QuestionSBA
QuestionChoice
The subscapularis originates in the subscapular fossa and is the only rotator cuff muscle to insert onto the lesser tubercle of the humerus. The other rotator cuff muscles insert into the greater tubercle of the humerus.
10004521
a
The subscapularis is the only rotator cuff muscle to insert onto the lesser tubercle of the humerus
QuestionChoice
The supraspinatus acts to initiate arm abduction, therefore injury to it results in patients having difficulty abducting their arm, not laterally or medially rotating it.
10004523
c
Injury to the supraspinatus can cause a laterally rotated arm
QuestionChoice
This is the action of the teres major muscle, which is not part of the rotator cuff. The teres minor acts to laterally rotate the arm.
10004522
b
The teres minor acts to medially rotate and extend the arm
QuestionChoice
The innervation is by the suprascapular, axillary and sub-scapular nerves, which originate from C5-7 nerve roots.
10004525
e
The innervation of the rotator cuff muscles originates from C6-C8 spinal nerve roots
QuestionChoice
The infraspinatus is innervated by the suprascapular nerve. The inferior subscapular nerve innervates the teres major and subscapularis.
10004524
d
The infraspinatus is innervated by the inferior subscapular nerve
Concept
Chapter
2693
4300
Shoulder dislocation
Topic
145
Orthopaedics
13451
Which of the following statements, regarding the rotator cuff, is correct?
a