Muscles Week 8 Flashcards
What is the origin of the Teres Minor muscle?
Superior lateral border of scapula
The Teres Minor is one of the rotator cuff muscles.
Where does the Teres Minor insert?
Greater tubercle of humerus
This insertion allows the muscle to affect shoulder movement.
What action does the Teres Minor perform?
Lateral rotation of shoulder
It also stabilizes the glenohumeral joint.
Which nerve innervates the Teres Minor?
Axillary nerve
The axillary nerve is crucial for shoulder function.
What is the origin of the Subscapularis muscle?
Subscapular fossa of scapula
The Subscapularis is the largest rotator cuff muscle.
Where does the Subscapularis insert?
Lesser tubercle of humerus
This insertion point is key for shoulder internal rotation.
What action does the Subscapularis perform?
Medial rotation of shoulder
It also stabilizes the glenohumeral joint.
Which nerves innervate the Subscapularis?
Upper and lower subscapular nerves
These nerves play a significant role in shoulder mobility.
What is the origin of the supraspinatus?
Supraspinous fossa of scapula
What is the insertion of the supraspinatus?
Greater tubercle of humerus
What is the action of the supraspinatus?
Abduction of shoulder
Stabilizes glenohumeral joint
What is the innervation of the supraspinatus?
Suprascapular nerve
What is the origin of the infraspinatus?
Infraspinous fossa and inferior portion of spine of scapula
What is the insertion of the infraspinatus?
Greater tubercle of humerus
What is the action of the infraspinatus?
Lateral rotation of shoulder
Stabilizes glenohumeral joint
What is the innervation of the infraspinatus?
Suprascapular nerve
What is the origin of the deltoid muscle?
Lateral 1/3 of clavicle, acromion, and spine of scapula
Where does the deltoid muscle insert?
Deltoid tuberosity of humerus
What is the primary action of the middle fibers of the deltoid?
Abduction of shoulder
What actions do the anterior fibers of the deltoid perform?
Flexion and horizontal adduction
What actions do the posterior fibers of the deltoid perform?
Extension and horizontal abduction
What is the innervation of the deltoid muscle?
Axillary nerve
What is the origin of the Levator Scapulae?
TPs of C1-C4
Where does the Levator Scapulae insert?
Medial border of scapula (superior part)
What is the action of the Levator Scapulae?
Elevation of scapula, extension and lateral flexion of neck
What is the innervation of the Levator Scapulae?
Dorsal scapular nerve
