Final answer:
Cranial nerves I to XII include sensory, motor, and mixed nerves with functions ranging from smell and vision to eye movement and facial expressions. Each nerve's number corresponds to its anatomical order, with I being olfactory and XII being hypoglossal.
Step-by-step explanation:
Order and Functions of Cranial Nerves
The cranial nerves, numbered using Roman numerals from I to XII, are as follows: olfactory (CNI), optic (CNII), oculomotor (CNIII), trochlear (CNIV), trigeminal (CNV), abducens (CNVI), facial (CNVII), vestibulocochlear (CNVIII), glossopharyngeal (CNIX), vagus (CNX), spinal accessory (CNXI), and hypoglossal (CNXII). The I, II, and VIII nerves are purely sensory, controlling smell, vision, and hearing/balance respectively. Nerves III, IV, and VI are strictly motor, managing eye movement. XI and XII are also solely motor, affecting neck and tongue muscles respectively. The remaining CNV, CNVII, CNIX, and CNX are mixed, serving both sensory and motor functions, such as facial sensation/movement and taste/swallowing.