- Identify the deltoid muscle. (G 6.34A;N 411;Gl 21.21)
- Reflect the deltoid anteriorly and identify the axillary nerve and the posterior circumflex humeral artery (G 6.37;N 414;Gl 24.30).
Important Relationships
- The axillary nerve passes lateral to the long head of the triceps muscle (traverses the quadrangular space).
- The axillary nerve passes directly posterior to the humerus (surgical neck).
- The posterior circumflex humeral artery passes directly medial and posterior to the humerus (surgical neck).
- The posterior circumflex humeral artery passes lateral to the long head of the triceps muscle (traverses the quadrangular space).
