Which is not true of mandible –
**Core Concept**
The mandible is the lower jawbone, a long, flat bone in the skull that forms the lower jaw and contains the lower teeth. It plays a crucial role in mastication (chewing), facial expression, and speech. The mandible is a complex structure comprising a body, two rami, and a condyle.
**Why the Correct Answer is Right**
The correct statement about the mandible is that it is a long, flat bone in the skull. This is evident from its anatomical structure, which allows for the wide range of movements necessary for eating, speaking, and other oral functions. The mandible's shape and structure enable it to articulate with the temporal bone at the temporomandibular joint (TMJ), allowing for the complex movements of the lower jaw.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the mandible is indeed a long, flat bone in the skull. It does not have a cylindrical shape, which is more characteristic of bones like the humerus.
**Option B:** This option is incorrect because while the mandible does indeed articulate with the temporal bone at the TMJ, its primary function is not to stabilize the skull. That function is primarily carried out by the bones of the cranial base.
**Option C:** This option is incorrect because the mandible does indeed contain the lower teeth, which are embedded in its alveolar process. The alveolar process is a bony ridge that contains the tooth sockets.
**Clinical Pearl / High-Yield Fact**
The mandible's unique shape and structure make it susceptible to a variety of pathologies, including fractures, osteomas, and cysts. It's essential for clinicians to be aware of these potential issues when evaluating patients with mandibular complaints.
**Correct Answer:** D