Final answer:
Cranial Nerves IV (Trochlear) and VI (Abducens) are both motor nerves that control eye movement functions and are part of the somatic nervous system, which is responsible for voluntary skeletal muscle movements.
Step-by-step explanation:
The student is inquiring about the functions of Cranial Nerves (CN) IV and VI. The tenth entry in the provided reference material explains that information carried by neurons can be either sensory or motor, and part of the somatic or autonomic nervous system. The functional roles of cranial nerves can be grouped into three categories: sensory, motor, or both. The mnemonic "Some Say Marry Money But My Brother Says Brains Beauty Matter More" helps to remember these roles. According to this mnemonic, CN IV (Trochlear) and CN VI (Abducens) are motor nerves. They are responsible for eye movements and fall under the category of the somatic nervous system.
The somatic nervous system is responsible for voluntary movements and involves skeletal muscles. The motor functions of CN IV and CN VI are associated with controlling the actions of specific eye muscles. In contrast, the autonomic nervous system (ANS) involves involuntary functions and is split into the sympathetic and parasympathetic systems, which are responsible for the body's fight-or-flight and rest-and-digest responses, respectively. However, CN IV and CN VI do not participate in the autonomic functions.