Final answer:
The question about the subtests comprising the Expressive Language Index relates to neurological exams, where language function is crucial in assessing expressive abilities. Damage to certain cerebral regions can affect verb or noun use, critical for expressive language.
Step-by-step explanation:
The student's question asks which subtests make up the Expressive Language Index. In the context of a neurological exam, two specific subtests address language: One measures the ability to understand language, and the other assesses the fluency and coherency of language through various tasks like generating descriptions and reciting sentences. These subtests are essential because language function is integral to many aspects of the exam. Details provided suggest that the neurological exam may include subtests for evaluating praxis and gnosis, which involve language components. Damage to specific cerebral areas such as the insula or the temporal lobes can result in V impairment (difficulty with verbs) or N impairment (difficulty with nouns), affecting expressive language abilities.