LAB 4 Intrinsic Muscles of Forelimb Flashcards
What is the action of the supraspinatus muscle?
= Shoulder extension and prevention of downward dislocation of the humerus.
Q: What nerve innervates the supraspinatus muscle?
= Suprascapular nerve.
Q: What is the main function of the infraspinatus muscle?
= Lateral rotation of the shoulder and stabilization of the shoulder joint.
Q: What is the innervation of the infraspinatus muscle?
= Suprascapular nerve.
Q: What are the actions of the deltoideus muscle?
Flexes the shoulder and abducts the limb.
Q: Which nerve innervates the deltoideus muscle?
= Axillary nerve.
Q: What is the action of the teres minor muscle?
= Lateral rotation of the shoulder and stabilization of the shoulder joint.
Q: What is the innervation of the teres minor muscle?
= Axillary nerve.
Q: What is the action of the teres major muscle?
= Medial rotation and extension of the shoulder.
Q: What nerve supplies the teres major muscle?
= Axillary nerve.
Q: What is the action of the subscapularis muscle?
= Medial rotation of the shoulder, and
= prevention of cranial dislocation of the humerus.
Q: What nerve innervates the subscapularis muscle?
= Subscapular nerve.
Q: What is the action of the triceps brachii muscle?
= Extension of the elbow, and the long head also extends the shoulder.
Q: What is the innervation of the triceps brachii muscle?
= Radial nerve.
Q: What are the four heads of the triceps brachii muscle?
= Long head, lateral head, accessory head, and medial head.
Q: What is the function of the anconeus muscle?
Assists in elbow extension.
Q: What nerve innervates the anconeus muscle?
Radial nerve.
What is the action of the tensor fasciae antebrachii muscle?
= Tenses the antebrachial fascia and assists in elbow extension.
Q: Which nerve supplies this muscle?
= Radial nerve.
Q: What does the coracobrachialis muscle do?
= Adducts the shoulder and helps with shoulder flexion.
Q: What is the innervation of the coracobrachialis muscle?
= Musculocutaneous nerve.
Q: What is the action of the biceps brachii muscle?
Flexes the elbow and flexes the shoulder (long head).
Q: What nerve innervates the biceps brachii muscle?
= Musculocutaneous nerve.
Q: What action does the brachialis muscle perform?
= Flexion of the elbow.
