Q. 33 - Biology

Question

What movement(s) occur(s) at the scapulae when you shrug your shoulders? 

Step-by-Step Solution

Answer

• Elevation is the upward motion of a bone, as when the shoulders are shrugged and the scapulae are raised. 
• When the shoulders are shrugged and the scapulae are brought back to their normal position from an elevated posture, there occurs a downward movement of the bone known as depression.

Step 1 : Introduction

The synergy between scapula and shoulder joint muscles improves upper extremity movement. To raise our hand out to the side as far as possible laterally, the serratus anterior and trapezius (middle and lower fibres) muscles rotate the scapula upwards while the supraspinatus and deltoid initiate glenohumeral abduction. 

Step : 2 Scapulae

• The huge triangular-shaped bone known as the scapula, or shoulder blade, is located in the upper back. 
• An intricate network of muscles surrounds and supports the bone, which helps you move your arm. 
• The bone between your shoulder and your spine at the rear of your shoulder is called the scapula, often known as the shoulder blade. 

Step : 3 Shoulder blade in human

• The upper thoracic area, on the dorsal surface of the rib cage, contains the flat, triangular-shaped scapula. 
• The back of the shoulder girdle is formed by the scapula.
• It is situated on the posterolateral side of the thoracic cage in humans.