▁which ▁covers ▁the ▁d ors al ▁surface ▁of ▁the ▁first ▁ph al an x : ▁this ▁ap one u ros is , ▁at ▁the ▁art ic ulation ▁of ▁the ▁first ▁with ▁the ▁second ▁ph al an x , ▁div ides ▁into ▁three ▁sli ps — an ▁intermediate , ▁which ▁is ▁inserted ▁into ▁the ▁base ▁of ▁the ▁second ▁ph al an x ; ▁and ▁two ▁coll ater al ▁sli ps , ▁which , ▁after ▁unit ing ▁on ▁the ▁d ors al ▁surface ▁of ▁the ▁second ▁ph al an x , ▁are ▁continued ▁on ward , ▁to ▁be ▁inserted ▁into ▁the ▁base ▁of ▁the ▁third ▁ph al an x . ▁ ▁Vari ations ▁This ▁mus cle ▁var ies ▁consider ably ▁in ▁the ▁modes ▁of ▁origin ▁and ▁the ▁arrangement ▁of ▁its ▁various ▁tend ons . ▁ ▁The ▁tend ons ▁to ▁the ▁second ▁and ▁fifth ▁to es ▁may ▁be ▁found ▁double d , ▁or ▁extra ▁sli ps ▁are ▁given ▁off ▁from ▁one ▁or ▁more ▁tend ons ▁to ▁their ▁corresponding ▁met at ars al ▁b ones , ▁or ▁to ▁the ▁short ▁ext ensor , ▁or ▁to ▁one ▁of ▁the ▁inter os se ous ▁mus cles . ▁ ▁A ▁s lip ▁to ▁the ▁great ▁toe ▁from ▁the ▁inn erm ost ▁tend on ▁has ▁been ▁found . ▁ ▁See ▁also ▁ ▁Ext ensor ▁dig itor um ▁bre vis ▁mus cle ▁ ▁Ext ensor ▁dig itor um ▁mus cle ▁ ▁Add itional ▁Im ages ▁ ▁References ▁ ▁External ▁links ▁▁▁▁ ▁P TC ent ral ▁ ▁Category : C alf ▁mus cles