pectoral and axillary regions

Question 1

platysma muscle is controlled by

Answer 1

CNVII - facial nerve (therefore a muscle of facial expression)
drapes over pectoral region - very thin

Question 2

the breast is typically found at ribs

Answer 2

2-6
extends horizontally from sternum to mid-axillary line anterior to pectoralis major
completely contained within superficial fascia

Question 3

each nipple contains _____ lactiferous ducts

each lactiferous duct drains milk from one __________

Answer 3

15-20

mammary gland

Question 4

retromammary space is found

Answer 4

between breast and breast tissue
important for mammograms, if the breast is not mobile, (due to breast cancer invading the retromammary space) it may be indicate a pathology

Question 5

arteries supplying the breast

Answer 5

perforating branches of the internal thoracic a (or internal mammary artery) (intercostal spaces 3-6)
lateral thoracic a
intercostal a

Question 6

lymphatic drainage of breast

Answer 6

75% goes to pectoral nodes (to central and apical nodes)
remaining 25% goers to
parasternal lymph nodes (can cross midline to other breast)
abdominal nodes

Question 7

a majority of breast cancers occur in what quadrant

Answer 7

upper lateral quadrant (where pectoral nodes drain)

Question 8

origin of pectoralis major

Answer 8

clavicular - medial 1/2 of clavicle
sternal - manubrium and body of sternum
costal - costal cartilages 1-6

Question 9

insertion of pectoralis major

Answer 9

1) anterior lamina from calvicular and upper sternocostal
2 ) posterior lamina from lower sternocostal part
fibers of lowest origin insert highest on the humerus

Question 10

innervation of pectoralis major

Answer 10

lateral pectoral n

medial pectoral n

Question 11

actions of pectoralis major

Answer 11

adducts and medially rotates the humerus

Question 12

deltopectoral triangle boundaries

Answer 12

define

Question 13

deltopectoral triangle contents

Answer 13

cephalic v

Question 14

pectoralis minor origin

Answer 14

ribs 2-5 or 3-6

Question 15

pectoralis minor insertion

Answer 15

coracoid process of scapula

Question 16

pectoralis minor innervation

Answer 16

medial pectoral n

Question 17

pectoralis minor actions

Answer 17

depressor/downward rotator of scapula

Question 18

medial pectoral n supplies

Answer 18

pectoralis minor and pectoralis major

Question 19

lateral pectoral n supplies

Answer 19

pectoralis major m

Question 20

anterior border of axilla

Answer 20

clavicle, pectoralis majro and minor

anterior axillary fold

Question 21

posterior border of axilla

Answer 21

scapula, subscapularis, teres major and latissimus dorsi

posterior axillary fold formed by teres major and lat dorsi

Question 22

medial wall of axilla

Answer 22

ribs, intercostal mm. serratus anterior

Question 23

lateral wall of axilla

Answer 23

intertubercular sulcus of humerus containing tendon of long head of biceps brachii

Question 24

base of axilla

Answer 24

skin and superficial fascia of armpit

Question 25

apex of axilla

Answer 25

opening bounded by clavicle, scapula, first rib

junction between axilla and neck

Question 26

contents of axilla

Answer 26

cords of brachial plexus
axillary av, LN
muscle tendons of coracobrachialis, biceps brachii (long and short head)

Question 27

branches of axillary a and their relation to pectoralis minor

Answer 27

1 before pec minor- supreme thoracic
2 under pec minor - thoracoacromial trunk, lateral thoracic a
3 lateral to pec minor - subscapular a, anterior and posterior humeral circumflex aa