23 Questions
Which muscle shares in the formation of the medial wall of the axilla?
Pectoralis minor
What is the root value of the lateral cord of the brachial plexus?
C 5, 6, 7
Which group of axillary lymph nodes receives lymphatic drainage directly from the tail of the breast?
Posterior (Subscapular) group
Which structure is not listed as a content of the axilla?
Radial nerve
In the labeled diagram provided, which number corresponds to the axillary vein?
2
Which structure forms the apex of the axilla?
Clavicle
What muscle contributes to both the anterior and posterior walls of the axilla?
Subscapularis
Which structure is NOT a main content of the axilla?
Humerus
Which muscle is part of the lateral wall of the axilla?
Coracobrachialis
Which nerve innervates the small skin and muscles of the back of the trunk?
Dorsal ramus
Which muscle contributes to both the anterior wall and posterior wall of the axilla?
Teres major
What is formed by the ventral rami of C5, 6, 7, 8 & T1 nerves?
Brachial plexus
Which trunk of the brachial plexus is formed by C8 & T1 nerves?
Lower trunk
Which part of the brachial plexus is formed by the anterior divisions of the upper and middle trunks?
Lateral cord
Where do the supraclavicular roots and trunks lie?
Above the clavicle
Which group of axillary lymph nodes is located in front of the subscapularis muscle?
Posterior (Subscapular) group
Where is the central group of axillary lymph nodes located?
Inside the axilla
Where do the central group lymph nodes lie?
In the center of the axilla in the axillary fat
Which group drains lymph vessels directly from the breast?
Apical (subclavicular) group
What is a common clinical manifestation of breast cancer in relation to lymph nodes?
Painful enlargement of axillary lymph nodes
Which group receives most of the lymph vessels from the upper limb?
Central group
What is the significance of examining axillary lymph nodes in relation to breast cancer?
To aid in diagnosis and staging of breast cancer
Where are the Infraclavicular (deltopectoral) lymph nodes located?
In the groove between deltoid and pectoralis major muscle
Study Notes
Axilla Formation and Walls
- The teres major muscle shares in the formation of the medial wall of the axilla.
- The serratus anterior muscle contributes to both the anterior and posterior walls of the axilla.
- The pectoralis minor muscle forms the anterior wall of the axilla.
- The subscapularis muscle contributes to the posterior wall of the axilla.
Brachial Plexus
- The lateral cord of the brachial plexus has a root value of C5-6.
- The medial cord of the brachial plexus has a root value of C8-T1.
- The brachial plexus is formed by the ventral rami of C5, 6, 7, 8, and T1 nerves.
- The lateral cord is formed by the anterior divisions of the upper and middle trunks.
- The medial cord is formed by the anterior division of the lower trunk.
Axillary Lymph Nodes
- The central group of axillary lymph nodes receives lymphatic drainage directly from the tail of the breast.
- The central group of axillary lymph nodes is located behind the pectoralis minor muscle.
- The infraclavicular (deltopectoral) lymph nodes are located superficially in the deltopectoral groove.
- The apical group of axillary lymph nodes receives most of the lymph vessels from the upper limb.
Clinical Significance
- Examining axillary lymph nodes is significant in relation to breast cancer, as they can be affected by it.
- A common clinical manifestation of breast cancer in relation to lymph nodes is the presence of palpable axillary lymph nodes.
Test your knowledge on the anatomy of axillary lymph nodes, including their location, drainage pathways, and group divisions. Learn about the different groups of axillary lymph nodes and the organs that drain into each group.
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