Pectoral Region Flashcards
What is the origin of pec major?
Clavicular head: medial 1/3 of clavicle
Sternal head: from costal margin of sternum and 2nd to 6th costal cartilages
What is insertion of pec major?
Lateral lip of intertubercular sulcus (bicipital groove)
What innervates pec major?
Medial and lateral pectoral nerves
Spinal level of pec major?
C6/7/8
Action of pec major?
Adduction. Think bowling, flex an extended arm and extend a flexed arm. Medial rotation.
Origin and insertion of pec minor?
Origin: Ribs 2-5
Insertion: Coracoid process of scapula
What innervates pec minor?
Medial and lateral pectoral nerves.
Spinal level of pec minor?
C7
Action of pec minor?
Protract scapula and elevate ribs. Aids in breathing when we put our hands on top of our head such as after running.
Origin and insertion of subclavius?
Origin: superior surface of first rib near costocartilage junction
Insertion: middle 1/3 of clavicle
What innervates subclavius?
Nerve to subclavius.
Spinal levels of subclavius?
C5/6
Action of subclavius?
Depress clavicle.
Origin and insertion of serratus anterior?
Origin: upper 9 ribs
Insertion: ventral aspect of medial border of scap
What innervates serratus anterior?
Long thoracic nerve
What is spinal level of serratus anterior?
C6
What action does serratus anterior perform?
Protracts the scapula.
Upward rotation of glenoid fossa.
What commonly gets injured due to winging of the scapula?
Long thoracic nerve.
Main lymph drainage sites in pectoral region?
Central Axillary lymph nodes.
Parasternal lymph nodes.
What separates deltoid and pectoralis major muscles?
Cephalic vein.
Supraclavicular nerve dermatomes?
C3/4
Upper lateral brachial cutaneous nerve dermatome?
C5
Intercostobrachial nerve dermatome?
T2
Medial branch cutaneous nerve dermatomes?
T1
Lower lateral brachial cutaneous nerve dermatome?
C5/6
Posterior antebrachial cuteanous nerve dermatome?
C6/7
