What muscles are in the anterior thoracic wall?
Excerpt. The thoracic wall is made up of five muscles: the external intercostal muscles, internal intercostal muscles, innermost intercostal muscles, subcostalis, and transversus thoracis. These muscles are primarily responsible for changing the volume of the thoracic cavity during respiration.
What are the true muscles of the thoracic wall?
The thoracic wall also has muscles that have their primary action in the thoracic wall, and these are called the true muscles. They are the serratus posterior, levatores costarum, subcostals, transversus thoracis, and the innermost, internal, and external intercostals.
Where are the thoracic muscles?
The intercostals (external, internal and innermost), subcostals and transversus thoracic are the 5 muscles which comprise the thoracic cage and are therefore considered muscles of the thorax. Together, these muscles alter the volume of the thoracic cavity through moving the rib cage appropriately during respiration.
Where does the Subcostales muscle insert?
Origin and insertion Subcostal muscles originate from the inner surface of one rib near its posterior angle. Their fibers descend inferomedially in the same fashion as those of the innermost and internal intercostals. Each subcostal muscle inserts to the inner surface of the second or third rib below its origin.
Where is the serratus anterior muscle?
The serratus anterior (SA) is a fan-shaped muscle that originates on the superolateral surfaces of the first to eighth or ninth ribs at the lateral wall of the thorax and inserts along the superior angle, medial border, and inferior angle of the scapula.
What are posterior thoracic muscles?
Muscles of the posterior thorax, such as the levatores costarum and serratus posterior superior and inferior, may also aid in respiration. The levatores costarum originates from the transverse processes of C7 to T11 and inserts onto the rib below. It minimally aids in inspiration via rib elevation.
What are subcostalis muscles?
The Subcostales (singular: subcostalis) (Infracostales) consist of muscular and aponeurotic fasciculi, which are usually well-developed only in the lower part of the thorax; each originates from the inner surface of one rib, and is inserted into the inner surface of the second or third rib below, near its angle.
What is levatores costarum?
The levatores costarum (or levator costae) muscles are paired muscles of the posterior thorax. They number twelve on each side and attach to the transverse processes of C7 to T11 vertebrae and the ribs below, helping to elevate the ribs during respiration.
Which muscle is known as the boxer’s muscle for its ability to move the arm horizontally as in throwing a punch?
Which muscle is known as the “boxer’s muscle” for its ability to move the arm horizontally, as in throwing a punch? The serratus anterior can be used to violently pull the scapula laterally and thus pull the shoulder forward, adding strength to a horizontal punch.
What do the serratus anterior muscles do?
When the shoulder girdle is fixed, all three parts of the serratus anterior muscle work together to lift the ribs, assisting with respiration. 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.
Which includes all of the forearm muscles in the deep layer of the anterior compartment?
Deep layer of the anterior compartment The deep layer contains three muscles: Flexor pollicis longus. Flexor digitorum profundus. Pronator quadratus.
What are the deep anterior forearm muscles?
The deep anterior forearm muscles are three muscles lying at the ventral/anterior forearm. They run deep to the flexor digitorum superficialis, very closely to the radius and ulna, and for that reason they are difficult to palpate. In detail they are:
What are the muscles of the thoracic wall?
Musculature of the thoracic wall include muscles that fill and support the intercostal spaces, muscles extending between the sternum and the ribs, and those that cross several ribs between costal attachments. Transversus thoracis muscle.
What muscle turns the forearm posteriorly?
Pronator teres: Pronator teres pronates the forearm, turning the hand posteriorly. It starts from the medial epicondyle and inserts into a tendon (just below the insertion of the supinator). Pronator quadratus is a square shaped muscle and when it contracts, it pulls the lateral side of the radius towards the ulna, thus pronating the hand.
What are the muscles of the ant/ventral forearm?
muscles of the ant/ventral forearm: the photo on the left shows muscles that are deep to the ones on the right. Most of these originate from the lateral epicondyle. Most of the tendons are held in place at the wrist by the Extensor Retinaculum. These are extensors of the wrist and fingers and supinate the forearm.