Embryology 1 Flashcards
When do the pharyngeal arches develop?
Week 4 and 5
Core of mesenchyme derived from paraxial and lateral plate mesoderm
Musculature of face
Neural crest cells form what?
Skeletal components of face
Nerve from arch 4
Superior laryngeal branch of vagus nerve
Nerve from arch 6
Recurrent laryngeal branch of vagus nerve
Skeletal components of the first arch
Maxillary process (dorsal portion) Mandibular process (ventral portion)
Arch 3
Glossopharyngeal nerve
Arch 2
Facial nerve
Arch 1
Trigeminal nerve (maxillary and mandibular divisons)
Glossopharyngeal nerve
Arch 3
Facial nerve
Arch 2
Trigeminal nerve
Arch 1
Superior laryngeal nerve
Arch 4
Recurrent laryngeal nerve
Arch 6
Contains maxilla, zygomatic and part of temporal bone
Maxillary process (dorsal portion) of 1st arch
Contains Meckel’s cartilage, incus, malleus and mandible
Mandibular process (ventral portion) of 1st arch
Muscles of mastication
Arch 1
Mylohyoid
Arch 1
Stapes, styloid process of temporal bone and stylohyoid ligament
Arch 2
Muscles of facial expression
Arch 2
Muscles of arch 3
Stylopharyngeus
Cricothyroid, levator palatini and pharyngeal constrictors
Supplied by superior laryngeal nerve (X)
Arch 4
Intrinsic laryngeal mm.
Supplied by recurrent laryngeal nerve (X)
Arch 6
Pouch 1
Middle ear
Eustachian tube
Tympanic membrane
Pouch 2
Palatine tonsil
Inferior parathyroid gland
Thymus
Pouch 3
Superior parathyroid gland Ultimobranchial body (C cells of thyroid gland)
Pouch 4
1st cleft
External auditory meatus
What do otic vesicles give rise to?
The inner ear
Urtricular portion of otic vesicle gives rise to what?
Semicircular canal
Saccular portion of otic vesicle gives rise to what?
Cochlea
