Dorsal root nerve fibre injury at sacral region of spinal cord can cause:
**Core Concept**
Dorsal root nerve fibre injury at the sacral region of the spinal cord can cause damage to the afferent neurons that transmit sensory information from the pelvic organs, leading to a disruption in the normal function of these organs. This type of injury can result in autonomic dysfunction, specifically affecting the sacral spinal cord's control over the pelvic organs.
**Why the Correct Answer is Right**
The correct answer involves the understanding of the sacral spinal cord's role in controlling the pelvic organs. The sacral spinal cord, specifically the S2-S4 segments, is responsible for controlling the bladder, bowel, and reproductive organs. Damage to the dorsal root nerve fibres at this level can disrupt the normal function of these organs, leading to symptoms such as urinary retention, constipation, or impotence. The injury can also affect the autonomic nervous system's ability to regulate the pelvic organs, leading to an imbalance between the sympathetic and parasympathetic nervous systems.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the consequences of dorsal root nerve fibre injury at the sacral region. While the injury can cause autonomic dysfunction, it is not typically associated with muscle weakness or paralysis.
**Option B:** This option is incorrect because it is not a direct consequence of dorsal root nerve fibre injury at the sacral region. The injury can cause autonomic dysfunction, but it is not typically associated with seizures or other neurological symptoms.
**Option C:** This option is incorrect because it is not a direct consequence of dorsal root nerve fibre injury at the sacral region. The injury can cause autonomic dysfunction, but it is not typically associated with visual disturbances or other ocular symptoms.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that dorsal root nerve fibre injury at the sacral region can cause significant autonomic dysfunction, affecting the control of the pelvic organs. This type of injury can have a profound impact on a patient's quality of life, and it is crucial to diagnose and manage the condition promptly to prevent long-term complications.
**Correct Answer:** C. Autonomic dysfunction.