Exam 3: 3. Musculoskeletal 2- upper Limbs

What bones make up the pectoral girdle?

The clavicle and scapula.

What is the function of the brachial plexus?

It provides motor and sensory innervation to the upper limb.

What are the roots of the brachial plexus?

C5 to T1.

What actions do the superior fibers of the trapezius perform?

Elevate the scapula.

What is the action of the serratus anterior muscle?

Depress and abduct the scapula.

What is the primary action of the pectoralis major muscle?

Flex, adduct, and medially rotate the arm.

Which nerve innervates the deltoid muscle?

Axillary nerve.

What are the actions of the latissimus dorsi muscle?

Extend, adduct, and medially rotate the arm.

What is the role of the rotator cuff muscles?

Stabilize the shoulder joint and assist in arm movements.

Which muscles are included in the rotator cuff?

Infraspinatus, supraspinatus, subscapularis, and teres minor.

What is the action of the biceps brachii?

Flexes and supinates the forearm; flexes the arm.

What is the action of the teres major muscle?

Extend, adduct, and medially rotate the arm.

What happens to the scapula during protraction?

It moves laterally away from the spine (abduction).

What is the most common type of dislocation in the glenohumeral joint?

Anterior dislocation.

What is the action of the triceps brachii?

Extends the elbow and extends/adducts the shoulder.

What is the function of the subclavius muscle?

Depress the clavicle.

What nerve innervates the pectoralis major?

Pectoral nerves.

What is the action of the rhomboid muscles?

Elevate and adduct the scapula.

What is the primary action of the coracobrachialis?

Flexes and adducts the arm.

What is the significance of the axillary nerve?

It innervates the deltoid and teres minor muscles.