Okay, let's tackle this question. The question is about a lesion causing the inability to perceive the texture and shape of an object. Hmm. So, the key here is understanding which sensory pathway is responsible for that.

First, I remember that the somatosensory system has different pathways. The dorsal column-medial lemniscus pathway is for fine touch, vibration, and proprioception. But the question mentions texture and shape, which are part of discriminative touch. Wait, discriminative touch is part of the dorsal columns. But wait, there's also the lateral spinothalamic tract for pain and temperature. That's not it here.

Wait, the question is about texture and shape. Oh, right! The posterior columns are involved in conscious proprioception, but the lateral spinothalamic tract is for pain and temperature. But texture and shape perception might be part of the dorsal column-medial lemniscus pathway. Wait, no. Let me think again. The posterior columns carry fine touch, vibration, and proprioception. But the lateral spinothalamic tract carries crude touch and pain. So, maybe the question is about the lateral spinothalamic tract? No, because texture and shape perception are more refined and require the dorsal columns.

Wait, but there's also the anterolateral system, which includes the spinothalamic tracts. The lateral spinothalamic tract is for pain and temperature, and the anterior for crude touch. So, if the lesion is in the dorsal columns, the patient would lose fine touch, vibration, and proprioception. But the question is about texture and shape, which are part of discriminative touch. So, that's the dorsal columns. So, a lesion in the dorsal columns would cause the inability to perceive these qualities. Therefore, the correct answer is a lesion in the dorsal column-medial lemniscus pathway.

Let me check the options again. The user hasn't provided the options, but the correct answer is D. So, assuming the options are something like D. Dorsal column-medial lemniscus pathway. The other options would be other pathways like lateral spinothalamic, etc. The incorrect options would be the ones related to other pathways. So, the explanation would be that the dorsal columns are responsible for discriminative touch, including texture and shape. Lesions here would lead to the inability to perceive these. The other options are for different sensations. The clinical pearl is to remember that the posterior columns handle fine touch and discriminative touch, while the anterolateral system handles pain and crude touch.

**Core Concept**
The inability to perceive texture and shape of an object indicates a deficit in *discriminative touch*, which relies on the **dorsal column–medial lemniscus pathway**. This pathway transmits fine touch, vibration, and proprioceptive information via large myelinated Aβ fibers, enabling conscious discrimination of tactile stimuli.

**Why the Correct Answer is Right**
The dorsal column–medial lemniscus pathway is critical for processing **texture, shape, and two-point discrimination**. Lesions in this pathway (e.g., tabes dorsalis, syringomyelia, or spinal cord injury) disrupt the transmission of fine tactile information from mechanoreceptors (e.g., Meissner’s and Pacinian corpuscles) to the thalamus and

✓ Correct Answer: D. Nucleus cuneatus