Question 1

Which two bones form the pectoral (shoulder) girdle, providing attachment points for many trunk and neck muscles and allowing exceptional mobility for the upper limb?

Accepted Answer

Clavicle and scapula

Question 2

The only direct bony attachment of the pectoral girdle to the axial skeleton is at which joint?

Accepted Answer

Sternoclavicular joint

Question 3

Which feature of the scapula allows the upper limb to have a wide range of motion but also makes it more susceptible to dislocation?

Accepted Answer

Shallow glenoid cavity

Question 4

A patient presents with a 'winged scapula,' as shown in the image. Which muscle is most likely paralyzed, leading to this condition?

Accepted Answer

Serratus anterior

Question 5

Which of the following best explains why the pectoral girdle allows for such a high degree of mobility in the upper limb?

Accepted Answer

The scapula is only loosely attached to the thorax and the glenoid cavity is shallow

Question 6

If the clavicle is fractured, which of the following is most likely to be compromised?

Accepted Answer

Stability of the shoulder and transmission of force from the upper limb to the axial skeleton

Question 7

Which anatomical landmark on the scapula serves as the point of articulation with the head of the humerus?

Accepted Answer

Glenoid cavity

Question 8

A patient is unable to abduct their arm above the horizontal plane. Which structure of the pectoral girdle is most likely involved?

Accepted Answer

Scapula

Question 9

Which of the following statements about the scapula is correct?

Accepted Answer

It can glide over the thorax, allowing for increased mobility of the upper limb

Question 10

If the glenoid cavity were deeper, which of the following would most likely occur?

Accepted Answer

The shoulder joint would be more stable but less mobile

Question 11

Which of the following best describes the function of the clavicle in the pectoral girdle?

Accepted Answer

Acts as a strut to hold the scapula and arm laterally away from the thorax

Question 12

A trauma patient has a fracture at the acromion process. Which movement is most likely to be affected?

Accepted Answer

Overhead abduction of the arm

Question 13

Which of the following is NOT a function of the pectoral girdle?

Accepted Answer

Protecting the abdominal viscera

Question 14

Which of the following best describes the anatomical position of the scapula relative to the rib cage?

Accepted Answer

Posterior and lateral

Question 15

Which movement would be most limited if the scapula could not glide over the thorax?

Accepted Answer

Raising the arm above the head

Appendicular Skeleton: Pectoral (Shoulder) Girdle

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