Question

Regarding Sibson's fascia, which of the following is incorrect?

• A. Attached to the inner border of the 2nd rib
• B. Covers the apical part of the lung
• C. Part of the scalenus anterior muscle
• D. Vessels pass above the fascia

Hint:

The suprapleural membrane grips the first rib and C7, not the second rib.

Answer 1

The Correct Option is A

Step 1: Sibson's fascia is the suprapleural membrane, a thickening of connective tissue that roofs over the cervical pleura and the apex of each lung.
Step 2: Its correct attachments are to the inner border of the first rib and to the transverse process of the C7 vertebra. It is regarded as a flattened, fascial extension of the scalenus minimus muscle, and structures such as the subclavian vessels arch above it. So the statements about covering the lung apex, being a muscular fascial extension, and vessels lying above it are essentially correct.
Step 3: The incorrect statement is that it attaches to the inner border of the second rib. The true attachment is the first rib, not the second. Hence the false option is attachment to the second rib.