Podcast
Questions and Answers
Which structure forms the base (floor) of the axilla?
Which structure forms the base (floor) of the axilla?
What is the correct order of vessel transition in the axilla?
What is the correct order of vessel transition in the axilla?
Which group is NOT one of the five groups of axillary lymph nodes?
Which group is NOT one of the five groups of axillary lymph nodes?
Which nerve is associated with the anterior wall of the axilla?
Which nerve is associated with the anterior wall of the axilla?
Signup and view all the answers
What marks the lower limit of the axilla?
What marks the lower limit of the axilla?
Signup and view all the answers
Which muscle forms the main part of the anterior wall of the axilla?
Which muscle forms the main part of the anterior wall of the axilla?
Signup and view all the answers
What structure provides support between the clavicle and the pectoral muscles in the anterior wall of the axilla?
What structure provides support between the clavicle and the pectoral muscles in the anterior wall of the axilla?
Signup and view all the answers
Which of the following structures is NOT part of the anterior wall of the axilla?
Which of the following structures is NOT part of the anterior wall of the axilla?
Signup and view all the answers
Which nerve is associated with the anterior wall of the axilla?
Which nerve is associated with the anterior wall of the axilla?
Signup and view all the answers
What role does the clavipectoral fascia serve in the axilla?
What role does the clavipectoral fascia serve in the axilla?
Signup and view all the answers
Which muscle is NOT part of the anterior wall of the axilla?
Which muscle is NOT part of the anterior wall of the axilla?
Signup and view all the answers
What forms the base (or floor) of the axilla?
What forms the base (or floor) of the axilla?
Signup and view all the answers
Which structure is located at the apex of the axilla?
Which structure is located at the apex of the axilla?
Signup and view all the answers
Which of the following statements about the axilla is FALSE?
Which of the following statements about the axilla is FALSE?
Signup and view all the answers
Which muscles comprise the posterior wall of the axilla?
Which muscles comprise the posterior wall of the axilla?
Signup and view all the answers
What forms the lateral wall of the axilla?
What forms the lateral wall of the axilla?
Signup and view all the answers
Which structure does NOT serve as a boundary of the axilla?
Which structure does NOT serve as a boundary of the axilla?
Signup and view all the answers
Which is the correct description of the axilla's shape?
Which is the correct description of the axilla's shape?
Signup and view all the answers
Study Notes
Axilla Site and Boundaries
- The axilla is a pyramidal region situated between the chest wall and the upper part of the medial side of the arm.
- The axilla has four sides: anterior, posterior, lateral, and medial, forming a pyramid.
- The apex of the axilla is a triangular interval, a communication point between the axilla and the neck, where axillary vessels and nerves enter the axilla.
- The apex is bounded by the first rib, the superior border of the scapula, and the posterior surface of the clavicle.
- The anterior wall is divided into two layers: the superficial layer formed by the pectoralis major muscle and the deep layer formed by the subclavius muscle, the clavi-pectoral fascia, the pectoralis minor muscle, and the suspensory ligament of the axilla.
- The posterior wall is formed by the subscapularis, teres major, and latissimus dorsi muscles.
- The lateral wall is the narrowest and is formed by the bicipital groove of the humerus, the short head of the biceps muscle, and the coracobrachialis muscle.
- The medial wall is formed by the upper four ribs and their intercostal muscles, as well as the upper part of the serratus anterior muscle.
- The base (floor) of the axilla is formed by skin, superficial fascia, and the deep axillary fascia.
Contents Of The Axilla
- The axilla contains vessels, nerves, lymph nodes, and special contents.
- The vessels include the axillary artery and its branches, as well as the axillary vein and its tributaries.
- The nerves include the cords of the brachial plexus, and the long thoracic and intercostobrachial nerves.
- The lymph nodes are divided into five groups: anterior, posterior, lateral, central, and apical.
- The special contents of the axilla include the tail of the mammary gland, axillary fat, and loose areolar tissue.
Brachial Plexus
- The axillary artery begins at the outer border of the first rib as the continuation of the subclavian artery and ends at the lower limit of the axilla, where it becomes the brachial artery.
- The axillary vessels and brachial plexus run down the lateral wall of the axilla, closer to the anterior wall.
- The brachial plexus is a network of nerves that originates from the ventral rami of the spinal nerves C5-T1.
- The brachial plexus is organized into roots, trunks, divisions, cords, and branches.
- The roots are the beginning of the plexus and are formed by the ventral rami of the spinal nerves C5-T1.
- The trunks are formed by the union of the roots.
- The divisions are formed by the division of the trunks into anterior and posterior divisions.
- The cords are formed by the union of the divisions.
- The branches are the final part of the plexus and supply the muscles and skin of the upper limb.
Branches of the Brachial Plexus
- The brachial plexus branches into five main branches: dorsal scapular nerve, suprascapular nerve, long thoracic nerve, thoracodorsal nerve, and subscapular nerve.
- These branches provide innervation to muscles in the scapula, the chest, and the back.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz covers the anatomy of the axilla, including its boundaries and structural components. Explore the four sides of this pyramidal region and the muscles that form its walls. Gain insight into the communication between the axilla and the neck along with the significance of the apex.
