What is a sternalis muscle?
The sternalis muscle is an anatomical variant of the anterior thoracic region musculature well documented and familiar to anatomists but quite unknown among clinicians and radiologists [1]. It lies superficially and perpendicular to the pectoralis major muscle and parallel to the sternum.
What are the thorax muscles?
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.
Is there a muscle on the sternum?
The transversus thoracis muscle attaches to the body of the sternum and xiphoid process. Pectoralis major is another major muscle attached to the body of the sternum.
What muscle listed has a Thoracis section?
transversus thoracis
| Muscles of the Thoracic Region – Listed Alphabetically | ||
|---|---|---|
| Muscle | Origin | Action |
| levatores costarum | transverse processes C7-T11 | elevates the rib |
| subcostalis | angle of ribs | compresses the intercostal spaces |
| transversus thoracis | posterior surface of the sternum | compresses the thorax for forced expiration |
What is the function of the thorax?
It provides a base for the muscle attachment of the upper extremities, the head and neck, the vertebral column, and the pelvis. The thorax also provides protection for the heart, lungs, and viscera.
What arteries supply muscles of the thorax?
These arteries are the brachiocephalic trunk, left common carotid, and left subclavian arteries. As the aorta descends posterior to the heart in the left paravertebral gutter, the 3rd to 11th posterior intercostal arteries split off and supply the thoracic wall.
What is the function of the body of the sternum?
Your sternum, along with your ribs, works to protect the organs of your torso, such as your heart, lungs, and chest blood vessels. Support. Your sternum also provides a connection point for other parts of your skeletal system, including your collarbone and most of your ribs.
What organ is behind the sternum?
The thymus is a small organ located just behind the breast bone (sternum) in the front part of the chest.
What does the transversus thoracis muscle do?
Action. The transversus thoracis muscle is an accessory muscle of respiration. It depresses the ribs which supports expiration.
What thoracic level is the bra strap?
T7 (7th Thoracic Vertebra)
What is the function of the sternalis muscle?
The function of sternalis muscle is still unknown. It may participate in the shoulder joint movement or have an accessory role in the lower chest wall elevation [ 6 ].
Where is the sternalis located in the body?
The sternalis is a muscle that runs along the anterior aspect of the body of the sternum.
Is there a sternalis muscle in the anterior chest wall?
Over the recent years, an increased alertness for thorough knowledge of anatomical variants with clinical significance has been recorded in order to minimize the risks of surgical complications. We report a rare case of bilateral strap-like sternalis muscle of the anterior chest wall in a female cadaver.
Is the sternalis part of the pectoralis major?
The sternalis muscle may be a variation of the pectoralis major or of the rectus abdominis . The sternalis is a muscle that runs along the anterior aspect of the body of the sternum.