Anatomy Axilla

Front 1

axilla
upper boundaries-bony

Back 1

anterior-clavicle
posterior-scapula
medial-1st rib

through the space created by these superior boundaries, contents from the neck travel into the axilla...
-cervico-axillary canal

Front 2

anterior axillary fold (wall)

Back 2

muscular
lower edge of pec major
pec minor
subclavius (partially)
double layer of specialized fascia

Front 3

double layer of specialized fascia

Back 3

costocoracoid membrane
clavipectoral fascia

Front 4

posterior wall

Back 4

combination of bone and muscle, musculoskeletal
-lat dorsi
-teres major
-subscapularis
-scapula

Front 5

medial wall

Back 5

also musculoskeletal
serratus anterior
ribs 2-6
intercostal muscles

Front 6

lateral wall

Back 6

bony, but very small
intertubercular sulcus of humerus

Front 7

where is the pec ridge?
where is the terel ridge?

Back 7

pectoral ridge is where pec major attaches o lateral lip of crest of greater tubercle
-terel ridge is where teres major attaches to intertubercular sulcus

Front 8

contents of axilla

Back 8

3 tendons of 2 muscles
-biceps (both heads)
-coracobrachialis
3 cords of brachial plexus
axillary artery
axillary vein

Front 9

clavipectoral fascia

Back 9

completely envelopes pec minor, partially envelops subclavius

Front 10

costocorocoid membrane occurs when

Back 10

there is a double layer of clavipectoral fascia between these 2 muscles

Front 11

deltopectoral triangle, costocoracoid membrane is pierced by 3 structures

Back 11

lateral pec nerve
thoracoacromial artery
cephalic vein

Front 12

major arteries of trunk, head, and upper extremity

Back 12

aorta
-left subclavian a.
-left common carotid
-brachiocephalic a.
-right subclavian a.
-right common carotid a.

Front 13

subclavian artery begins where and ends where

Back 13

begins at the aorta (L) or at the bifurcation of brachiocephalic a.
-ends at first rib

Front 14

subclavian artery is divided into 3 parts by anterior scalene m.

Back 14

1st part, before anterior scalene m.
2nd part, behind anterior scalene m.
3rd part, after anterior scalene m. but medial to 1st rib

Front 15

axillary artery

Back 15

continuation of subclavian a. lateral to 1st rib

Front 16

axillary artery has 3 parts

Back 16

1st, lateral to 1st rib, medial to pec minor
2nd, posterior to pec minor
3rd, lateral to pec minor, superomedial teres minor

Front 17

what happens when axillary artery is distal to teres minor?

Back 17

it becomes the brachial a.

Front 18

branches of axillary a.

Back 18

acromial
clavicular
pectoral
deltoid

Front 19

branches of axillary a.
3 parts

Back 19

1st, supreme thoracic a.
2nd, thoracoacromial trunk, lateral thoracic a.
3rd, anterior humeral circumflex a.
posterior humeral circumflex a.
subscapular a. (largest branch)
-thoracodorsal a.
-circumflex scapular a.

Front 20

spaces

Back 20

quadrangular space
triangular space

Front 21

quadrangular space
borders

Back 21

borders
-teres major-inrferior
-teres minor-superior
-long head of triceps-medial
-surgical neck of humerus-lateral

Front 22

quadrangular space
contents

Back 22

axillary nerve
posterior humeral circumflex a.

Front 23

triangular space
borders

Back 23

teres major-inferior
teres minor-superior
long head of triceps-lateral

Front 24

triangular space
contents

Back 24

circumflex scapular a.
what is it's parent artery?

Front 25

the apex of the axilla

Back 25

cervicoaxillary canal

Front 26

the base of the axilla forms he

Back 26

axillary fossa (armpit)

Front 27

posterior wall of axilla explained

Back 27

scapula and subscapularis are anterior surface
teres major and lat dorsi are inferior