What is the function of the sternalis muscle?
There is no apparent physiological function of the sternalis muscle. However, there are many theories for a function. It may function as a proprioceptive sensor for thoracic wall movements. It may also take part in the movement of the shoulder joint or have an additional role in elevation of the chest wall.
What is rectus sternalis muscle?
Rectus Sternalis is one of the important muscles of anterior chest wall musculature. The location of muscle and direction of fibres suggest that this muscle may help in elevating the lower chest wall. Occurrence of Rectus Sternalis is rare but it is not the rarest and it has racial and regional variations.
How many people have a sternalis muscle?
Discussion. The unilateral sternalis muscle has been reported to be present in 4.5% of subjects, while the bilateral manifestation is found in less than 1.7% [6]. There are many theories to explain the embryological origin of sternalis muscle.
What are pectoral muscles?
The pectoral muscles are the group of skeletal muscles that connect the upper extremities to the anterior and lateral thoracic walls. Juxtaposed with the regional fascia, these muscles are responsible for moving the upper extremities in a wide range of motion.
Is Poland syndrome genetic?
Most cases of Poland syndrome are sporadic, which means they are not inherited and occur in people with no history of the disorder in their families. Rarely, this condition is passed through generations in families.
Do females have pectoral muscles?
Underneath the breasts there is fibrous tissue and muscle. The pectoral muscle passes underneath the breast and connects the chest and the arm. Lying further below the pectoral muscle are the ribs which are connected by intercostal muscles, which raise and lower the rib cage when breathing in and out.
Why is pyramidalis muscle important?
Pyramidalis is classified as a vestigial muscle which is frequently present. It is muscle of the anterior abdominal wall. It is thought to tense the linea alba. It has been used as a surgical landmark, source of muscle stem cells and in various surgical procedures.
How many people have pyramidalis muscle?
The pyramidalis muscle is present in 80% of human population. It may be absent on one or both sides; the lower end of the rectus then becomes proportionately increased in size.
Does Poland syndrome affect the brain?
All these symptoms occur on one side of the body (unilateral). Also, it is important to note that Poland anomaly does not typically affect intelligence.
Is Poland syndrome rare?
Poland Syndrome is a rare condition that is evident at birth (congenital). Associated features may be extremely variable from case to case.
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