ANAT 1502 Embryology Chapter 10, 11, 12

ANAT 1502 Embryology Chapter 10, 11, 12 - Chapter 11:...

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Chapter 11: Pharyngeal Apparatus Pharyngeal arches formed from Neural crest cells Table 11-1 from book: Structures derived from Pharyngeal Arches o NB: 5 th arch regresses o NB: Cartilaginous components of 4 th and 6 th arches fuse to form Laryngeal cartilage o NB: Circulation provided by branches off the dorsal aorta Arch Nerve Muscles Skeletal structures Ligaments First arch (mandibular) Trigeminal nerve Mastication muscles, mylohyoid and anterior belly of digastric, tensor tympani, tensor veli palatine Malleus Incus Anterior ligament of malleus Sphenomandibular ligament Second arch (hyoid) Facial nerve Muscles of facial expressions Stapedius Stylohyoid Posterior belly of digastric Stapes Styloid process Lesser cornu of hyoid Gupper part of body of hyoid bone Stylohyoid ligament Third arch Glossopharyngeal nerve Stylopharyngeus Greater cornu of hyoid Lower part of body of hyoid bone Fourth arch and Sixth arch Superior laryngeal branch of Vagus Recurrent laryngeal branch of Vagus Cricothyroid Levator veli palatine Constrictors of pharynx Intrinsic muscles of larynx Striated muscles of esophagus Thyroid cartilage Cricoid cartilage Arytenoid cartilage Corniculate cartilage Cuneiform cartilage Pharyngeal arches separated externally by Pharyngeal Grooves o Only the first pair remain to form External acoustic meatus (all others disappear) Pharyngeal arches separated internally by Pharyngeal Pouches o 1 st pouch forms: tympanic cavity, mastoid antrum, pharyngotympanic tube o 2 nd pouch forms: palatine tonsil o 3 rd pouch: thymus, parathyroid glands o 4 th pouch: parathyroid glands, thyroid gland (parafollicular cells) Pharyngeal membranes (formed by contact between pharyngeal groove and pouch) o Only the first pair remain to form tympanic membranes (all others disappear) Specific Organ developments o Thyroid Gland First endocrine gland to develop Endodermal thickening forms small outpouching called thyroid diverticulum This is connected to the tongue by the narrow thyroglossal duct
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This note was uploaded on 11/21/2011 for the course ANAT 1502 taught by Professor Johnh.romfh during the Spring '10 term at Life Chiropractic College West.

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ANAT 1502 Embryology Chapter 10, 11, 12 - Chapter 11:...

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