<prompt> All of the following develops from 2nd brachial arch EXCEPT:Buccinator7th cranial nerveAnterior belly of digastricStapes  <response>: ANSWER: C Anterior belly of digastricREF: Langmans Medical Embryology 9th edition Page 366, Table 15.1See APPENDIX-6 for Brachial archesAnterior belly of digastric develops from 1st brachial arch and posterior belly from 2nd brachial arch APPENDIX - 6Brachial ArchesThere are six pharyngeal arches, but in humans the fifth arch only exists transiently during embryologic growth and development. Since no human structures result from the fifth arch, the arches in humans are I, II, III, IV, and VI. The first three contribute to structures above the larynx, while the last two contribute to the larynx and tracheaPharyngealArchMuscularContributionsSkeletal ContributionsNerveArteryCorresponding Pouch Structures1stmandibulararchMuscles of mastication, Anterior belly of the digastric, Mylohyoid, Tensor tympani, Tensor veli palatiniMaxilla, mandible only as a model for mandible not actual formation of mandible, Incus and Malleus, Meckels cartilage, Ant. ligament of malleus, Sphenomandibular ligamentTrigeminal nerve V2 and V3Maxillary artery, external carotid arteryEustachian tube, middle ear, mastoid antrum, and inner layer of the tympanic membrane.2nd hyoid archMuscles of facial expression. Buccinator, Platysma, Stapedius, Stylohyoid, Posterior belly of the digastricStapes, Styloid process, hyoid lesser horn and upper part of body, Reicherts cartilage, Stylohyoid ligamentFacial nerve VIIStapedialArterymiddle ear, palatine tonsils3rdStylopharyngeusHyoid greater horn and lower part of body, thymusGlossopharyngeal nerve IXCommoncarotidInternalcarotidInferiorparathyroid,Thymus4thCricothyroid muscle, all intrinsic muscles of soft palate including levator veli palatiniThyroid cartilage, epiglottic cartilageVagus nerve X Superior laryngeal nerveRight 4th aortic arch: subclavian artery Left 4th aortic arch: aortic archSuperior parathyroid, ultimobranchial body which forms the Para follicular C-Cells of thyroid gland6thAll intrinsic muscles of larynx except the cricothyroid muscleCricoid cartilage, arytenoid cartilages, corniculate cartilageVagus nerve X Recurrent laryngeal nerveRight 6th aortic arch: pulmonary artery Left 6th aortic arch: Pulmonary artery and ductus arteriosusRudimentary structure, becomes part of the fourth pouch contributing to thyroid C-celts. 