one or more of the given statements or completions is/are correct. Choose the
answer: A
– if only 1,2, and 3 are correct; B – if only 1 and 3 are correct; C – if only 2 and
4 are correct; D
– if only 4 is correct; E – if all are correct.
15. According to the morphological classification the neurons are:
(1) multipolar (2) bipolar (3) pseudounipolar (4) sensory
16. According to the functional classification the neurons are:
(1) sensory (2) motor (3) associative (4) bipolar
17. In embryogenesis the CNS and PNS neurons develop from:
(1) mesenchyme (2) neural tube (3) mesoderm (4) neural crest
18. In embryogenesis the CNS and PNS glial cells arise from:
(1) neural tube (2) neural crest (3) mesenchyme (4) mesoderm
19. The following statements regarding the dendrites are true:
(1) are numerous or single (2) conduct impulses toward the soma (3) have spines (4) have
extensive arborizations
20. The following statements regarding the axon are true:
(1) is always single (2) is the longest and thickest neuronal process 3) branches to form
collaterals (4) branches at its end
21. The chemical synapses transfer impulses in one direction because:
(1) their presynapse has vesicles with a neurotransmitter (2) they are nexuses (3) their
postsynaptic membrane has receptors (4) they are only exciting
22. The following statements regarding the regeneration of the nervous tissue are
true:
(1) neurons are unable to divide (2) glial cells can divide (3) neuron processes can
regenerate (4) the neuronal soma can regenerate after injury
23. The following statements regarding the glial cells are true:
(1) take part in neuron nutrition (2) participate in regeneration of nerve fibres (3) form a
protective barrier around neurons (4) maintain electrolyte balance
24. The glial cell functions are:
(1) support and defence of neurons (2) transport of substances from blood (3) formation of
nerve fibre sheaths (4) conduction of nervous impulses
25. The following statements regarding the unmyelinated fibres are true:
(1) contain several axis cylinders (2) their sheaths are formed by lemmocytes (3) conduct
impulses at a rate of 8 -10 m/s (4) possess nodes of Ranvier
26. The following statements regarding the node of Ranvier are true:
(1) lacks myelin (2) is the site between adjacent Schwann cells (3) provides saltatory
conduction of nervous impulses (4) contains Schwann cell nucleus
27. The following statements regarding the Schmidt-Lanterman cleft are true: