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Anatomy of Breast, Axilla, Chest Wall > Thoracic Wall > Flashcards

Flashcards in Thoracic Wall Deck (18)
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1

Describe the location of the intercostal veins, arteries, nerves

Between the internal intercostal muscle and the innermost (intimal) intercostal muscle

2

What anatomic structure marks the internal limit of the thoracic wall

Endothoracic Fascia

- thin fibrous layer of connective tissue that is continuous with the most internal component of the investing fascia of the intercostal muscles
- the parietal pleura rests on the endothoracic fascia

3

Name the intercostal muscles

11 pairs each, from superficial to deep:

- External intercostals (down / forward)

- Internal intercostal muscle (down / posterior)

**intercostal artery, vein, neves**

- Innermost intercostal muscles - intercostales intimi - (more vertical fibers)

** endothoracic fascia**

4

Layers of thorax at breast, from superficial to deep

Epidermis
Dermis
Sub q fat
**Anterior branch of intercostal nerve seen in sub q near lateral edge of sternum*
** Lateral branch of intercostal nerve and artery seen in sub q near lateral edge of breast**
Mammary gland, within superficial fascia
Pectoralis major
Pectoralis minor
Serratus
External intercostal
Internal intercostal
**Intercostal artery, vein, nerve*
Innermost intercostal muscle
**Endothoracic fascia*
Parietal pleura

5

Origins of the intercostal nerves

Intercostal nerves are direct continuations of the ventral primary rami of the upper 11 thoracic spinal nerves

6

posterior intercostal arteries (spaces 3-11) arise from

thoracic aorta

7

First two spaces of posterior intercostal arteries arise from

superior intercostal arteries, which come from the costocervical trunk

8

anterior intercostal arteries of **upper 5 spaces** arise from

internal thoracic (internal mammary) artery

9

anterior intercostal arteries of **lower 6 spaces**

musculophrenic artery

10

posterior intercostal VEINS drain into

azygos and hemiazygos systems

11

anterior intercostal VEINS drain into

musculophrenic and internal thoracic veins

12

superficial muscles of the pectoral region

pectoralis major
pectoralis minor
subclavius

13

two origins / divisions and insertion of pectoralis major

Origins: clavicle and sternum at 2nd-6th ribs

Insertion: crest of greater tubercle of humerus

14

anatomic landmark that defines the separation of the upper lateral border of the pectoralis major from the deltoid muscle

CEPHALIC VEIN

15

General action of pectoralis major

Brings arm across the chest

16

Origins and insertion of pectoralis minor

Origin: 2nd-5th ribs

Insertion: coracoid process of scapula

17

General action of pectoralis minor

Lower the shoulder
Accessory muscle of respiration

18

Origins and insertion of subclavius muscle

Origin: 1st rib

Insertion: inferior surface of clavicle