A scalp block aims to stop conduction in the following nerves:
Correct Answer: C
Rationale: A scalp block is used in awake craniotomy to provide regional anesthesia by blocking sensory nerves innervating the scalp. The greater occipital nerve supplies the posterior scalp, making it a key target. The zygomaticotemporal nerve innervates the temple area, and the auriculotemporal nerve covers the lateral scalp and ear region both are also commonly blocked. The infraorbital nerve supplies the midface, not the scalp, and the trochlear nerve (likely a misnomer for supraorbital or supratrochlear) innervates the forehead, another typical target. However, the greater occipital stands out as essential for posterior coverage, consistently cited in scalp block techniques. The rationale hinges on anatomical innervation: effective scalp anesthesia requires blocking nerves from both trigeminal (V1, V2, V3 branches) and cervical (C2, C3) origins, with the greater occipital being a primary cervical contributor, ensuring comprehensive pain control during surgery.