Which muscle is located posterior to the breast tissue and deep fascial plane?

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Multiple Choice

Which muscle is located posterior to the breast tissue and deep fascial plane?

Breast tissue sits on the anterior chest wall, over the pectoral muscles, with a potential retromammary space between the gland and the underlying muscle. The muscle immediately behind the breast and its deep fascia is the pectoralis major, whose fascia forms the posterior boundary of the gland. The other muscles aren’t the structure directly behind the breast: latissimus dorsi is farther back and more inferior, serratus anterior runs along the lateral chest wall beneath the armpit region, and deltoid sits over the shoulder and upper arm.

Breast tissue sits on the anterior chest wall, over the pectoral muscles, with a potential retromammary space between the gland and the underlying muscle. The muscle immediately behind the breast and its deep fascia is the pectoralis major, whose fascia forms the posterior boundary of the gland. The other muscles aren’t the structure directly behind the breast: latissimus dorsi is farther back and more inferior, serratus anterior runs along the lateral chest wall beneath the armpit region, and deltoid sits over the shoulder and upper arm.

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