Seven functional components of the cranial nerves >general somatic efferent fiber (GSE):striated muscles involved in eye (Ⅲ，V、M)and tongue(XⅫ >general visceral efferent fiber (GVE):preganglionic parasympathetic fiber travel withinⅢ，VL,x,X >special visceral efferent fiber (SVE):striated muscles derived from the branchial arches involved in chewing (V),making facial expressions(VII), swallowing (IX.X),producing vocal sounds(X)and turning the head (X1) general somatic afferent fiber (GSA):sensation from skin,mucous membrane travel within V,VIl,IX,X general visceral afferent fiber (GVA):sensation from all viscera Ix,x special visceral afferent fiber (SVA):smell (I)and taste (VI,IX,X) ▣special somatic afferent fiber (SSA:visual(Ⅱ)，hearing and equilibrium(Ⅷ) general somatic efferent fiber (GSE): striated muscles involved in eye (Ⅲ , Ⅳ、Ⅵ ) and tongue (Ⅻ)  general visceral efferent fiber (GVE): preganglionic parasympathetic fiber travel within Ⅲ , Ⅶ, Ⅸ , Ⅹ  special visceral efferent fiber (SVE): striated muscles derived from the branchial arches involved in chewing (Ⅴ), making facial expressions (Ⅶ ), swallowing (Ⅸ、Ⅹ), producing vocal sounds (Ⅹ) and turning the head (Ⅺ)  general somatic afferent fiber (GSA): sensation from skin, mucous membrane travel within Ⅴ, Ⅶ, Ⅸ, Ⅹ  general visceral afferent fiber (GVA): sensation from all viscera Ⅸ, Ⅹ  special visceral afferent fiber (SVA): smell (Ⅰ) and taste (Ⅶ, Ⅸ, X)  special somatic afferent fiber (SSA): visual(Ⅱ), hearing and equilibrium (Ⅷ) Seven functional components of the cranial nerves