Axilla boundaries

What muscles are involved with the anterior wall of the axilla

Clavicle
Pectoral muscles

Which muscles are superficial in the anterior wall of the axilla

Pectoralis major

Which muscles are deep in the anterior wall of the axilla

Pectoralis minor and subclavius

What is located in the posterior wall of the axilla

Scapula and Subscapularis

What is in the medial wall of the axilla

Ribs
Intercostal muscles
Serratus anterior

What is in the lateral wall of the axilla

The floor of the intertubercular groove/sulcus

What is at the apex of the axilla

Cervicoaxillary canal (axillary inlet)
Convergence of clavicle, scapula, and 1st rib

What is at the base (axillary fossa) of the axilla

Skin (arm pit)
Subcutaneous tissue
Axillary fascia

What are the contents of the axilla

Axillary artery and vein
Brachial plexus
Axillary lymph nodes
Coracobrachialis
Short head of biceps brachii