Pectoral region Flashcards
What 3 muscles are in the Pectoral region?
Pectoralis major
Pectoralis minor
Serratus anterior
What is the main actions of the Pectoralis major?
Adduct humerus at shoulder
Medially rotate humerus at shoulder
What innervates the Pectoralis major?
Medial and lateral pectoral nerves
What is the main action of the Pectoralis minor?
Depresses the shoulder
What innervates the Pecoralis minor?
Medial pectoral nerve
What is the main action of the Serratus anterior?
Rotate the scapula so it can be raised over 90 degrees.
Holds scapula against the ribcage
What innervates the Serratus anterior?
Long thoracic nerve
When does the Serratus anterior become paralysed?
With damage to the long thoracic nerve
How can the Long thoracic nerve be damaged?
Trauma
Repetitive movements
Inflammation so pressure on nerve
Why do you get winging of the scapula with damage to the long thoracic nerve?
Because Serratus anterior is paralysed it no longer holds the scapula against the rib cage
What is the most superficial muscle in the Pectoral region?
The Pectoralis major
What is the most lateral muscle in the Pectoral region?
Serratus anterior
What is posterior to the Pectoralis major?
Pectoralis minor
What is special about Serratus anterior?
It has several strips that attach to the ribs.
