Devo Review Block B Flashcards
microstomia-
no lower jaw or tongue, tiny mouth. caused by excessive merging of mesenchyme in maxillary mandibular prominences
prosencephalon develops into ______ and _____
telencephalon and diencephalon
rhombencephalon develops into _____ and ______
metencephalon and myelencephalon
telencephalon derivative
cerebral hemispheres
diencephalon derivative
thalamus and hypothalamus
mesencephalon derivative
midbrain
metencephalon derivative
pons and cerebellum
myelencephalon derivative
medulla
cervical flexure-
level where medulla is continuous with the spinal cord
midbrain flexure-
between mesencephalon and prosencephalon
pontine flexure-
divides rhombencephalon into myelencephalon and metencephalon
what flexure is responsible for opening up ventricular system?
pontine flexure
what keeps the motor and sensory plates separate?
sulcus limitans
smooth brain-
lissencephalic
anencephaly results when
anterior neuropore fails to close
_______ is where anterior neuropore was located developmentally
lamina terminalis
microcephaly-
small cranial vault
obstructive hydrocephalus in infants can be caused by
congenital aqueductal stenosis
skull base is formed via
endochondral bone formation
neurocranium is formed via
intramembranous bone formation
what fontanelles exist
anterior, posterior, mastoid, and sphenoid
what suture may persist in front of skull
metopic suture
premature fusion of sutures-
craniosynostosis
syndromes associated with craniosynostosis
saethre-chotzen, crouzon, apert, pfeiffer
fused saggital suture will result in
scaphocephaly
fused metopic suture will result in
trigonocephaly
unilateral fused coronal suture will result in
plagiocephaly
bicoronal suture fusion will result in
turricephaly
lamboid suture fusion will result in
plagiocephaly
structures formed from 1st arch cartilage
malleus, incus, anterior ligament of malleus, and sphenomandibular ligament
structures formed from 2nd arch cartilage
stapes, styloid process, stylohyoid ligament, lesser cornu/superior part of hyoid
structures derived from 3rd arch cartilage
rest of the hyoid bone
structures derived from 4th/6th arch cartilages
laryngeal cartilages (except for epiglottic)
muscles derived from 2nd arch
stapedius, stylohyoid, posterior belly of diagastric, muscles of facial expression
muscles derived from 4th/6th arches
cricothyroid, levator veli palatini, constrictors of pharynx, palatoglossus, intrinsic muscles of larynx
derivatives of 1st pharyngeal pouch
tubotympanic recess, tympanic cavity, mastoid antrum, pharyngotympanic tube
derivative of 2nd pharyngeal pouch
tonsillar fossa
derivates of 3rd pharyngeal pouch
thymus and inferior parathyroid gland
derivatives of 4th pharyngeal pouch
superior parathyroid gland and ultimopharyngeal body
thyroid gland comes from
endodermal thickening on floor of pharynx (not from 2nd pouch)
thyroid ________ begins to descend neck as the thyroglossal duct
diverticulum
________ from median tongue bud is overgrown by _______
- medial lingual swelling
- lateral lingual swelling from distal tongue buds
point of fusion of 2 distal tongue buds-
medial sulcus
posterior 1/3 of tongue develops from
3rd pharyngeal arch
what are circumvallate papillae innervated by
CN IX
what gives rise to epiglottis?
rostral part of hypopharyngeal eminence
what is the only laryngeal cartilage not formed by the fusion of the 4th and 6th arches
epiglottic cartilage
type 1 and 2 cysts refer to
first branchial cleft cysts
second branchial cleft cysts communicate with
region of 2nd pharyngeal pouch
third branchial cleft cysts pierce the ______ and enters the _______.
thyrohyoid membrane and enter the larynx
lateral nasal prominence becomes
alae of nose
median nasal prominences fuse to form
intermaxillary segment
maxillary prominences are separated from lateral nasal prominence by ________
nasolacrimal groove (which will form nasolacrimal duct)
if maxillary prominence and lateral nasal prominence dont fuse right, ________ results
oblique nasal cleftq
stomodeum-
opening of future oral cavity
most critical period of development of the palate is from when to when?
end of 6th week to beginning of 9th week
the eye has developmental contributions from what germ layers?
neural ectoderm, superficial ectoderm, and mesoderm
evagination of the diencephalon
optic vesicle
2 parts of pars caeca-
pars iridica and pars ciliaris
mesoderm of eye gives rise to what 4 strucutes?
stroma, ciliary body, choroid and sclera
what 2 things can be caused by maternal rubella?
congenital glaucoma and congenital cataract
failure of optic vesicles to form
anopthalmia
congenital absence of lens
aphakia
failure of eyelids to form
cryptopthalmos
the tubotympanic recess from the 1st pouch gives rise to
tympanic cavity, pharyngotympanic tube, and mastoid antrum
what cartilages give rise to the middle ear bones and muscles?
meckel’s and reichart’s
what eye structures are generated from both mesoderm and superficial ectoderm?
eyelids and cornea`
the pigmented layer of the retina stimulates the development of what 2 things
choroid and sclera
the photosensitive retina stimulates the _____ to become the _____
lens vesicle to become the lens
the optic vesicle stimulates the _____ to become the _____
lens ectoderm to become the lens placode
the lens vesicle stimulates the generation of
corneal epithelium
endoderm from the first pharyngeal pouch will develop into ____
tubotympanic recess
tubotympanic recess will develop into ____ and ______
tympanic cavity (which gives rise to mastoid) and pharyngotympanic tube
the mesoderm of the inner ear gives rise to (5)
semicircular canals, perilymphatic space, scala vestibuli, scala tympani, and cochlea
the mesoderm of the middle ear gives rise to (5)
malleus, incus, tensor tympani, stapes, stapedius m.
the ectoderm of the inner ear gives rise to the otic pit–> otic vesicle—> 3 things:
endolymphatic duct (becomes endolymphatic sac), utricule and saccule
utricle gives rise to–>
ampullae
saccule gives rise to–>
cochlear duct
