Branchial Arches Simplified

                                                                   
                                                      BRANCHIAL ARCHES

            

  There are six pharyngeal arches but in humans the fifth arch only exists transiently during embryonic  growth and development.Since no human structures result from the fifth arch ,the arches in human 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 trachea.

Pharyngeal Arch	Muscular Contributions	Skeletal Contributions	Nerve	Artery	Corresponding Pouch Structures
1st (Mandibular Arch)	1)Muscles of mastication 2)Anterior belly of the  digastric 3)Mylohyoid 4)Tensor Tympani 5)Tensor veli Palatini	1)Maxilla 2)Mandible(only as a model for mandible not actual formation of mandible) 3)Incus and Malleus 4)Meckels Cartilage 5)Anterior ligament of malleus 6)Sphenomandibular ligament	Trigeminal nerve (V2 and V3)	1)Maxillary artery 2)External carotid artery	1)Eustachian tube 2)Middle ear 3)Mastoid antrum 4)Inner layer of tympanic membrane
2nd (Hyoid Arch)	1)Muscles of facial expression 2) Buccinator 3)Platysma 4)Stapedius 5)Stylohyoid 6)Posterior belly of digastric	1)Stapes 2)Styloid process 3)Hyoid bone(lesser horn and upper part of body) 4)Reicherts Cartilage 5)Stylohyoid ligament	Facial Nerve	Stapedial artery	1)Middle ear 2)Palatine tonsils
3rd	Stylopharyngeus	Hyoid(Greater horn and lower part of body)	Glossopharyngeal nerve	Common Carotid/ Internal Carotid	1)Inferior parathyroid 2)Thymus
4th	1) Cricothyroid muscle 2)All intrinsic muscles of soft palate including levator veli palatini	1)Thyroid cartilage 2)Epiglottic cartilage	1)Vagus nerve 2)Superior laryngeal nerve	1)Right Fourth Aortic arch: Subclavian Artery 3)Left 4th Aortic arch:Aortic arch	1)Superior Parathyroid 2)Ultimobranchial body Which forms the Para follicular C cells of thyroid gland)
6TH	All intrinsic muscles of larynx Except the cricothyroid muscle	1)Cricoid cartilage 2)Arytenoid cartilage 3)Corniculate cartilage	1)Vagus nerve 2)Recurrent Laryngeal nerve	1)Right 6th Aortic arch:Pulmonary artery 2)Left 6th aortic arch: Pulmonary artery and ducts arteriosus	1)Rudimentary structure becomes the part of the fourth pouch contributing to thyroid C-cells.

So Friends,all that you need to know regarding the branchial arches is presented above in a nutshell.
Refer this when you are preparing your embryo section.


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