Development of Branchial Arches
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| What is the otic placode? | Part of ear...increased development of the ectoderm
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| Name the 5 arches | 1, 2, 3, 4 and 6 (Whatever was in arch 5 went a little into 4 and 6)
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| What are auricular hillocks? | Little bumps developing into the ear
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| Name anomalies of the external ear | Two auricular appendages (One gets removed). Rudimentary auricle (Microtia): Primitive ear without a opening
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| What does each arch contain? | Ectoderm, endoderm, cartilage and nerve
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| 1st arch: Bones | Mandible, incus and malleus
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| 1st arch: Arteries | Maxillary and part of external carotid
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| 1st arch: Nerve | Trigeminal
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| 1st arch: Muscles | Mylohyoid, anterior belly of digastrics, mastification muscles, tensor palantine and tensor tympani
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| 2nd arch: Bones | Upper hyoid bone (lesser part), stapes, styloid process
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| 2nd arch: Artery | Stapedial
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| 2nd arch: Nerve | Facial
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| 2nd arch: Muscles | Facial expression muscles, sylohyoid, posterior belly of digastric, stapedius
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| 3rd arch: Bone | Inferior part of hyoid (biggest part)
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| 3rd arch: Arteries | Common carotid and internal carotid
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| 3rch arch: Nerve | Glossophryngeal
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| 3rd arch: Muscle | Stylopharyngeus
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| 4th and 6th arch: Cartilage | Cartilage of larynx
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| 4th arch: Arteries | Aortic arch and right subclavian
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| 4th and 6th arch: Nerve | Vagus
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| 6th arch: Arteries | Pulmonary arteries and ductus arteriosus
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| 4th arch: Muscles | Levator veli palatine, superior & middle & inferior pharyngeal constrictors, cricothyroid
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| 6th arch: Muscles | Intrinsic muscles of larynx
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| 1st Pouch | Auditory tube for balance
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| 2nd Pouch | Framework for migrating cells to become palatine tonsil. Palatine fossa
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| 3rd Pouch | Inferior parathyroid glands and thymus
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| 4th Pouch | Ultimobranchial body and superior parathyroid glands
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| Describe the development of the thyroglossal duct | Thyroglossal duct will develop at base of tongue and thyroid gland develops at the end of it. It will disappear when the thyroid is where it needs to be. If it doesn't it can get trapped and cyst can develop
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