Podcast
Questions and Answers
What is the origin of the Pectoralis Minor muscle?
What is the origin of the Pectoralis Minor muscle?
- From the medial ½ of the front of the clavicle
- From the aponeurosis of external oblique muscle
- From 3rd, 4th, & 5th ribs close to their costal cartilages (correct)
- From the upper 6 costal cartilages
What is the function of the Clavipectoral Fascia?
What is the function of the Clavipectoral Fascia?
- It fixes the clavicle during movement of the shoulder joint (correct)
- It is a muscle that adds medial rotation to the arm
- It helps in flexion of the arm
- It depresses the shoulder and draws the ribs upward and outwards during deep inspiration
What is the insertion of the Serratus Anterior muscle?
What is the insertion of the Serratus Anterior muscle?
- Lateral lip of bicipital groove
- Subclavian groove at the middle 1/3 of the inferior surface of clavicle
- Coracoid process
- Scapula (correct)
What is the nerve supply of the Pectoralis Major muscle?
What is the nerve supply of the Pectoralis Major muscle?
What is the action of the Subclavius muscle?
What is the action of the Subclavius muscle?
Which of the following nerves supplies the Pectoralis Minor muscle?
Which of the following nerves supplies the Pectoralis Minor muscle?
Which of the following structures is NOT a boundary of the Axilla?
Which of the following structures is NOT a boundary of the Axilla?
What is the action of the Serratus Anterior muscle?
What is the action of the Serratus Anterior muscle?
Which of the following muscles forms the anterior axillary fold?
Which of the following muscles forms the anterior axillary fold?
What is the name of the canal formed by the Clavicle, Scapula, and First rib?
What is the name of the canal formed by the Clavicle, Scapula, and First rib?
Which muscle is attached to the clavipectoral fascia?
Which muscle is attached to the clavipectoral fascia?
Which of the following muscles forms the anterior wall of the axilla?
Which of the following muscles forms the anterior wall of the axilla?
Which muscle forms the medial wall of the axilla?
Which muscle forms the medial wall of the axilla?
What is the relation between the subclavius muscle and the clavipectoral fascia?
What is the relation between the subclavius muscle and the clavipectoral fascia?
Which muscle is not a part of the anterior wall of the axilla?
Which muscle is not a part of the anterior wall of the axilla?
Flashcards
What are the origin points of the Pectoralis major muscle?
What are the origin points of the Pectoralis major muscle?
The Pectoralis major muscle has two heads: clavicular and sternocostal. The clavicular head originates from the medial half of the clavicle, while the sternocostal head originates from the sternum, upper six costal cartilages, and the aponeurosis of the external oblique muscle.
Where does the Pectoralis major muscle insert and what are its actions?
Where does the Pectoralis major muscle insert and what are its actions?
The Pectoralis major muscle inserts into the lateral lip of the bicipital groove and is responsible for adduction and medial rotation of the arm. The clavicular head also helps with flexion of the arm at the shoulder joint.
Where does the Pectoralis minor muscle originate and insert?
Where does the Pectoralis minor muscle originate and insert?
The Pectoralis minor muscle originates from the 3rd, 4th, and 5th ribs near their costal cartilages. It inserts into the coracoid process of the scapula.
What are the actions of the Pectoralis minor muscle?
What are the actions of the Pectoralis minor muscle?
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What is the origin and insertion of the Subclavius muscle?
What is the origin and insertion of the Subclavius muscle?
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What is the function of the Subclavius muscle?
What is the function of the Subclavius muscle?
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Where does the Serratus anterior muscle originate?
Where does the Serratus anterior muscle originate?
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Where does the Serratus anterior muscle insert?
Where does the Serratus anterior muscle insert?
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What are the actions of the Serratus anterior muscle?
What are the actions of the Serratus anterior muscle?
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Describe the shape and location of the axilla.
Describe the shape and location of the axilla.
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What structures form the apex of the axilla?
What structures form the apex of the axilla?
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What structures form the base of the axilla?
What structures form the base of the axilla?
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What are the four walls of the axilla?
What are the four walls of the axilla?
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What are the important contents of the axilla?
What are the important contents of the axilla?
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What is the brachial plexus?
What is the brachial plexus?
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Where is the brachial plexus located?
Where is the brachial plexus located?
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What are the components of the brachial plexus?
What are the components of the brachial plexus?
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What are the stages of formation of the brachial plexus?
What are the stages of formation of the brachial plexus?
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Study Notes
Pectoral Region
- Pectoralis major muscle:
- Origin: 2 heads (clavicular and sternocostal)
- Clavicular head: from medial ½ of the front of the clavicle
- Sternocostal head: from sternum, upper 6 costal cartilages, and aponeurosis of external oblique muscle
- Insertion: lateral lip of bicipital groove
- Nerve supply: medial and lateral pectoral nerves
- Action: adduction and medial rotation of the arm, clavicular head helps in flexion of the arm (shoulder)
- Pectoralis minor muscle:
- Origin: from 3rd, 4th, and 5th ribs close to their costal cartilages
- Insertion: coracoid process
- Nerve supply: medial pectoral nerve
- Action: depression of the shoulder, draws the ribs upward and outward during deep inspiration
- Subclavius muscle:
- Origin: from 1st rib at its junction with the 1st costal cartilage
- Insertion: subclavian groove at the middle 1/3 of the inferior surface of the clavicle
- Nerve supply: nerve to subclavius from upper trunk of brachial plexus
- Action: fixes the clavicle during movement of the shoulder joint
- Serratus anterior muscle:
- Origin: upper eight ribs
- Insertion: anterior aspect of the medial border and inferior angle of the scapula
- Nerve supply: long thoracic nerve
- Action: draws the scapula forward (protrusion, in boxing), rotates the scapula outward in raising the arm above 90 degrees
Axilla
- Definition: a pyramid-shaped space between the upper part of the arm and the side of the chest
- Boundaries:
- Apex: directed upwards into the root of the neck, bounded by 3 bones (clavicle, upper border of the scapula, and outer border of the first rib)
- Base: formed by skin stretching between the anterior and posterior walls
- Walls: anterior, posterior, medial, and lateral
- Contents:
- Axillary artery and its branches
- Axillary vein and its tributaries
- Axillary lymph nodes
- Brachial plexus cords and branches
- Axillary fat
- Loose connective tissue
Brachial Plexus
- Definition: a network of nerves that present at the root of the neck to enter the upper limb
- Location: posterior triangle of the neck and axilla
- Formation: union of the anterior Rami of the C 5th, 6th, 7th, and 8th and the 1st thoracic spinal nerve
- Stages:
- Roots: in the posterior triangle
- Trunks: in the posterior triangle
- Divisions: behind the clavicle (in cervico-axillary canal)
- Cords: in the axilla
- Branches: in the axilla
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Description
This quiz covers the muscles of the pectoral region, including pectoralis major and minor, and the boundaries and contents of the axilla. Students will be able to identify and describe these muscles and their origins.
