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Branchial apparatus

Branchial arches

Branchial pouch 1 middle ear cavity, eustachian tube, mastoid air cells
Branchial pouch 2 epithelial lining of palatine tonsil
Branchial pouch 3 (dorsal) inferior parathyroids
Branchial pouch 3 (ventral) thymus
Branchial pouch 4 Superior parathyroids
Aberrant development of 3 and 4th pouches DiGeorge syndrome: leads to t cell deficiency (thymic aplasia) and hypocalcemia
Branchial arch 1 cartilage (Meckel's) Malleus, incus, sphenomandibular ligament, mandible
Branchial arch 2 cartilage (Reichert's) Styloid process, stapes, stylohyoid ligament, lesser horn of hyoid
Branchial arch 3 cartilage greater horn of hyoid
Branchial arch 4 and 6 cartilage epiglottic, thyroid cartilage, arytenoids, corniculate, cuneiform
Branchial arch 1 muscle Mylohyoid, (masseters, temporalis, lateral and medial pterygoids), anterior 2/3 of tongue, anterio digastric belly, tensor tympani, tensor veli palatini
Branchial arch 2 muscle Stylohyoid, posterior digastric belly, stapedius, muscles of facial expression
Branchial arch 3 muscle stylopharyngeus, poster 1/3 of tongue
Branchial arch 4 muscle cricothyroid, levator veli palatini, pharyngeal constrictors, posterior 1/3 of tongue
Branchial arch 6 muscle Intrinsic laryngeal muscles, no cricothyroid msucle,
Congenital pharyngocutaneous fistula associated with persistance of 3rd cleft and pouch (tonsillar area)
Treacher collins 1st arch neural crest fails to migrate --> mandibular hypoplasia, facial abnormalities
Cleft is made from what tissue derivative? ectoderm
Arch is made from what tissue derivative? mesoderm (muscles, arteries), neural crest (bones, cartilage)
Pouch is made from what tissue derivative? endoderm
Arch 1 (think of ___), 2 etc. 1 = chewing, 2 = facial expression, 3 = stylopharyngeus, 4 = swallowing, 6 = speaking
Superior laryngeal branch ___, Recurrent laryngeal branch ____ 4th arch, 6th arch
1st cleft external auditory meatus
2nd-4th cleft temporary cervical sinuses which are olbiterated by 2nd arch
Created by: ddecampo



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