SHOULDER Flashcards
this includes muscle origin, insertion, innervation and action of the muscles in the scapular region
What is the origin of the Teres Major muscle?
Inferior angle and lower part of the lateral border of the scapula
Teres Major is involved in the adduction and medial rotation of the humerus.
Where does the Teres Major insert?
Intertubercular sulcus of the humerus
This insertion allows the muscle to facilitate arm movements.
Which nerve innervates the Teres Major?
Lower subscapular nerve
This nerve plays a crucial role in the muscle’s function.
What is the primary function of the Teres Minor muscle?
Lateral rotation of the arm, stabilization of the humerus as part of the rotator cuff muscles
The Teres Minor is essential for shoulder stability.
What is the origin of the Teres Minor muscle?
Lateral border of the scapula
This location is important for its role in arm movement.
What is the insertion point for the Infraspinatus muscle?
Greater tubercle of the humerus
This insertion is critical for the muscle’s function in lateral rotation.
Which nerve innervates the Infraspinatus muscle?
Suprascapular nerve
The Suprascapular nerve is vital for shoulder function.
What is the main function of the Supraspinatus muscle?
Assistance in arm abduction, stabilization of the humerus as part of the rotator cuff muscles
The Supraspinatus is crucial for initiating arm abduction.
What is the origin of the Serratus Anterior muscle?
Lateral parts of the 1st and 8th ribs
This muscle plays a key role in scapular movement.
What is the function of the Serratus Anterior muscle?
Protraction and rotation of the scapula
Essential for shoulder movements and stability.
Which nerve innervates the Serratus Anterior muscle?
Long thoracic nerve
Damage to this nerve can lead to winged scapula.
What is the origin of the Subscapularis muscle?
Subscapular fossa
This muscle is part of the rotator cuff group.
What is the primary function of the Subscapularis muscle?
Medial rotation of the arm, stabilization of the humerus as part of the rotator cuff muscles
Critical for shoulder stability and movement.
What is the insertion point for the Levator Scapulae muscle?
Posterior surface of the medial scapular border
This insertion allows for elevation of the scapula.
Which nerve innervates the Levator Scapulae muscle?
Anterior rami of the nerve C3 and C4, dorsal scapular nerve (branch of the C5)
This innervation is important for neck and shoulder movements.
What is the function of the Rhomboid Major muscle?
Retraction and fixation of the scapula on the thoracic wall
Important for maintaining scapular position during arm movements.
What is the origin of the Rhomboid Minor muscle?
Spinous processes of T2 to T5
This muscle supports scapular retraction.
What is the primary function of the Trapezius muscle?
Elevation, depression, and retraction of the scapula
This muscle is crucial for various shoulder movements.
What are the origins of the Pectoralis Major muscle?
Anterior manubrium and body of sternum, anterior costal cartilages 1-6, medial 1/2 anterior clavicle
These origins allow for a wide range of arm movements.
What is the innervation of the Pectoralis Minor muscle?
Medial pectoral nerve
This innervation is essential for its function in scapular protraction.
What is the function of the Deltoid muscle?
Abduction and stabilization of the shoulder joint
The Deltoid is key for lifting the arm.
What is the origin of the Latissimus Dorsi muscle?
Spinous processes of T7-L5 and sacrum, iliac crest, X-XII ribs
This broad origin contributes to its powerful movements.
Fill in the blank: The Deltoid muscle inserts at the _______.
Deltoid tuberosity of the humerus
