Which of the Following Is Not Common to All Vertebrates

question 49

Multiple Choice

Which of the following is not common to all vertebrates?

• A) a forebrain
• B) a hindbrain
• C) a convoluted cerebrum
• D) a dorsal tubular spinal cord
• E) a midbrain

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Definitions:

Orbicularis Oris

A complex of muscles in the lips that encircles the mouth, controlling movements such as closing and puckering.

Buccinator

A muscle of the cheek that compresses the cheek against the teeth and aids in chewing.

Orbicularis Oculi

A circular muscle around the orbit of the eye that allows the eyes to close, blink, and squint.

Masseter

The masseter muscle is a facial muscle that plays a key role in mastication (chewing) by elevating the mandible (lower jaw).