Which of the following arises from infra glenoid tubercle?
**Core Concept**
The infra glenoid tubercle is a bony landmark located on the scapula, and it serves as an attachment point for various muscles and ligaments. The muscles and ligaments that arise from this region play a crucial role in shoulder joint stability and movement.
**Why the Correct Answer is Right**
The supraspinatus tendon and the teres minor muscle both originate from the infra glenoid tubercle. The supraspinatus tendon is a fibrous structure that helps to stabilize the shoulder joint, while the teres minor muscle is involved in adduction and rotation of the humerus. The infraspinatus tendon, on the other hand, originates from the infraspinous fossa, which is located above the infra glenoid tubercle. The teres major muscle arises from the lateral border of the scapula, not the infra glenoid tubercle.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the infraspinatus tendon originates from the infraspinous fossa, not the infra glenoid tubercle.
**Option B:** This option is incorrect because the teres major muscle arises from the lateral border of the scapula, not the infra glenoid tubercle.
**Option D:** This option is incorrect because the subscapularis muscle arises from the subscapular fossa, not the infra glenoid tubercle.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the infra glenoid tubercle serves as a key attachment point for the rotator cuff muscles, which play a vital role in shoulder joint stability and movement. Understanding the anatomy of the scapula and its associated muscles is crucial for diagnosing and managing shoulder injuries and disorders.
**Correct Answer: C. Teres minor muscle**