The primary actions of this muscle include the stabilization, depression, abduction or protraction, internal rotation and downward rotation of the scapula. It elevates the ribs for deep inspiration when the pectoral girdle is fixed or elevated.

What is the main action of the pectoralis?

The pectoralis major extends across the upper part of the chest and is attached to a ridge at the rear of the humerus (the bone of the upper arm). Its major actions are adduction, or depression, of the arm (in opposition to the action of the deltoideus muscle) and rotation of the arm forward about the axis of the body.

What is the pectoralis minor muscle?

The pectoralis minor muscle is a small, flat, triangular-shaped muscle located in your chest. The muscle, also know known as pec minor, is located beneath its counterpart pectoralis major and serves to move both your ribs and shoulder blade.

What is the origin insertion and action of the pectoralis minor?

OriginAnterior surface, costal cartilages of ribs 3-5InsertionMedial border and coracoid process of scapulaInnervationMedial and lateral pectoral nerves (C5-T1)Blood supplyThoracoacromial a. (pectoral and deltoid branches), superior thoracic a., lateral thoracic a.

On which process does the pectoralis minor insert?

The pectoralis minor muscle originates from the front surfaces of the third, fourth, and fifth ribs on each side of the rib cage. From these three locations, the muscle extends up the chest and inserts on the coracoid process of the scapula (shoulder blade).

What is the action of the pectoralis major muscle quizlet?

Origin: Clavicular head: Anterior surface of the medial half of the clavicle, Sternocostal head: Anterior surface of sternum superior 6 costals, and aponeurosis of external oblique, INsert: Lateral lip of intertubercular groove of humerus, Innervation: Lateral and medial pectoral nerves (C5-T1), Fx: Adducts and …

Where is pectoralis major and minor?

The pectoralis minor lies underneath its larger counterpart muscle, pectoralis major. Both muscles form part of the anterior wall of the axilla region. Attachments: Originates from the 3rd-5th ribs and inserts into the coracoid process of the scapula.

What is the latissimus dorsi action?

Latissimus dorsi works collaboratively with the teres major and pectoralis major to perform actions of the upper extremity. Together, these muscles will work to adduct, medially rotate and extend the arm at the glenohumeral joint.

What is the pectoralis minor medial to?

Pectoralis minorNerveMedial pectoral nerve (C8)ActionsStabilizes the scapula by drawing it inferiorly and anteriorly against the thoracic wall, raises ribs in inspirationIdentifiersLatinMusculus pectoralis minor

What is the action of the serratus anterior?

Action. The main actions are protraction and upward rotation of the scapulothoracic joint, moving the scapula forward across the thoracic wall. It also keeps the medial boarder and inferior angle of the scapula close to the thoracic wall.

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Which correctly describes the location of the pectoralis minor?

Pectoralis minor is a thin triangular muscle lying deep to the pectoralis major. It originates from the 3rd, 4th and 5th ribs near the costal cartilages. Its fibres ascend laterally and converge in a flat tendon that attaches to the medial border and upper surface of the coracoid process of the scapula.

Is the pectoralis minor deep or superficial?

The pectoralis minor muscle is a small triangular shaped muscle that lies deep to pectoralis major muscle and passes as three muscular slips from the thoracic wall (ribs III to V) to the coracoid process of the scapula. Pectoralis minor draws the scapula forward and downward, and raises the ribs in forced inspiration.

How do you palpate pectoralis minor?

For a palpatory clinical visit, the pectoralis minor muscle can be palpated by placing a finger in the axilla and pushing obliquely towards the coracoid process of the scapula. If it is sore, the muscle is in spasm.

Why pectoralis minor is key muscle?

Function. The primary actions of this muscle include the stabilization, depression, abduction or protraction, internal rotation and downward rotation of the scapula. It elevates the ribs for deep inspiration when the pectoral girdle is fixed or elevated.

What is the pectoralis minor named for?

The name of the pectoralis minor muscle describes the general location of this muscle. Pectoralis comes from the Latin word “pectus” meaning breast. Minor comes from Greek and means “the lesser”. This is the smaller of the two pectoralis muscles.

Where does the pectoralis minor insert quizlet?

Pectoralis minor originates from the 3rd-5th ribs, and inserts into the coracoid process of the scapula. Pectoralis Minor Function: Stabilizes the scapula by drawing it anteroinferiorly against the thoracic wall.

Which of the following is the insertion of the pectoralis minor quizlet?

The insertion of the pectoralis minor is the coranoid process of the scapula. The origin of the subclavius is the superior aspect of the first rib at its junction with its costal cartilage.

What is the action of the latissimus dorsi muscle quizlet?

Palpation: Latissimus dorsi and theres major both compromise the posterior portion of the axilla and can be palpated together at the posterior axillary fold. Action: Lateral Rotation, aDDuction and Extension of the arm.

What is the action of the deltoid muscles?

Deltoid muscle functions include: Arm abduction, which means raising your arm out to the side of your body. Compensation for lost arm strength if you have an injury, such as a rotator cuff tear. Flexion (moving your arm forward, toward an overhead position) and extension (moving your arm backward, behind your body).

What is the innervation to pectoralis major and minor?

The pectoralis major receives dual motor innervation by the medial pectoral nerve and the lateral pectoral nerve, also known as the lateral anterior thoracic nerve. The sternal head receives innervation from the C7, C8 and T1 nerve roots, via the lower trunk of the brachial plexus and the medial pectoral nerve.

What is the action and innervation of the latissimus dorsi?

Functionally, the latissimus dorsi muscle belongs to the muscles of the scapular motion. … This muscle is able to pull the inferior angle of the scapula in various directions, producing movements on the shoulder joint; internal rotation, adduction and extension of the arm.

What joint is responsible for abduction movement?

The major movements at the glenohumeral joint are: Abduction: upward lateral movement of humerus out to the side, away from the body, in the plane of the scapula.

What is the supraspinatus action?

Function. The supraspinatus muscle performs abduction of the arm, and pulls the head of the humerus medially towards the glenoid cavity. … Beyond 15 degrees the deltoid muscle becomes increasingly more effective at abducting the arm and becomes the main propagator of this action.

What joint does the teres minor act on?

The teres minor is deep to the deltoid muscle. As a rotator cuff muscle, the teres minor stabilizes the ball-and-socket glenohumeral joint by helping hold the humeral head (ball) into the shallow glenoid cavity of the scapula (socket). The teres minor also laterally, or externally, rotate the arm at the shoulder joint.

What is the action of the trapezius muscle?

The trapezius muscle is a postural and active movement muscle, used to tilt and turn the head and neck, shrug, steady the shoulders, and twist the arms. The trapezius elevates, depresses, rotates, and retracts the scapula, or shoulder blade.

Which of the following correctly describe s the location of the rhomboids both minor and major?

Correctly describe the location of the rhomboids, both minor and major? They are posterior thoracic muscles. They are inferior to the levator scapulae.

Which of the following is an action of the Brachioradialis?

Function. The brachioradialis flexes the forearm at the elbow. Depending on the position of the hand during the flexion, the brachioradialis can tend to move the hand to neutral.

What Innervates pectoralis major?

The lateral pectoral nerve branches from the lateral cord superficial to the first part of the axillary artery and vein, sends a branch to the medial pectoral nerve, and continues on to innervate pectoralis major.

What is pectoralis minor tenotomy?

Pectoralis minor tenotomy (PMT) is a potential surgical option for selected patients with neurogenic thoracic outlet syndrome (NTOS. The purpose of this study was to evaluate the effectiveness of isolated PMT as compared with supraclavicular decompression (SCD: scalenectomy, neurolysis, and first rib resection) first.

How do you treat a minor chest strain?

In isolated pectoralis minor tendon tears, however, a conservative treatment approach is typically recommended. Recommend rest, ice, and anti-inflammatory medication for the first two to four weeks following the injury. The athlete may use an arm sling to increase comfort, but complete immobilization isn’t necessary.