• Pharyngeal cleft: Ectoderm (Mnemonic: c = c)
• Pharyngeal arch: Mesoderm
• Pharyngeal pouch: Endoderm (Mnemonic: u = n)
|
Pharyngeal |
Arterial derivative |
|
1st arch |
Maxillary artery (Terminal br of ECA) |
|
2nd arch |
1. Hyoid artery (Superior thyroid artery branch) 2. Stapedial artery (Posterior auricular artery branch) |
|
3rd arch |
1. Common carotid artery 2. Internal carotid artery (1st part) |
|
4th arch |
1. Right side- Rt. Subclavian artery (Dysphagia lusoria) 2. Left side- Arch of aorta |
|
5th arch |
x |
|
6th arch |
1. Right side- Rt. Pulmonary artery 2. Left side- Lt. Pulmonary artery (Ductus arteriosus) |
ECA - External Carotid artery
• Dysphagia lusoria- Proximal part of Right 4th arch artery (Rt. Subclavian artery)
• Ductus arteriosus- Distal part of Left 6th arch artery (Lt. Pulmonary artery)