ENT embryology Flashcards
How many pharyngeal arches are there?
5 (Arch 1-6 [no 5th arch])
What does each pharyngeal arch consist of?
Core of mesenchyme
Nueral crst cels
CN component
Artery
What 2 components is the 1st pharyngeal arch split into?
Maxillary process
Mandibular process
What muscles are derived from the 1st pharyngeal arch?
Muscles of mastication, anterior belly of digastric mylohyoid, tensor tympani and tensor palatine
Which nerve is derived from the 1st pharyngeal arch?
Trigeminal nerve
What skeletal components are derived from the 2nd pharyngeal arch?
Stapes, styloid process of temporal bone + stylohyoid ligament
What muscles are derived from the 2nd pharyngeal arch?
Muscles of facial expression, stapedius, stylohyoid, posterior belly of digastric and aurical muscles
Which nerve is derived from the 2nd pharyngeal arch?
Facial nerve
Which muscle is derived from the 3rd pharyngeal arch?
Stylopharyngeus
Which nerve is derived from the 3rd pharyngeal arch?
Glossopharyngeal (IX) nerve
What muscles are derived from the 4th pharyngeal arch?
Cricthyroid
Levator palatin
Pharyngeal constrictos
Which nerve is derived from the 4th pharyngeal arch?
Superior laryngeal nerve
Which muscles are derived from the 6th pharyngeal arch?
Intrinsic laryngeal muscles
Which nerve supplies the muscle of arch 6?
Recurrent laryngeal nerve
What is hte external auditory meatus derived from?
1st pharyngeal cleft
