▁of ▁ap at ite . ▁ ▁In ▁the ▁grey ▁organ ic ▁mass ▁at ▁the ▁neck ▁base , ▁mus cle ▁fib res ▁are ▁present ▁that ▁have ▁been ▁identified ▁as ▁belonging ▁to ▁the ▁Mus cul us ▁stern oh yo ide us ▁and ▁the ▁Mus cul us ▁stern ot rache alis . ▁Between ▁the ▁sixth ▁and ▁sevent h ▁d ors al ▁verte bra ▁a ▁patch ▁of ▁mus cle ▁fib res ▁is ▁visible ▁belonging ▁to ▁either ▁the ▁Mus cul us ▁trans vers osp inal is ▁or ▁the ▁Mus cul us ▁long iss im us ▁d ors i . ▁In ▁front ▁of ▁the ▁right ▁is ch ium ▁mus cle ▁fib res ▁are ▁present ▁running ▁from ▁the ▁is ch ial ▁foot ▁in ▁the ▁direction ▁of ▁the ▁fem ur . ▁Their ▁identity ▁is ▁uncertain : ▁they ▁could ▁belong ▁to ▁the ▁Mus cul us ▁pub o isch io f emor alis ▁par s ▁med ial is ▁( the ▁Mus cul us ▁ad duct or ▁fem oris ▁I ▁of ▁cro cod iles ) ▁but ▁in ▁that ▁case ▁this ▁mus cle ▁with ▁( some ) ▁non - av ian ▁ther op ods ▁would ▁not ▁be ▁anch ored ▁on ▁the ▁obt ur ator ▁process . ▁The ▁fib res ▁could ▁also ▁represent ▁an ▁unknown ▁mus cle . ▁In ▁any ▁case ▁they ▁ref ute ▁a ▁conject ure ▁by ▁Gregory ▁S . ▁Paul ▁that ▁there ▁would ▁be ▁no ▁mus cle ▁connection ▁between ▁the ▁is ch ium ▁and ▁the ▁fem ur ▁at ▁all . ▁A bove ▁the ▁rect um ▁tract ▁a ▁large ▁area ▁of ▁horizontal ▁un segment ed