Pectoral and axillary regions

Question 1

Retromammary space

Answer 1

Potential space between breast and pectoral fascia

Question 2

Innervation of breast?

Answer 2

Intercostal nerves 4-6

Question 3

How does the breast attach to the dermis of overlying skin?

Answer 3

Via suspensory ligaments

Question 4

Blood supply of breast?

Answer 4

Anterior intercostal, lateral thoracic, and internal thoracic

Question 5

-Most of lymph drains via what LNs?

Answer 5

Axillary LNs

Question 6

Borders of deltopectoral triangle?

Answer 6

Deltoid, pec major, and middle clavicle

Question 7

Contents of deltopectoral triangle?

Answer 7

• Cephalic veins
• Deltopectoral LNs
• Deltoid branch of thoracoacromial a. (from axillary a.)

Question 8

Pectoralis major actions?

Answer 8

• Adduct and medially rotate humerus
• Draw scapula anteriorly and inferiorly
• Clavicular portion flexes humerus
• Sternal portion extends humerus

Question 9

Innervation of pectoralis major?

Answer 9

-Lateral and medial pectoral nerves (C5-C8, T1)

Question 10

Pec minor action?

Answer 10

Stabilizes the scapula

Question 11

Innervation of pec minor?

Answer 11

Medial pectoral nerve

Question 12

Subclavius actions?

Answer 12

Anchor and depress clavicle

Question 13

Innervation of subclavius?

Answer 13

Nerve to subclavius

Question 14

Vascularization of subclavius?

Answer 14

Clavicular branch of thoracoacromial trunk

Question 15

The breast-What is it?

Answer 15

• Cutaneous structure
• Modified sweat gland
• Rests on pectoral fascia