Craniofacial Embryology Flashcards
when do head and neck develop
weeks 4-8
what embryonic structure do the head and neck develop from
pharyngeal apparatus
pharyngeal apparatus is sometimes called
branchial apparatus
3 components of pharyngeal apparatus
clefts, arches, pouches
on what day do the 5 pairs of pharyngeal arches start to form
22
what separates the pharyngeal arches externally
clefts
what are pharyngeal clefts composed of
ectoderm
what separates pharyngeal arches internally
pouches
what are pharyngeal pouches composed of
endoderm
outer covering of pharyngeal arch is composed of
ectoderm
inner lining of pharyngeal arch is composed of
endoderm
core of pharyngeal arch is composed of
mesenchyme derived from mesoderm and neural crest
what elements of pharyngeal arch are derived from neural crest
cartilage, connective tissue, and arch-associated cranial nerve
what elements of pharyngeal arch are derived from mesoderm
skeletal muscle and an aortic arch artery
2 components of first pharyngeal arch
maxillary process, mandibular process
maxillary process becomes
maxilla, zygomatic bones
mandibular process becomes
mandible, middle ear structures (incus, malleus)
incus and malleus are derived from what embryonic structure
Meckel’s cartilage
what skeletal muscles are derived from first pharyngeal arch
muscles of mastication, anterior digastric, mylohyoid, tensory tympani, anterior 2/3 of tongue
what cranial nerve is associated with first pharyngeal arch
mandibular and maxillary divisions of trigeminal nerve
what artery is associated with first pharyngeal arch
portion of maxillary
what embryonic structure is derived from second pharyngeal arch
Reichart’s cartilage
What does Reichart’s cartilage give rise to?
stapes bone, styloid process of temporal bone, part of the hyoid bone
what skeletal muscles are derived from second pharyngeal arch
muscles of facial expression, stapedius, stylohyoid, posterior digastric
what cranial nerve is associated with second pharyngeal arch
facial nerve
what embryonic arteries are derived from second pharyngeal arch and what artery does one of them become
stapedial and hyoid (becomes branch of internal carotid)
bones formed from third pharyngeal arch
part of hyoid
muscles formed from third pharyngeal arch
stylopharyngeus
arteries formed from third pharyngeal arch
common carotid arteries and proximal internal carotid arteries
cranial nerve associated with third pharyngeal arch
glossopharyngeal
4th and 6th pharyngeal arches share what nerve
vagus
4th arch is associated with what branch of vagus nerve
superior laryngeal
6th arch is associated with what branch of vagus nerve
recurrent laryngeal
4th and 6th arches fuse to form
laryngeal cartilages and muscles
list the laryngeal cartilages
thyroid, cricoid, arytenoid, corniculate, cuneiform
4th arch forms what muscles
cricothyroid, levator palatini, pharyngeal constrictors
6th arch forms what muscles
intrinsic muscles of larynx except cricothyroid
4th arch artery becomes
arch of aorta on left and proximal right subclavian
6th arch artery becomes
proximal pulmonary arteries and ductus arteriosus
derivatives of first pharyngeal cleft
external auditory meatus, external part of tympanic membrane
derivatives of first pharyngeal pouch
internal part of tympanic membrane, tympanic cavity, and eustachian tube