Identify the deltoid muscle. (G 2.38A;N 409;Gl 25.21A)
- Identify the deltoid muscle.
- Reflect the deltoid anteriorly and identify the axillary nerve and the posterior circumflex humeral artery (G 2.41;N 413;Gl 28.30B).
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).
