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What are the main muscles of the shoulder?
The shoulder has several important muscles:
The deltoid is the main shoulder muscle. It has two heads ✗ Wrong: "two heads" ✓ Correct: The deltoid has THREE PARTS (anterior, middle, posterior) that allow arm movement in multiple directions.
The rotator cuff consists of four muscles. The supraspinatus is the largest ✗ Wrong: "supraspinatus is the largest" ✓ Correct: The SUBSCAPULARIS is the largest rotator cuff muscle of these and is most commonly injured.
The trapezius helps with shoulder blade movement and originates from the cervical vertebrae ✗ Wrong: "originates from the cervical vertebrae" ✓ Correct: It originates from the occipital bone AND cervical + thoracic vertebrae (C1-T12)
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The femoral triangle is bounded by the inguinal ligament superiorly, the sartorius laterally, and the adductor magnus medially. Contents include the femoral nerve, artery, vein, and lymphatics (NAVL from lateral to medial).
Medial border is adductor longus , not magnus
Boundaries: Inguinal ligament (superior), Sartorius (lateral), Adductor longus (medial) Contents: Femoral nerve, artery, vein, canal, lymphatics (NAVEL)
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