Internal Intercostals Expiratory — FRCA Primary MCQ

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ModerateAnatomyInternal Intercostals ExpiratoryFRCA Primary

The internal intercostal muscles are innervated by the intercostal nerves and function primarily as:

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Correct answer: E — Muscles of expiration (depressing the ribs)

The internal intercostals (except the interchondral portion) are expiratory muscles that depress the ribs. The external intercostals are inspiratory muscles that elevate the ribs. The interchondral (parasternal) portion of the internal intercostals is inspiratory. The intercostal nerves (ventral rami of T1-T11) supply both sets.

Reference: RCoA 2021 Primary FRCA Curriculum