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Questions and Answers
What is the correct term for the uppermost point in a structure that has a defined apex, base, and four walls?
What is the correct term for the uppermost point in a structure that has a defined apex, base, and four walls?
- Base
- Boundary
- Floor
- Apex (correct)
Which structure serves as the floor of the region described?
Which structure serves as the floor of the region described?
- Scapula
- Clavicle
- Axillary fascia (correct)
- First rib
Which boundary corresponds to the outer edge of the first rib?
Which boundary corresponds to the outer edge of the first rib?
- Laterally
- Posteriorly
- Medially (correct)
- Anteriorly
What forms the apex boundary of the region mentioned?
What forms the apex boundary of the region mentioned?
Which of the following correctly describes one of the walls of the structure based on the provided information?
Which of the following correctly describes one of the walls of the structure based on the provided information?
Which structure is NOT supplied by the network of nerves formed by C5, C6, C7, C8, and T1?
Which structure is NOT supplied by the network of nerves formed by C5, C6, C7, C8, and T1?
What are the five stages of the nerve network formed by C5, C6, C7, C8, and T1?
What are the five stages of the nerve network formed by C5, C6, C7, C8, and T1?
Which anatomical structure is associated with the axilla and contributes to the upper limb's nerve supply?
Which anatomical structure is associated with the axilla and contributes to the upper limb's nerve supply?
What is the primary role of the network of nerves formed by C5, C6, C7, C8, and T1?
What is the primary role of the network of nerves formed by C5, C6, C7, C8, and T1?
Which muscle is uniquely exempt from being supplied by the nerve network formed by C5 to T1?
Which muscle is uniquely exempt from being supplied by the nerve network formed by C5 to T1?
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Study Notes
Axilla
- The axilla is a pyramidal shaped space that has an apex, a base and four walls
- The apex of the axilla is bounded by:
- The middle third of the clavicle (anteriorly)
- The outer border of the first rib (medially)
- The upper border of the scapula (posteriorly)
- The base (floor) of the axilla is formed by skin, superficial fascia and axillary fascia
- The axilla contains the axillary vein, axillary lymph nodes, axillary tail of the breast, and fatty tissue
- The brachial plexus (network of nerves) is found in the axilla and is formed by nerves C5, C6, C7, C8, and T1
- The brachial plexus supplies the entire upper limb except for the trapezius muscle
- The brachial plexus has 5 stages:
- Roots: located in the neck above the clavicle (supraclavicular part)
- Trunks: located in the neck above the clavicle (supraclavicular part)
- Divisions: located behind the clavicle (retro-clavicular part)
- Cords: located in the axilla (infraclavicular part)
- Branches: located in the axilla (infraclavicular part)
Axillary Artery
- The axillary artery is a continuation of the subclavian artery and begins at the lateral border of the first rib
- The axillary artery changes its name to the brachial artery at the lower border of the teres major muscle
Axillary Vein
- The axillary vein lies along the medial side of the axillary artery and is a continuation of the basilic vein
- The axillary vein begins at the inferior border of the teres major muscle
- The axillary vein ends at the lateral border of the first rib, where it becomes the subclavian vein
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