The axilla and pectoral region Flashcards Preview

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Flashcards in The axilla and pectoral region Deck (72)
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1

Osteology of the Pectoral Region

Clavicles
Sternum
Ribs
Scapula

2

Parts of the sternum

Manubrium, body, and xiphoid

3

"Atypical" ribs

1, 2, 11, and 12

4

"True" ribs (vertebrocostal)

Ribs 1-7

5

"False" ribs (vertebrochondral)

Ribs 8-10

6

"Floating" ribs

Ribs 11 and 12

7

Breasts

Bilateral glandular structures found in both males and females.

8

What are mammary glands?

Modified sweat glands

9

Where do breast rest?

Rest on pectoral fascia (above pectoralis major)

10

Retromammary space

Potential space between breast and pectoral fascia

11

Innervation of the Breast

Innervated by intercostal nerves (4th-6th)?
May also receive some innervation from supraclavicular nerve branches of other intercostal nerves

12

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

Suspensory ligaments (Cooper's ligaments)

13

Arterial Supply of the Breast

Mammary branches from anterior intercostal, lateral thoracic, and internal thoracic arteries.
Axillary and subclavian

14

Venous Drainage of the Breast

Mainly to axillary vein via lateral thoracic veins and medial mammary veins
Some drainage to internal thoracic vein via anterior intercostal veins

15

Why is lymphatic drainage of breast tissue important?

Due to its role in metastasis of cancer cells

16

Lymphatic drainage of nipple, areola, lactiferous lobules

Subareolar lymph nodes

17

What lymph nodes are responsible for more than 75% of lymph from breast?

Axillary lymph nodes (pectoral, central, apical)

18

Fascia of the pectoral region

Clavipectoral fascia (Pectoralis minor)
Axillary fascia
Pectoral fascia (Pectoralis major)

19

Superficial fascia

Platysma
Supraclavicular nerves
Anterior and lateral branches of intercostal nerves

20

Components of the Deltopectoral (clavipectoral) triangle

Deltoid, pectoralis major, middle 1/3 of clavicle (Make up borders)
Cephalic vein
Deltopectoral lymph nodes
Deltoid branch of thoracoacromial a. (from axillary a.)

21

Clavipectoral fascia invests..

Subclavius and pectoralis minor

22

Clavipectoral Fascia attaches to

the clavicle and anterior thoracic wall

23

What pierce the clavipectoral fascia?

Cephalic vein, thoracoacrimial artery, and lateral pectoral nerves

24

What does the clavipectoral fascia become?

Becomes suspensory ligament of axilla

25

Innervation of the muscles of the pectoral region

Innervated by the ventral rami of spinal nerves via branches of the brachial plexus

26

Proximal attachment of pectoralis major

Claviclular and sternocostal attachments
Ant. surface of medial 1/2 of clavicle
Ant. surface of sternum and superior 6 costal cartilages

27

Distal attachment of pectorallis major

Lateral lip of intertubercular sulcus (bicipital groove)

28

Actions of pectoralis major

Adducts and medial rotates humerus
Draws scapula anteriorly and inferiorly (via clavicle)
Clavicular portion flexes humerus
Sternal portion can extend humerus while it is in this flexed position

29

Innervation of pectoralis major

Lateral and medial pectoral nerves (C5, C6 clavicular portion; C7, C8, T1 sternocostal portion)

30

Proximal attachment of pectoralis minor

3rd - 5th ribs, near costal cartilage