Question

Mrs. Lennox reports difficulty reaching the back of her head, lacking upward rotation. The patient is lacking:

a) Weakness in the supraspinatus muscle
b) Weakness in the infraspinatus muscle
c) Weakness in the serratus anterior muscle
d) Weakness in the pectoralis major muscle

Answer 1

The patient's difficulty reaching the back of their head and lacking upward rotation is most likely due to weakness in the serratus anterior muscle.

Step-by-step explanation:

The patient is lacking upward rotation and is having difficulty reaching the back of their head. Based on the given information, the weakness is most likely due to a weakness in the serratus anterior muscle. The serratus anterior muscle plays a key role in upward rotation of the scapula and is responsible for allowing the arm to reach positions higher than the shoulder.