Flashcards in development of head and neck Deck (49)
what membrane becomes the mouth?
review: whats philtrum?
the dimple between your upper lip and septum of nose; its made of the frontonasal process
what four things are contained in a pharyngeal arch?
arch cartilage, arch cranial nerve, arch artery, condensation of mesenchymal tissue that will make the muscles
what arch does malleus and incus come from
trigeminal innervates the little muscle that tenses the tympanic membrane, so this is first arch
what arch does stapes come from
stapedius attaches to this. that muscle is VII, so this is second pharyngeal arch
what does PHA mean? PHP?
for me, it means pharyngeal arch and pharyngeal pouch. i'm tired of typing them
what are the divisions of the hind brain? does the midbrain and forebrain divide?
rhombomeres; this is only in the hindbrain
what are the divisions of the paraxial mesoderm?
these are somitomeres for mm. of the eye. its the name for proximal somites
name for bulges that come off the gut tube?
pharyngeal pouches. like the lung bud, thyroid bud
T/F there is a blood vessel for each arch
what should you appreciate?
a lot of things up here come from neural crest (neural ectoderm that turns into mesoderm stuff) its really complicated, so don't learn this stuff but know it exists
why does recurrent laryngeal nerve (5th PHA) wrap around the subclavian(4th PHA)?
the 5th aortic arch disappeared
which part of the jaw fuses first?
what are the two parts of the skull that develop?
the neurocranium(skull part) and the viscerocranium (face part)
everything is cartilaginous for neurocranium except for?
parietal, frontal, and a little bit of the occipital
premature fusion of the coronal suture called? saggital?
t/f muscles of the tongue come from PHAs
false. they come from myotome
what are some weird things that neural crest cells form
melanocytes, all the ganglions, schwaan cells, meckel's cartilage (pha 1), dentine of teeth
a dense condensation of ectodermal tissue that gives rise to different strxs of the head and neck
pha 3 is what cn
pha 4,6 is what cn
which cns are actually from somitomeres/somites
III, IV, VI, XII
PHAs of hyoid
second (upper half), third (lower half)
first arch syndrome
low set ears, malformation of malleus and/or incus, small lower jaw, auricle of ear is misshapen
**subforms of this are treacher collins and goldenhar syndrome
no formation of the lower jaw
what chart do you need to know
the chart with arch, nerve, muscles, skeletal strxs, ligaments for PHAs
thyroid begins at this thing
prominences of the first PHA