what is the origin insertion and action of the pectoralis minor

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How to release the pectoralis minor?

Ok, So How Do I Stretch the Pecs?

• Understanding that the pectoral muscles are made up of two different muscles. Once you understand how they are laid out, you will know the areas you need to target.
• Performing self-myofascial release to relieve any trigger points/knots that cause tightness.
• Once the muscles have been released, you will then need to begin stretching them out.

What is the best stretch for the pectoralis minor?

• Stand against the outer corner of a room or in a doorway. ...
• Place your right forearm against the corner of the wall with your left side open to the room.
• Gently press into your right forearm as you lean your left side into the open space of the doorway or room to feel a stretch in your right pectoral muscle.

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What does muscle origin, insertion, and action mean?

Muscle origins and insertions describe the places where a muscle attaches on bones. Conventionally, a muscle origin describes the attachment of a muscle on the more stable bone. The insertion then, is the attachment of a muscle on the more moveable bone. The action of the muscle describes what happens when the more mobile bone is brought toward ...

Is the pectoralis major anterior to the rhomboids?

latissimus dorsi and pectoralis major Accessing the medial portion of the serratus anterior by curling your fingers around the medial border of the scapula, your fingers will inherently have to work through the bellies of which two muscles? trapezius and rhomboids

What is the origin and insertion of the pectoralis minor?

Attachments of Pectoralis Minor Muscle: Origin & Insertion Origin: (proximal attachments): Anterior surfaces of the sternal ends of ribs 3-5. Insertion: (distal attachments): Coracoid process of scapula.

What is the action of pectoralis minor?

Function. The primary actions of this muscle include the stabilization, depression, abduction or protraction, internal rotation and downward rotation of the scapula.

Which is the insertion of the pectoralis minor?

Coracoid processPectoralis minor / InsertionThe coracoid process is a small hook-like structure on the lateral edge of the superior anterior portion of the scapula. Pointing laterally forward, it, together with the acromion, serves to stabilize the shoulder joint. It is palpable in the deltopectoral groove between the deltoid and pectoralis major muscles. Wikipedia

What is the origin of the pectoralis?

Pectoralis major muscleOriginClavicular part: anterior surface of medial half of clavicle Sternocostal part: anterior surface of sternum, Costal cartilages of ribs 1-6 Abdominal part: Anterior layer of rectus sheathBlood supplyPectoral branches of thoracoacromial artery, perforating branches of internal thoracic artery3 more rows

What is the insertion of the pectoralis major quizlet?

Origin: Juncition of rib 1 and its costal cartilage, insert inferior surface of middle third of clavicle, innervation: Nerve to subclavius (C5-C6), FX: Anchors and depresses clavicle.

What is the pectoralis major action?

The pectoralis major's primary functions are flexion, adduction, and internal rotation of the humerus. The pectoral major may colloquially be referred to as "pecs", "pectoral muscle", or "chest muscle", because it is the largest and most superficial muscle in the chest area.

What is the origin insertion and action of the serratus anterior?

The serratus anterior is a muscle that originates on the surface of the 1st to 8th ribs at the side of the chest and inserts along the entire anterior length of the medial border of the scapula. The serratus anterior acts to pull the scapula forward around the thorax.

What is the origin and insertion of deltoid?

The deltoid is a thick, triangular shoulder muscle. It gets its name because of its similar shape to the Greek letter 'delta' (Δ). The muscle has a wide origin spanning the clavicle, acromion and spine of scapula. It passes inferiorly surrounding the glenohumeral joint on all sides and inserts onto the humerus.

What is the origin and insertion of the triceps brachii?

The triceps brachii muscle consists of a long, medial and lateral head, that originate from their respective attachments on the humerus and scapula, and insert via a common tendon on the ulna.

What is the origin and insertion of the trapezius muscle?

Trapezius Attachments It originates on the occipital bone, the ligamentum nuchae, and the spinous processes of T01–T12. The trapezius inserts on the lateral third of the clavicle, as well as the acromion and scapular spine of the scapula.

What is the antagonist of pectoralis minor?

The antagonists of the pec minor muscle include the Trapezius (upper and lower fibers), Serratus Anterior (lower fibres), and the muscles in the posterior cuff of the shoulder.

How does pectoralis minor depress the scapula?

Function. Pectoralis minor muscle depresses the point of the shoulder, drawing the scapula superior, towards the thorax, and throwing its inferior angle posteriorly.

What is the main action of the serratus anterior?

The serratus anterior, also known as the “boxer's muscle,” is largely responsible for the protraction of the scapula, a movement that occurs when throwing a punch.

Why pectoralis major is important?

These large muscles help you move your shoulder. These muscles help pull your arm across the front of your body. Injury to the pectoralis major can cause shoulder pain and limit your ability to use your arm fully.

Where is the pectoralis minor located?

The pectoralis minor is the much smaller of the two, and it is located underneath the pectoralis major. Both of these characteristics of the pectoralis minor make it the 'little brother muscle of the chest.'. The pectoralis minor muscle originates from the front surfaces of the third, fourth, and fifth ribs.

What is the muscle under the pectoralis called?

Did you know that there is a chest muscle located under the pectoralis major, which is called the pectoralis minor? The pectoralis minor is a thin, flat muscle of the chest that's located underneath the pectoralis major. Since the pectoralis minor muscle is smaller and located underneath the pectoralis major, this muscle is thought ...

What is the large pectoralis major muscle?

The large pectoralis major muscles are the visible muscles in the chest in men. Females have them too, but the the pectoralis major is covered by breast tissue in women, so they're not usually visible. Did you know that there is a chest muscle located under the pectoralis major, which is called the pectoralis minor?

What is the purpose of raising the third, fourth, and fifth ribs during inhalation?

Elevation of the third, fourth, and fifth ribs: raising these ribs during inhalation to help expand the chest cavity and lung capacity.

Which muscle is located underneath the ribs?

Elevation of the third through fifth ribs. Pulling the ribs up which allows the chest cavity and lung capacity to expand; this assists in inhalation. Lesson Summary. There are two main muscles of the chest, the pectoralis major, and the pectoralis minor. The pectoralis minor is the much smaller of the two, and it is located underneath ...

Where is the coracoid process located?

The coracoid process is a bony, hook-shaped prominence located at the top, front border of the scapula. There are several actions that are caused by the pectoralis minor muscle. These actions include: Abduction/protraction of the scapula: pulling the scapula forward. Depression of the scapula: pulling the scapula downward.

What muscle moves the scapula?

The coracoid process is a bony, hook-shaped prominence that protrudes from the top, front border of the scapula. The main action of the pectoralis minor muscle is to move the scapula or shoulder blade.

Where is the base of the pectoralis minor?

Origin. The base of pectoralis minor is formed by fleshy slips arising from the anterior third to fifth ribs, close to the costal cartilage. Variations in the origin of the muscle is common.

What happens when the pectoralis minor is weak?

When pectoralis minor is weak, the strength of arm is diminished. Moreover, weakness of this muscle will increase respiratory difficulty in patients already experience fatigue and/or compromise of the respiratory muscles.

What is the result of an overactive pectoralis minor and underactive serratus anterior?

An overactive pectoralis minor and underactive serratus anterior leads to winging of the scapula - prominence of the medial border of the scapula with anterior tilting, together with prominence of the inferior angle and depression of the coracoid process.

Which blood vessel supplies the pectoralis minor muscle?

The blood vessel that supplies the pectoralis minor muscle is the thoracoacromial artery; a short artery that branches off from the larger axillary artery of the chest and upper extremities.

What muscle is used to move the scapula forward?

When the ribs are immobilized, this muscle brings the scapula forward, Both pectoralis muscles work with the serratus anterior muscles to create full range of movement for the scapula.

What is the deep surface of the pectoralis minor?

In females, it is covered by the breast. The deep surface of the muscle covers the pectoralis minor and serratus anterior muscles and the anterior surface of the upper six ribs.

What are the parts of the pectoralis major?

The pectoralis major has a broad origin, based on which it is divided into three parts: clavicular part, sternocostal part and abdominal part. All three parts converge laterally and insert onto the greater tubercle of humerus. The main function of this chest muscle as a whole is the adduction and internal rotation of the arm on the shoulder joint.

Why is the pectoralis major muscle important?

This action is important in activities such as climbing. When acting from the humeral attachment, the pectoralis major muscle also facilitates the act of inspiration. This is particularly important during forced breathing in physical distress.

How long does it take to read a pectoralis major?

Reading time: 5 minutes. Pectoralis major muscle (Musculus pectoralis major) The pectoralis major is a paired, superficial muscle located on the anterior surface of the thoracic cage. If you’re a gym lover, you’ll hear these muscles also being referred to as the pecs muscles. The pectoralis major has a broad origin, ...

What is the triangular depression between the pectoralis and the deltoid muscle?

The triangular depression between the pectoralis major muscle, deltoid muscle and clavicle is called i nfraclavicular fossa (Mohrenheim’s fossa) which serve s as an important landmark in the surgical procedures on the subclavian artery.

Which muscle pulls the humerus back to the anatomical position?

The sternocostal portion of the muscle can produce the antagonistic movement and extend the humerus back to the anatomical position. Acting together with the of latissimus dorsi muscle, the pectoralis major muscle pulls the trunk forwards or upwards when its humeral attachment is fixed.

Which muscle acts as an adductor and internal rotator of the humerus at the shoulder joint?

When the arm is the anatomical position, the pectoralis major acts as a strong adductor and internal rotator of the humerus at the shoulder joint. Acting independently, the clavicular portion of the muscle flexes the humerus up to 90 degrees in a horizontal plane. The sternocostal portion of the muscle can produce the antagonistic movement ...

Where does the pectoralis major originate?

One of the heads is called the clavicular head, which originates on the inside part of the clavicle (collarbone). The other head is called the sternal head, and it originates from three different areas, which include: Outside border of the sternum (breast plate)

Where are the insertion points of the pectoralis major muscle located?

These two points of insertion are both located on the humerus, which is the long bone of the upper arm.

What is the clavicular and sternal head of the pectoralis major?

Both the clavicular and sternal heads of the pectoralis major insert on the same two locations, which are the bicipital groove of the humerus and the deltoid tuberosity of the humerus. The humerus is the long bone of the upper arm. The pectoralis major produces several different actions of the humerus, or upper arm.

What is the pectoralis major?

The pectoralis major is a thick, triangular-shaped muscle located on both sides of the chest. This muscle makes up most of the chest muscles in both males and females, although it's less visible in females because it's covered up by breast tissues. The pectoralis major muscle lies on top of the pectoralis minor muscle, ...

What muscle is involved in the push up?

Action. The main action of the pectoralis major muscle is to move the humerus, or upper arm. These movements include: Flexion: moving the upper arm straight up in front, such as when your arms are straight out in front of you at the start of the push-up position or when you're holding something straight out in front of you.

Where is the insertion of the biceps brachii tendon?

One of these points of insertion is the bicipital groove, which is a groove at the top of the humerus where the biceps brachii tendon is found. The other point of insertion is the deltoid tuberosity, which is a triangular area located in the middle of the humerus.

Which muscle has two heads?

Costal cartilages of the top six ribs (cartilage extensions at the front of each rib) Aponeurosis of the external oblique muscle (fibrous tissue of the external oblique) The pectoralis major has two different heads, which include the clavicular head and the sternal head.