▁of ▁the ▁body ▁of ▁the ▁fib ula ; ▁from ▁the ▁upper ▁part ▁of ▁the ▁inter os se ous ▁memb rane ; ▁from ▁the ▁deep ▁surface ▁of ▁the ▁fas cia ; ▁and ▁from ▁the ▁inter mus cular ▁sept a ▁between ▁it ▁and ▁the ▁tib ial is ▁anterior ▁on ▁the ▁med ial , ▁and ▁the ▁per one al ▁mus cles ▁on ▁the ▁later al ▁side . ▁Between ▁it ▁and ▁the ▁tib ial is ▁anterior ▁are ▁the ▁upper ▁port ions ▁of ▁the ▁anterior ▁tib ial ▁vessels ▁and ▁deep ▁per one al ▁n erve . ▁ ▁The ▁mus cle ▁passes ▁under ▁the ▁superior ▁and ▁inferior ▁ext ensor ▁ret in ac ul um ▁of ▁foot ▁in ▁company ▁with ▁the ▁fib ular is ▁t ert ius , ▁and ▁div ides ▁into ▁four ▁sli ps , ▁which ▁run ▁forward ▁on ▁the ▁d ors um ▁of ▁the ▁foot , ▁and ▁are ▁inserted ▁into ▁the ▁second ▁and ▁third ▁ph al anges ▁of ▁the ▁four ▁less er ▁to es . ▁ ▁The ▁tend ons ▁to ▁the ▁second , ▁third , ▁and ▁fourth ▁to es ▁are ▁each ▁joined , ▁opposite ▁the ▁met at ars oph al ange al ▁art ic ulations , ▁on ▁the ▁later al ▁side ▁by ▁a ▁tend on ▁of ▁the ▁ext ensor ▁dig itor um ▁bre vis . ▁The ▁tend ons ▁are ▁inserted ▁in ▁the ▁following ▁manner : ▁each ▁receives ▁a ▁f ibr ous ▁expansion ▁from ▁the ▁inter os se i ▁and ▁lum br ical s , ▁and ▁then ▁spread s ▁out ▁into ▁a ▁broad ▁ap one u ros is ,