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The given diagram represents the knee-jerk reflex which is a type of reflex action. Choose the option that correctly fills in all five blanks in the diagram.
| A | B | C | D | E |
| Dorsal root ganglion | White matter | Gray matter | Afferent Pathway | Efferent Pathway |
| A | B | C | D | E |
| Dorsal root ganglion | White matter | Gray matter | Efferent Pathway | Afferent Pathway |
| A | B | C | D | E |
| Dorsal root ganglion | White matter | Gray matter | Efferent Pathway | Afferent Pathway |
| A | B | C | D | E |
| Ventral root ganglion | White matter | Gray matter | Efferent Pathway | Afferent Pathway |
Answers (1)
As explained in the given diagram, the correct answer is option 2.
Dorsal root ganglion: It is a cluster of nerve cell bodies located in the dorsal root of the spinal nerve. The ganglion contains the cell bodies of sensory neurons, which transmit sensory information from the peripheral tissues to the central nervous system (CNS).
White matter: It refers to the regions of the nervous system that mainly consist of myelinated nerve fibers. These fibers form bundles called tracts or pathways that transmit information between different areas of the CNS. White matter gets its name from the white appearance due to the fatty myelin sheath covering the nerve fibers.
Gray matter: It refers to the regions of the nervous system that primarily consist of neuronal cell bodies, dendrites, and unmyelinated nerve fibers. Gray matter is involved in processing and integrating information within the CNS. It appears gray in color due to the absence of myelin.
Efferent pathway: It refers to the pathway through which nerve signals travel from the CNS to the effector organs, such as muscles or glands. Efferent pathways carry motor commands that initiate muscle contractions or glandular secretions. These pathways involve motor neurons.
Afferent pathway: It refers to the pathway through which sensory information travels from the peripheral tissues to the CNS. Afferent pathways carry sensory signals that include touch, pain, temperature, and other sensory modalities. These pathways involve sensory neurons.
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