The Axial Skeleton Review

Identify the bone highlighted in green.

• Mandible

• Maxillae

• Zygomatic

• Lacrimal

Answer explanation

The bone highlighted in green is the maxillae, which forms the upper jaw and holds the upper teeth. It is distinct from the mandible (lower jaw), zygomatic (cheekbone), and lacrimal (part of the eye socket).

C2 acts as the pivot point for C1.

• Atlas

• Axis

Answer explanation

C2 refers to the second cervical vertebra, known as the axis, which acts as the pivot point for C1 (the atlas). This allows for the rotation of the head, making 'Axis' the correct answer.

Identify the green-highlighted bone.

• Nasal

• Lacrimal

• Ethmoid

• Vomer

Answer explanation

The green-highlighted bone is the Nasal bone, which forms the bridge of the nose. It is distinct from the Lacrimal, Ethmoid, and Vomer bones, which serve different functions in the skull.

forms part of the bridge of nose

• temporal bones

• parietal bones

• occipital bone

• nasal bones

Answer explanation

The nasal bones are the two small bones that form the bridge of the nose. They are specifically located at the center of the face, making them the correct choice for this question, unlike the other bones listed.

Largest vertebral region that articulates with the pelvis

• Sacrum

• Coccygeal

• C1

• L5

Answer explanation

The sacrum is the largest vertebral region that articulates with the pelvis, forming the back part of the pelvic cavity. It connects the spine to the pelvis, making it crucial for weight distribution and stability.

C1 articulates with the head.

• Axis

• Atlas

Answer explanation

C1, or the first cervical vertebra, is known as the Atlas. It supports the head and allows for nodding movements. The Axis is C2, which allows for rotation of the head. Therefore, the correct answer is Atlas.

Found on the midline in the anterior portion of the cranial floor.

• sphenoid

• occipital bone

• ethmoid

• temporal bones

Answer explanation

The ethmoid bone is located on the midline in the anterior portion of the cranial floor, making it the correct answer. The sphenoid and occipital bones are positioned differently, while the temporal bones are lateral.

Ribs that attach directly to the sternum?

• True ribs

• False ribs

• Floating ribs

Answer explanation

True ribs are the first seven pairs of ribs that attach directly to the sternum via costal cartilage. In contrast, false ribs do not attach directly, and floating ribs are not attached to the sternum at all.

Connects the two parietal bones to the occipital bone.

• Lambdoid suture

• Orbits

• Sutures

• Ethmoid

Answer explanation

The lambdoid suture connects the two parietal bones to the occipital bone at the back of the skull, making it the correct answer. The other options do not describe this specific connection.

Identify the green-highlighted bone.

• Parietal

• Occipital

• Frontal

• Temporal

Answer explanation

The green-highlighted bone is the occipital bone, located at the back of the skull. It is distinct from the parietal, frontal, and temporal bones, which are located on the sides and front of the skull.