Embryology Flashcards
What are the 3 division of mesoderm?
- paraxial
- intermediate
- lateral plate
What day does pharyngeal arch 1 develop?
- day 22
What day does pharyngeal arch 2 and 3 develop?
- day 24
What day does pharyngeal arch 4 and 6 develop?
- day 29
What pharyngeal arch is not present in human embryos?
- arch 5
Each pharyngeal arch has its own?
- cranial nerve
- artery
- cartilage
Pharyngeal clefts are found on the ___ectoderm/endoderm__ surface?
- ectoderm
- clefts cover!
What cranial nerve is associated with pharyngeal arch 1?
- CN V
- trigeminal
What are the 2 processes of pharyngeal arch 1?
- maxillary process ( CN V2)
- Mandibular process ( CNV3)
The maxillary process of pharyngeal arch 1 is responsible for what?
- maxilla
- zygomatic bone
The mandibular process of pharyngeal arch 1 is responsible for what?
- Meckel’s cartilage
- incus
- malleus
- mandible
- squamous region of temporal bone
What are the muscular derivatives of pharyngeal arch 1?
- muscles of mastication
- Tensor veli palatini
- Tensor tympani
- Mylohyoid
- Anterior belly of digastric
What cranial nerve is associated with pharyngeal arch 2?
- CN VII
- facial nerve
What is the skeletal derivatives of pharyngeal arch 2?
- Stapes
- Styloid process of temporal bone
- Stylohyoid ligament
- Lesser horn of hyoid
- Upper part of hyoid body
What are the muscular derivatives of pharyngeal arch 2?
- Muscles of facial expression
- Posterior belly of digastric
- Stylohyoid
- Stapedius
- Auricular muscles
What cranial nerve is associated with pharyngeal arch 3?
- CN IX
- Glossopharyngeal
Skeletal derivatives of pharyngeal arch 3?
- Greater horn of hyoid bone
- Lower part of hyoid bone
Muscular derivatives of pharyngeal arch 3?
- Stylopharyngeus
Cranial nerve associated with pharyngeal arches 4 and 6?
- CN X
- Vagus
Skeletal derivatives of pharyngeal arches 4 and 6?
- laryngeal cartilages
Muscular derivates of pharyngeal arches 4 and 6?
o Levator veli palatini o Salpingopharyngeus o Palatoglossus o Palatopharyngeus o 3 Pharyngeal constrictors o Cricothyroid o Intrinsic muscles of the larynx
What is the final development of the pharyngeal clefts?
- cleft 1 = tympanic membrane
- cleft 2-4 = cervical sinus
Where are cervical cysts typically found?
- along the sternocleidomastoid
What is the tympani membrane formed from?
- diverticulum between pharyngeal pouch 1 and pharyngeal cleft 1
