Pharyngeal Arches Question And Answers

Pharyngeal Arches Question And Answers

Question 1. Derivatives of 1 pharyngeal arch. (or) Derivaties of first pharnyngeal arches.
Answer:

• First pharyngeal arch is called manidbular arch.

Skeletal derivative:

• Dorsal part- Gives rise to incus and malleus.
• Ventral part – Surrounded by developing mandible.
  • Part of it forms anterior ligament of the malleus and the sphenomandibular ligament.

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• Mesenchyme – Forms maxilla, mandible, zygomatic, bone, palatine bone and part of the temporal bone.
• Cartilage:
  • Meckel’s cartilage.
• Muscles:
  • Temporalis, masseter, medial and lateral pterygoid.
  • Mylohoid.
  • Anterior belly of diagastric.
  • Tensor palatine, tensor tympani.
• Nerve: Mandibular division of trigeminal nerve.

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Question 2. Derivative of Second Pharyngeal Arch.
Answer:

Second Pharyngeal Arch Cartilage:

• Stapes
• Styloid process
• Stylohyoid ligament.
• Lesser cornua of hyoid bone.
• Superior part of body of hyoid bone.

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Second Pharyngeal Arch Muscles:

• Muscles of facial expression.
• Buccinator, auricularis, frontalis, platysma, orbicularis oris, orbicularis oculi.
• Posterior belly of disgastric.
• Stylohyoid.
• Stapedius.
• Nerve: facial nerve.
• Synonym: Hyoid arch.