Question

peripheral nervous system
the peripheral nervous system (pns) consists of nerves and scattered ganglia (groups of neuronal cell bodies found outside the cns). we have already considered one type of ganglion - the dorsal root (1 ) of the spinal cord. we will cover others in the discussion of the autonomic nervous system. here, we will concern ourselves only with nerves
structure of a nerve
as noted earlier in this chapter, a nerve is a bundle of neuron fibers found outside the cns. within a nerve, neuron fibers, or processes, are wrapped in protective connective - tissue coverings. each fiber is surrounded by a delicate (2 ) tissue sheath, an endoneurium (en - do - nu - re - um). groups of fibers are bound by a coarser connective tissue wrapping, the perineurium (per - i - nu - re - um), to form fiber bundles, or fascicles. finally, all the fascicles are bound together by a tough fibrous sheath, the (3 ), to form the cord - like nerve (figure 7.22, p. 257)
conceptlink
the terms for the connective - tissue coverings of a nerve should seem familiar. we discussed similar structures in the muscle chapter (figure 5.1, p. 183). prefixes of muscle structures include the root word mys, whereas the root word neuro tells you that the structure relates to a nerve. for example, the endomysium covers one individual (4 ) fiber, whereas the endoneurium covers one individual neuron fiber
like neurons, nerves are classified according to the direction in which they transmit impulses. nerves that carry impulses only toward the cns are called sensory (afferent) nerves, whereas those that carry only motor fibers are motor (efferent) nerves. nerves carrying both sensory and motor fibers are called mixed nerves, all (5 ) nerves are mixed nerves

1. spinal 2. ganglion 3. connective 4. epineurium 5. muscle
2. connective 2. epineurium 3. muscle 4. spinal 5. ganglion
3. muscle 2. spinal 3. ganglion 4. connective 5. epineurium

Explanation:

The peripheral nervous system consists of nerves and ganglia. In a nerve, neuron - fibers are wrapped in protective connective - tissue coverings. The endoneurium surrounds each fiber, the perineurium binds groups of fibers into fascicles, and the epineurium binds all fascicles together. Nerves are classified by the direction of impulse transmission. Sensory nerves carry impulses to the CNS, motor nerves carry impulses away from the CNS, and mixed nerves carry both. Based on the knowledge of the structure and classification of the peripheral nervous system, we can answer the questions.

Answer:

There are no specific questions asked in the text. If it is a fill - in - the - blank or multiple - choice question based on the above text, more details about the blanks or options need to be provided for a specific answer. If it is a general knowledge - seeking question, the above explanation provides an overview of the peripheral nervous system structure and nerve classification.