Pectoral region

Question 1

Attachments of pectoral major (no origin)

Answer 1

Clavicular head attaches to clavicle,
Sternocostal head attaches to sternum and ribs,
Fibres from both heads attach to Intertubercular groove of humerus

Question 2

Actions of pec major

Answer 2

Adduction of arm at shoulder,
Medial rotation of arm at shoulder,
Flexion of arm (Clavicular head only)

Question 3

Innervation of pec major

Answer 3

Medial and lateral pectoral nerves

Question 4

Origin of pec minor

Answer 4

Ribs 3-5

Question 5

Attachment of pec minor

Answer 5

Coracoid process of scapula

Question 6

Action of pec minor

Answer 6

Depression of shoulder

Question 7

Innervation of pec minor

Answer 7

Medial pectoral nerve

Question 8

Origin of serratus anterior

Answer 8

Ribs 2-8

Question 9

Attachment of serratus anterior

Answer 9

Costal surface of medial border of scapula

Question 10

Actions of serratus anterior

Answer 10

Rotates the scapula (which allows abduction >90),
Holds the scapula against rib cage (useful when arm reaches anteriorly e.g. Punching - boxers therefore have a prominent serratus anterior)

Question 11

Innervation of serratus anterior

Answer 11

Long thoracic nerve

Question 12

Muscles of the pectoral region

Answer 12

Pec major,
Pec minor,
Serratus anterior