Dorsal column of spinal cord does not carry fibres of
**Core Concept:**
The dorsal column of the spinal cord is a group of white matter tracts located on the dorsal side of the spinal cord. These columns are responsible for transmitting information related to proprioception (body position sense) and vibration sensation. The dorsal column pathway includes the spinothalamic tract that conveys pain and temperature information, and the ventral column, which carries information about touch and pressure.
**Why the Correct Answer is Right:**
The correct answer is D, which states that the dorsal column of the spinal cord does not carry fibers of pain and temperature. This is because the spinothalamic tract, a part of the dorsal column pathway, is responsible for transmitting pain and temperature information. Other options, A, B, and C, mention specific sensory modalities (Vibration, proprioception, and touch/pressure) and the ventral column, which are correct as these modalities are carried by the dorsal column.
**Why Each Wrong Option is Incorrect:**
A) Option A is incorrect because the dorsal column carries fibers involved in proprioception and vibration sensation, which are not mentioned in this option.
B) Option B is incorrect because the dorsal column carries fibers related to proprioception and vibration sensation, as mentioned above.
C) Option C is incorrect because the dorsal column carries fibers related to proprioception and vibration sensation, not touch and pressure.
**Clinical Pearl / High-Yield Fact:**
Understanding the role of the dorsal column pathway is crucial in understanding sensory information processing and localization of symptoms in neurological examinations. Disturbances in the dorsal column pathway can lead to sensory loss involving proprioception, vibration, and temperature sensitivity, which is known as "Dorsal column syndrome" or "Wallerian degeneration." This condition occurs when there is damage to the dorsal columns, typically due to spinal cord injuries or lesions. The clinical presentation includes ataxia (incoordination), dysmetria (exaggerated reflexes), and dysdiadochokinesis (inability to perform rapid alternating movements).
**Correct Answer:** D