Head and neck dev Flashcards
membrane that will become mouth
oropharyngeal membrane
ant. space similar to proctodeum
stomatodeum
cause of dev. of frontonasal prominence
proliferation of mesoderm and neural crest cells
organs derived by mesoderm and neural crest cells
mesoderm- skeletal muscle and epithelial cells
crest cells- bone and connective tissue of face and ganglia of head and neck
number of arches back from prominence
6
contents of each arch (4)
- artery
- cartilege
- muscle
- cranial nerve
portions that dev into face and palate
frontonasal prominence and 1st arch
divisions of 1st arch
maxiallary and mandibular prominences
pit in between all the prominences
stomatodeum
what will become the nose
olfactory placodes>olfactory pits
what is formed from mandibular prom
jaw
what creates primary palate
medial nasal prominence
separation between lat nasal and max prominence
nasolacrimal groove > nasolacrimal duct
derivatives of frontonasal prominence
forehead, nasal bridge, nasal sept
derivatives of medial nasal prom
primary palate, philtrum of upper lip, tip of nasal septum
derivatives of lat nasal prom
ala of nose
derivatives of max prom
maxilla and lat upper lip
derivatives of mandibular priom
jaw and lower lip
prob with medial nasal and max fusion
cleft lip
prob with max and mandibular fusion
macrostomia
prob with lat nasal and max fusion
oblique facial cleft
2 sources of palate
- medial nasal - promiary palate (ant.)
2. palatal process of maxilla - post palate including soft
arch # and corresponding cranial nerve
1 - 5
2 - 7
3 - 9
4 - 10
prominences developed by trigeminal
V1 - frontonasal
V2 - maxiallary
V3 - mandibular
external and internal division of arches
external - pharyngeal grooves
internal - pharyngeal pouch
fate of 4 pharyngeal grooves
- becomes auditory meatus
2-4. covered by caudal drift of 2nd arch to become cervical sinuses
fate of 4 pharyngeal pouches
- middle ear chamber and auditory tube
- palatine fossa
- ventral - thymus, dorsal - inf parathyroid glands
- dorsal - sup parathyroid glands, ventral become calcitonin secreting aspect of thyroid
tissues creating tympanic membrane
ectoderm of 1st pharyngeal groove meeting endoderm of 1st pharyngeal pouch
fate if cartilage of 4 arches
- Meckle’s - mandible, sphenomandibular ligament, malleus, incus
- Reicherts - stapes, styloid process, lesser horn of hyoid
- greater horn of hyoid
- laryngeal cartiledges
muscles of 4 arches
- muscles of mastication, mylohyoid, anterior digastric, tensor tympani, tensor palatini
- muscles of facial expresion, posterior digastric, stylohyoid, stapedius
- stylopharyngeus
- levator palatini, muscles of pharynx and larynx
arteries of the 4 arches
- none
- none
- common carotids and proximal internal carotid
- left- aortic arch, right - subclavian
- none
- pulmonary arteries
point of origin of thyroid
b/w 1 and 2 arches
point of dev of pit cland (2)
ant. - ectoderm in roof of stomatodeum
post - outgrowth of neuroectoderm of neural tune near hypothalamus
arches where tongue develops from
ant 2/3 - 1st arch (trigeminal)
post 2/3 - 3 and 4 (glosso and vagus)
skeletal muscle from somites
arteries of the 4 arches
- none
- none
- common carotids and proximal internal carotid
- left- aortic arch, right - subclavian
- none
- pulmonary arteries
point of origin of thyroid
b/w 1 and 2 arches
point of dev of pit cland (2)
ant. - ectoderm in roof of stomatodeum
post - outgrowth of neuroectoderm of neural tune near hypothalamus
arches where tongue develops from
ant 2/3 - 1st arch (trigeminal)
post 2/3 - 3 and 4 (glosso and vagus)
skeletal muscle from somites
tissue source for thyroid
endoderm b/w arches
which pouch becomes ant. pit
rathkes pouch (ectoderm)
time thyroid reaches final position
7th week
passage through which thyroid descends
thyroglossal duct (midline)
