**Core Concept**
Cell adhesion molecules (CAMs) play a crucial role in the formation and maintenance of neuronal synapses during embryogenesis. These molecules facilitate cell-to-cell interactions, which are essential for the proper development and organization of the nervous system. The correct CAMs involved in this process are integral to the complex interactions between neurons and glial cells.

**Why the Correct Answer is Right**
The correct answer involves the CAMs N-Cadherin and L1CAM. N-Cadherin is a transmembrane glycoprotein that mediates cell-to-cell adhesion through homophilic interactions, allowing for the proper formation of synaptic connections. L1CAM, on the other hand, is a transmembrane glycoprotein that is involved in neuronal migration and axon guidance during embryonic development. Both N-Cadherin and L1CAM are critical for the establishment of functional synapses and the overall development of the nervous system.

**Why Each Wrong Option is Incorrect**
* **Option A:** Integrins are a family of cell adhesion molecules that play a crucial role in cell-extracellular matrix interactions, but they are not directly involved in neuronal synaptic development.
* **Option B:** Selectins are a family of cell adhesion molecules that are primarily involved in leukocyte recruitment and inflammation, not neuronal development.
* **Option D:** NCAM (Neural Cell Adhesion Molecule) is indeed involved in neuronal development, but it is not the correct answer as it is a broader category that includes other CAMs, whereas N-Cadherin and L1CAM are specific examples of CAMs involved in synaptic development.

**Clinical Pearl / High-Yield Fact**
Keep in mind that disruptions in CAM function or expression have been implicated in various neurological disorders, including autism spectrum disorder and schizophrenia. Understanding the role of CAMs in neuronal development is essential for appreciating the underlying pathophysiology of these conditions.

**Correct Answer: B. L1CAM**