23. Which label in the following image shows the only bone that is movable in the skull?
Answer: C
The mandible is the only movable bone in the skull.
The mandible is the only bone in the skull that is capable of movement, allowing for essential functions such as chewing and speaking.
A) Ethmoid bone
The ethmoid bone is a complex bone located between the nasal cavity and the orbits. It is a part of the skull but is immovable, contributing to the structure of the nasal cavity and the eye sockets without any capacity for movement.
B) Vomer bone
The vomer bone is a single bone that forms part of the nasal septum. Like the ethmoid bone, it is a fixed bone within the skull and does not allow for any articulated movement.
C) Mandible
The mandible is the lower jawbone and is unique in the skull for being movable. It articulates with the temporal bone at the temporomandibular joint, enabling a range of motions including opening and closing the mouth.
D) Malleus
The malleus, also known as the hammer, is one of the three auditory ossicles located in the middle ear. While it is a bone associated with the skull, it does not contribute to the movement of the skull itself and is not classified as a movable bone.
Conclusion
The mandible is definitively the only movable bone in the skull, facilitating essential functions such as mastication and articulation. The ethmoid bone, vomer bone, and malleus are all fixed structures that do not exhibit movement, highlighting the unique role of the mandible in the skeletal system of the head.