embryology-arches
Terms
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- pharangeal arch components
- cartilage, muscle, nerves (maj+min), vessels
- arch grows back and buries other arches
- 2nd
- space beneath arch that grows back
- cervical sinus
- Area beneath arch doesnÂ’t disappear, causes:
- branchial/pharangeal cyst – can become infected/require removal
- branchial (pharangeal cyst) where?
- ANTERIOR to Sternocleidomastoid (otherwise – if posterior, lymph nodes: malignancy? lymphoma?)
- 2nd arch fuses where
- along ANTERIOR border of Sternocleidomastoid
- ears develop from
- neural crest cells
- Arch 1 nerve
- V3 (+chorda tympani of VII)
- Arch 1 muscles
- mastication
- Arch 1 bones
- mandible, plus upper parts of malleus/incus
- Chorda tympani nerve serves
- tast: anterior 2/3 of tongue
- Arch 2 nerve
- VII (+tympanic of IX)
- Arch 2 muscles
- facial expression
- Arch 2 bones
- styloid, lower malleus/incus, stapes, hyoid
- Little kids with facial abnormalities may be
- deaf (if Arch 1&2– face deforms, also ear ossicles)
- Arch 3 nerves
- IX (+auricular of X)
- Arch 3 muscles
- stylopharyngeus
- Arch 3 bones
- hyoid (lower part)
- Arch 4 nerves
- sup. laryngeal of X
- Arch 4 muscles
- larynx/pharynx
- Arch 4 bones
- larynx
- Arch 6 nerves
- recurrent laryngeal
- Arc 6 muscles
- larynx/pharynx
- Arch 6 bones
- larynx
- If short of neural crest cells = result?
- small mandible, hard of hearing
- tongue is
- epithelial bag of muscle
- tongue muscle derivation
- occipital bone somites
- tongue muscle innervation
- CN XII
- portion of tongue from arch 1
- lateral lingual swellings – tip of tongue
- portion of tongue from arch 2
- copula – connecting piece – is grown over by arch 3
- portion of tongue from arch 3
- hypobranchial eminence – posterior portion of tongue
- Anterior 2/3 of tongue arch and innervation
- 1st arch, V3 lingual nerve + taste: VII chorda tympani
- No nerve VII =
- No taste, no taste buds: buds need nerves 4 devel.