What are the derivatives of the first and second branchial arches?
1. 1st branchial arch:
• Mandibular process: mandibular nerve, muscles of mastication, mylohyoid, anterior belly of digastric, tensor veli palatini, and tensor tympani muscles. Incus, malleus, part of mandible, sphenomandibular ligament
• Maxillary process: maxilla, palatine bone, vomer, maxillary nerve, zygomatic bone.
2. 2nd branchial arch:
• Facial nerve, muscles of facial expression, posterior belly of digastric, stylohyoid, stapedius muscles. Stapes, styloid process, stylohyoid ligament, lesser horn and upper portion of the body of the hyoid bone.