1. Axillary Artery
   1. from outer border of first rib
   2. from subclavian artery
   3. enters axilla through apex
   4. runs along lateral wall
2. course
   1. pectoralis minor
      1. above,deep
      2. behind,deep
      3. below,superficial
3. Relations of 1st part
   1. Anterior
      1. skin & fascia
      2. clavicular head of P.Major
      3. clavipectoral fascia
      4. communicating loop
   2. Posterior
      1. 1st digitation of serratus anterior
      2. 1st intercostal space
      3. nerve to serratus anterior
      4. med. cord of brachial plexus
   3. Medial
      1. axillar vein
      2. apical axillary L.N group
   4. Lateral
      1. lat. & post. cords of brachial plexus
4. Relations of 2nd part
   1. Anterior
      1. skin, superficial & deep fascia
      2. pectoralis minor
      3. pectoralis major
   2. Posterior
      1. subscapularis
      2. post. cord of brachial plexus
   3. Medial
      1. med. cord of brachial plexus
      2. axillary nerve
   4. Lateral
      1. lat. cord of brachial plexus
      2. corachobrachialis
5. Relations of 3rd part
   1. Anterior
      1. upper part :
         1. skin & fascia
         2. pectoralis major
         3. med. root of median n.
      2. lower part
         1. skin & fascia ONLY
   2. Posterior
      1. radial & axillary n.
      2. subscapularis
      3. teres major
   3. Medial
      1. med. cutaneous n. of forearm
      2. med. cutaneous n. of arm
      3. ulnar n.
      4. axillary vein
   4. Lateral
      1. chorachobrachialis, seperated by:
      2. -musculacutaneous n.
      3. -lat. root of median n.
      4. -median n.
6. Banch of 1st part
   1. sup. thoracic a.
      1. along upper border of pectoralis minor
      2. supply upper pt. of med. wall of axilla
7. Branches of 2nd part
   1. lat. thoracic a.
      1. lower border of pectoralis minor
      2. sends external mammary branches to breast
   2. acromio-thoracic a.
      1. acromial branch
         1. into deltoid to acromion
      2. pectoral branch
         1. btwn pectoralis major & minor
      3. clavicular branch
         1. nutrient a. of clavicle
      4. deltoid branch
         1. in deltopectoral groove
8. Branches of 3rd part
   1. ant. circumflex humeral a.
      1. in front of surgical neck
      2. enters cruciate anastomose
   2. post. circumflex humeral a.
      1. pass axillary n. in quadriangular space
      2. curves around surgical neck
      3. enters cruciate anastomose
   3. subscapular a.
      1. *largest branch
      2. lower border of subscapularis
      3. continue as thoracodorsal a.
      4. pierce latissimus dorsi