Embryology Flashcards
Pharyngeal arch
N: V- maxillary and mandibular
Muscles: mastication (temporal, masseter, medial, lateral pterygoids); mylohyoid, anterior belly digastric, tensor palatine, tensor tympani
CAP
clefts- ectoderm
arches- mesoderm
pouches- endoderm
Pharyngeal pouch: 1
Tympanic (middle ear) cavity, auditory (eustachian) tube
Pharyngeal pouch: 2
Palatine tonsils, tonsillar fossa
Pharyngeal pouch: 3
Inferior parathyroid gland, thymus
Pharyngeal pouch: 4
Superior parathyroid gland ultimobranchial body (parafollicular C cells of the thyroid gland)
Fate of 1st cleft
external auditory meatus
Fate of 2, 3, 4 cleft
obliterated by overgrowth of the 2nd arch and 4th arch toward each other forming a cervical sinus (if persists forms the branchial cyst or fistula)
Pharyngeal arch: 2 Hyoid
N: Facial
M: facial expression (buccinator, auricularis, frontalis, platysma, orbicularis oris and oculi), p. belly digastric, stylohyoid, stapedius
Pharyngeal arch: 3
N: glossopharyngeal
M: stylopharyngeus
Pharyngeal arch: 4
Superior laryngeal branch
M: cricothyroid, levator palatine, constrictors of pharynx
Pharyngeal arch: 6
Recurrent laryngeal branch
M: Intrinsic muscles of larynx
Midline cyst
Thyroglossus cyst
Lateral cyst
Brachial cyst
Truncus asteriosus
Aorta
Pulmonary trunk
Bulbus cordis
Smooth part of right and left ventricle
Primitive ventricle
Rough part of right and left ventricle
Primitive atrium
Rough part of right and left atrium
Sinus venosus
Smooth part of right atrium, coronary sinus, oblique vein of left atrium
Foramen ovale
Shunt between right atrium and left atrium, during fetal life pressure is higher in right atrium versus left atrium causing blood to flow from right to left
Tetralogy of Fallot
Pulmonary stenosis
Right ventricular hypertrophy
Overriding aorta
Ventricular septal defect (VSD)
(marked cynosis)- oxygenated mixing with deoxygenated blood
Patent foramen ovale
Incomplete fusion of septum primum & septum secundum
3rd aortic arch
Common carotid and most of internal carotid
4th aortic arch
Left: aortic arch
Right: subclavian artery
6th aortic arch
Left: ductus arteriosus, left pulmonary artery
Right: right pulmonary artery