Embryology Flashcards
five facial swellings
1) frontonasal process
2/3) paired maxillary processes
4/5) paired mandibular processes
medial nasal processes develop into
intermaxillary prominence
cleft lip results from ________
cleft lip results from FAILURE OF INTERMAXILLARY PROMINENCE (fusion of medial nasal proceses) TO FUSE WITH MAXILLARY SWELLING
primary palate formed by _______
primary palate formed by INTERMAXILLARY SEGMENT OF NASAL PROCESS
secondary palate formed by ___________
secondary palate formed by:
PALATINE SHELVES from maxillae grow inward to fuse in midline
flat bones of the skull form from
condensation of mesenchymal tissue (INTRAMEMBRANOUS OSSIFICATION) which originally derives from the neural crest
each arch contains
- cartilagenous component
- muscular component
- an aortic arch
- a nerve
arch 1 innervation
CN V
arch 2 innervation
CN VII
arch 3 innervation
CN IX
arch 4 innervation
CN X
arch 6 innervation
CN X
arch 1 : artery, skeletal, muscles, CN
- Maxillary artery
- incus, malleus, maxilla, zygomatic, squamous temporal, mandible
- m. of mastication, accessory m of mastication
- CN V (maxillary and mandibular div)
arch 2: artery, skeletal, muscles, CN
- stapedial artery, corticotympanic a
- stapes, styloid process, stylohyoid ligament, upper part of hyoid bone
- muscles of facial expression, posterior digastric, tyolohyoid, stapedius
- CN VII
arch 3: artery, skeletal, muscles, CN
- common carotid a
- lower part of hyoid
- stylopharyngeus
- CN IX
arch 4: artery, skeletal, muscles, CN
- arch of aorta, R subclavian a
- laryngeal cartilages
- constrictors of pharynx, cricothyroid, levator veli palatini
- CN X (superior laryngeal br)
first cleft
external acoustic meatus
cervical cysts/sinuses can arise from ________
cervical cysts/sinuses can arise from incomplete obliteration of remaining clefts
first pouch
middle ear cavity
second pouch
palatine tonsillar bed
third pouch
inferior parathyroid gland and thymus
fourth pouch
superior parathyroids
parafollicular cells of thyroid
branchial cleft cyst: failure of obliteration of _________
branchial cleft cyst: failure of obliteration of SECOND branchial cleft in emryonic development
inferior parathyroid gland is dragged down with _________ from _________ pouch
inferior parathyroid gland is dragged down with THYMUS from THIRD pouch
derivatives of neural crest
- components of eye
- dermal bones of skull
- pharyngeal arch cartilages
- dermis/hypodermis of face and neck
- odontoblasts
- some cranial nerve ganglia
- adrenal medulla
- melanocytes
- dorsal root and chain ganglia
sensory to mucosa of anterior 2/3 tongue
arch 1
-lingual n (CN V3)
taste buds in anterior 2/3 of tongue
arch 2
-chorda tympani (CN VII)
taste/general sensation in posterior 1/3 of tongue
arch 3
-glossopharyngeal n (CN IX)
taste/sensation from epiglottis
arch 4/6
-vagus n (CN X)
muscles of tongue formed from _______
muscles of tongue formed from OCCIPITAL SOMITES
NOT pharyngeal arches
arch 6: artery, skeletal, muscles, CN
- ductus arteriosus, roots of pulmonary arteries
- laryngeal cartilages
- instrinsic muscles of the larynx
- recurrent laryngeal branch of vagus (CN X)