**Core Concept**
Pneumatic bones are characterized by the presence of air-filled cavities or sinuses within their spongy tissue. These bones are typically found in the skull and facial regions, where they provide light weight and structural support while also contributing to the overall shape and appearance of the face.

**Why the Correct Answer is Right**
Pneumatic bones contain a network of thin-walled air-filled cavities, which are lined by mucous membranes and are connected to the nasal cavity through narrow passageways. These air-filled spaces are formed during embryonic development, when the bone tissue fails to fully ossify in certain areas. The presence of pneumatic bones is an important feature of the skull and facial anatomy, and can be used to distinguish between different species and individuals.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the sphenoid bone is a pneumatic bone, characterized by the presence of the sphenoidal sinus within its body.
**Option B:** This option is incorrect because the maxillary bone is a pneumatic bone, containing the maxillary sinus within its body.
**Option C:** This option is incorrect because the zygomatic bone is not typically considered a pneumatic bone, although it does contain a small air cell in some individuals.

**Clinical Pearl / High-Yield Fact**
It's worth noting that pneumatic bones can be affected by various pathological conditions, including sinusitis and osteomyelitis, which can lead to pain, swelling, and other symptoms in the affected area.

**Correct Answer: C. Zygomatic bone is not typically considered a pneumatic bone.**