Is the scapula flat or irregular?

The scapula is a triangular flat bone attached to the back and outside of the chest, between the second and seventh ribs. It can be divided into two sides, three sides and three angles. The ventral or costal surface is opposite to the thorax, which is a large shallow fossa called subscapular fossa, and the transverse ridge on the dorsal surface is called scapular ridge. The superficial fossa above and below the supraspinatus muscle are called supraspinatus muscle fossa and infraspinatus fossa respectively. A flat projection extending outward from the scapula, called acromion, meets the lateral end of the clavicle. When the upper limbs droop, the vertical line passing through the lower corner of the scapula is the chest marker line.

Vertical line marks include: anterior midline, clavicle midline, axillary anterior line, axillary midline, axillary posterior line, scapular line, posterior midline, sternum line and parasternal line.

1. The anterior midline, also called the sternal midline, is a vertical line passing through the middle of the sternum.

2. The midline of clavicle is a vertical line passing through the midpoint of the connecting line between acromion end and sternum end of clavicle.

3. The anterior axillary line goes down through the anterior axillary fold along the vertical line of the anterior chest wall.

4. The vertical line from the top of the armpit down to the midpoint between the armpit front line and the armpit front line.

5. The posterior axillary line passes through the posterior axillary fold and is a vertical line downward along the posterior chest wall.

6. When the arm droops naturally, the vertical line parallel to the posterior midline passes through the lower corner of the acromion.

7. The posterior midline, also known as the midline of the spine, is a vertical line that passes through the spinous process of the vertebra or descends along the midline.

8. The sternum line is parallel to the anterior midline along the side of the widest part of the sternum.

9. The parasternal line is a vertical line passing through the midpoint of the connecting line between the sternal line and the clavicle midline.

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