Which bony feature is visible in the midsagittal view of the skull and forms the superior part of the nasal septum?

• A. Perpendicular plate of the ethmoid bone
• B. Mastoid process
• C. Coronoid process of the mandible
• D. Zygomatic arch

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the anatomical location described in the question. The midsagittal view refers to a vertical plane that divides the body or skull into equal left and right halves. This view allows us to observe structures along the midline of the skull.
2. Step 2: Identify the nasal septum. The nasal septum is the structure that divides the nasal cavity into left and right halves. It is composed of both bony and cartilaginous parts, with the superior portion being formed by a specific bone.
3. Step 3: Recall the ethmoid bone's anatomy. The ethmoid bone is a complex cranial bone located between the eyes and forms part of the nasal cavity. One of its features, the perpendicular plate, extends downward and contributes to the superior part of the nasal septum.
4. Step 4: Eliminate incorrect options. The mastoid process is part of the temporal bone and is located behind the ear, not visible in the midsagittal view. The coronoid process of the mandible is part of the jawbone and is not related to the nasal septum. The zygomatic arch is part of the cheekbone and is lateral, not midline.
5. Step 5: Conclude that the correct answer is the perpendicular plate of the ethmoid bone, as it is the bony feature visible in the midsagittal view and forms the superior part of the nasal septum.