Teres minor comprises its superior border, while teres major bounds it inferiorly, long head of triceps medially, and humeral shaft laterally. The function of this space is to provide passageway for the axillary nerve and posterior circumflex humeral artery, from the anterior to posterior shoulder regions.
What is the teres minor muscle?
Teres minor is one of four muscles that comprise what’s called the Rotator Cuff. It’s narrow and elongated in shape and sometimes may be fused with infraspinatus. Its main function is to stabilize the humerus in the glenoid fossa when the shoulder moves.
What is the action of the teres major?
The main function of teres major is to produce the movements of the humerus at the glenohumeral joint; it pulls the anterior surface of the humerus medially towards the trunk (internal rotation). Furthermore, it can extend the arm from the flexed position.
What are the actions of infraspinatus and teres minor?
These muscles act to stabilize and move the glenohumeral joint. The infraspinatus and teres minor act synergistically as external rotators of the shoulder.
Why do the teres major and minor have antagonistic actions?
NOTES: The Teres minor is the “T” of SITS (Supraspinatus, Infraspinatus, Teres minor, Subscapularis), an acronym for the rotator cuff group. Teres minor and the adjacent teres major have antagonistic joint actions because they wrap around the humerus in opposite directions.
What is the action of the teres major muscle quizlet?
medially rotated position, with the hand resting on the posterior iliac crest. of abduction and flexion. as well as adduction and extension of the humerus.
What is the action of the supraspinatus?
The supraspinatus muscle performs abduction of the arm, and pulls the head of the humerus medially towards the glenoid cavity. It independently prevents the head of the humerus from slipping inferiorly.
Is the teres minor part of the rotator cuff?
The infraspinatus and teres minor attach to head of the humerus; as part of the rotator cuff they help hold the humeral head in the glenoid cavity of the scapula. They work in tandem with the posterior deltoid to externally (laterally) rotate the humerus, as well as adduction.
What is the antagonist to teres minor?
The teres minor: agonistic: anterior deltoid, latissimus dorsi, lower trapezius, pectoralis major, pectoralis minor, posterior deltoid, infraspinatus, rhomboid major, rhomboid minor, supraspinatus upper trapezius. antagonistic: middle deltoid, middle trapezius, serratus anterior, levator scapulae.
What is common between infraspinatus and teres minor?
The infraspinatus and teres minor both aid in lateral, or external, rotation of the arm at the shoulder.
What causes teres minor injury?
How Is the Teres Minor Injured? An injury to this muscle can be the result of trauma, such as a fall, direct blow to the shoulder, or rapid use of force (like pulling on a starter cable for a lawn mower).
