Pectoral Region

Question 0

Roughly where does Pectoralis major originate and extend to?

Answer 0

Originates medially along the manibrium and sternum from the 1-6th rib. Extends to lateral clavicle and attaches to proximal humerus.

Question 1

What muscles are involved in the pectoral region?

Answer 1

Pectoralis major.
Pectoralis minor.
Subclavious.
Serratus anterior.

Question 2

What are the 2 heads of Pectoralis major called?

Answer 2

Clavicular and sternocostal head.

Question 3

What action does pectoralis major perform?

Answer 3

Adduction and medial rotation of arm.
Clavicular head flexes humerus.
Sternocostal head extends humerus.

Question 4

What is the nerve supply for pectoralis major, pectoralis minor, subclavious and serratus anterior?

Answer 4

Pec major- lateral and medial pectoral nerve.
Pec minor- medial pectoral nerve.
Subclavious- nerve to subclavious.
Serratus anterior- long thoracic nerve.

Question 5

Roughly where is pectoralis minor found?

Answer 5

Anterior chest. 3-5th rib and across to coracoid process.

Question 6

What is the role of pectoralis minor?

Answer 6

Stabilises the scapula.

Question 7

Where is subclavious found?

Answer 7

Inferior to the clavicle. Extends from the manibrium to the acromium.

Question 8

What is the role of subclavious?

Answer 8

Stabilises the clavicle and prevents dislocation.

Question 9

What movement does serratus anterior permit?

Answer 9

Strong protractor of the scapula.

Question 10

What are the spinal routes for the pectoral muscles?

Answer 10

Pec major- clavicular head is C5&6, sternocostal head is C7,8 & T1.
Pec minor- C8 & T1.
Subclavious- C5&6.
Long thoracic nerve- C5,6&7.