<prompt> Posterior belly of digastric develops from:1st arch2nd arch3rd arch4th arch  <response>: Ans: B 2nd arch Ref. BDC, 4 ed, Vol. III p. 289Anterior belly of digastric is derived from the 1sl arch, while the posterior belly develops from the 2nd arch.ARCHNERVEMUSCLESSTRUCTURESFROM CARTILAGE1stMandibularMedial pterygoidLateral PterygoidMasseterTemporalisMylohyoidAnt. Belly of DigastricTensor tympaniTensor palate Merckels cartilageMalleusIncus2ndFacialMuscles of facialexpressionPlatysmaStylohyoidOccipitofrontalisPosterior belly of DigastricStapediusReicherts cartilageStapesStyloid processStylohyoid ligamentSmaller horn of HyoidSup. part of body of Hyoid3rdGlossopharyngealStylopharyngeusGreater cornu of hyoidLower part of body of hyoid4thSuperior laryngeal nerveMuscles of pharynx and larynxCartilages of larynx6thRecurrent laryngeal nerveMuscles of pharynx and larynx 