Kuehn - pharyngeal arch formation Flashcards
where do the pharyngeal arches begin
with the gut tube - as small columns on either side of embryonic pharynx
what 4 regions does the gut tube expand and differentiate into
pharynx, esophagus, stomach, and mid-gut
as the 1st arch bends around the oral plate, what are the 2 parts it forms
maxillary and mandibular divisions
how many pharyngeal arches are there
1, 2, 3, 4, and 6 (5 only exists in embryo growth and no structures arise from it)
what are the aortic arch derivatives and what arises from them
AA 3 - carotid, AA4- left arch aorta and right subclavian, and AA6 - pulmonary AA
what cranial nerves arise from PA1 maxillary division and PA2 mandibular division
maxillary of trigeminal and mandibular of trigemnial
what cranial nerve arises from PA2
facial nerve
what cranial nerve arises from PA3
glossopharyngeal nerve
what cranial nerve arises from PA4/6
vagus nerve
what muscle arises from PA1
muscles of mastication
what muscle arises from PA2
muscles of facial expression
what muscle arises from PA3
stylopharyngeus muscle
what muscle arises from PA4
cricothyroid and muscles of pharynx
what muscle arises from PA6
intrinsic muscles of larynx
what bone arises from PA3
hyoid bone
what bone/cartilage arise from PA4/6
cartilage of larynx (thyroid and cricoid cartilage)
what are the proximal parts of meckels cartilage
malleus and incus bones by endochondrial ossification
what is the middle part of meckels cartilage
sphenomandibular ligament
what are the distal parts of meckels cartilage
induces intra-membranous ossification around cartilage at mandible then disappears
what comes from Reicherts cartilage
stapes, styloid process, stylohyoid ligament and lesser horn of hyoid bone
what arises from the pharyngeal pouch 1
middle ear and auditory tube
what arises from the pharyngeal pouch 2
palatine tonsil
what arises from the pharyngeal pouch 3
parathyroid and thymus
what arises from the pharyngeal pouch 4/5
parathyroid, C-cells of thyroid
what arises from the pharyngeal groove 1
external auditory meatus
what do the pharyngeal grooves that fuse behind the 2nd arch form
cervical sinus
what happens if the cervical sinus forms but doesn’t involute
branchial cleft cyst forms - benign but can become infected
