Podcast
Questions and Answers
What is the inferior boundary of the pectoral region?
What is the inferior boundary of the pectoral region?
- Sternum
- Clavicle
- Mid-axillary line
- 6th rib (correct)
Which muscle is considered part of the superficial layer of the pectoral region?
Which muscle is considered part of the superficial layer of the pectoral region?
- Serratus anterior
- Subclavius
- Pectoralis major (correct)
- Pectoralis minor
Which vertical line passes through the middle of the clavicle?
Which vertical line passes through the middle of the clavicle?
- Posterior axillary line
- Mid-clavicular line (correct)
- Midline
- Anterior axillary line
What is the primary action of the pectoralis major?
What is the primary action of the pectoralis major?
Which of the following structures is NOT a part of the fascia in the pectoral region?
Which of the following structures is NOT a part of the fascia in the pectoral region?
The nerve supply for pectoralis major comes from which nerves?
The nerve supply for pectoralis major comes from which nerves?
Which line runs through the anterior axillary fold?
Which line runs through the anterior axillary fold?
What action does the pectoralis minor muscle primarily perform?
What action does the pectoralis minor muscle primarily perform?
What is the primary action of the subclavius muscle?
What is the primary action of the subclavius muscle?
Which structures pierce the clavipectoral fascia?
Which structures pierce the clavipectoral fascia?
Where does the pectoralis minor attach on the scapula?
Where does the pectoralis minor attach on the scapula?
What is the innervation of the pectoralis major muscle?
What is the innervation of the pectoralis major muscle?
What ligament is formed from the thickened upper border of the clavipectoral fascia?
What ligament is formed from the thickened upper border of the clavipectoral fascia?
Which movement is specifically associated with the clavicular head of the pectoralis major?
Which movement is specifically associated with the clavicular head of the pectoralis major?
Which fascia encloses the mammary glands and cutaneous nerves?
Which fascia encloses the mammary glands and cutaneous nerves?
What does the clavipectoral fascia split to enclose?
What does the clavipectoral fascia split to enclose?
Flashcards
Subclavius Muscle
Subclavius Muscle
A small muscle that stabilizes the clavicle during shoulder movements, protects nerves and vessels.
Clavipectoral Fascia
Clavipectoral Fascia
A fibrous sheet that encloses the subclavius and pectoral minor muscles and parts of axillary structures.
Pectoralis Major
Pectoralis Major
A large chest muscle with two heads (clavicular and sternocostal) involved in shoulder movements (flexion, adduction, horizontal adduction).
Pectoralis Major Innervation
Pectoralis Major Innervation
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Clavicular Head of Pectoralis Major
Clavicular Head of Pectoralis Major
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Pectoralis Minor Attachment
Pectoralis Minor Attachment
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Accessory Muscle of Inspiration
Accessory Muscle of Inspiration
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Pectoral Region
Pectoral Region
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Boundaries of Pectoral Region
Boundaries of Pectoral Region
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Pectoralis Major
Pectoralis Major
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Pectoralis Minor
Pectoralis Minor
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Subclavius Muscle
Subclavius Muscle
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Midline
Midline
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Para-sternal line
Para-sternal line
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Mid-clavicular line
Mid-clavicular line
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Anterior axillary line
Anterior axillary line
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Mid-axillary line
Mid-axillary line
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Posterior axillary line
Posterior axillary line
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Superficial Fascia
Superficial Fascia
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Deep Fascia(Pectoral Fascia)
Deep Fascia(Pectoral Fascia)
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Clavipectoral Fascia
Clavipectoral Fascia
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Study Notes
Pectoral Region
- The pectoral region encompasses structures on the front of the upper chest (anterior thoracic wall).
- Boundaries:
- Above: Clavicle
- Below: 6th rib
- Medially: Midline
- Laterally: Mid-axillary line
Objectives
- Definition of the pectoral region
- Identifying the boundaries of the pectoral region
- Determining the layers within the pectoral region
- Listing the muscles composing the pectoral region
- Describing the fasciae of the pectoral region
Layers of the Pectoral Region
- Skin
- Superficial fascia
- Deep fascia (pectoral fascia)
- Clavipectoral fascia
Muscles of the Pectoral Region
- Pectoralis major
- Origin: Clavicular head (medial half of clavicle); sternocostal head (anterior surface of sternum, first seven costal cartilages, aponeurosis of external oblique)
- Insertion: Lateral lip of the intertubercular sulcus (bicipital groove) of the humerus
- Nerve supply: Medial and Lateral pectoral nerves
- Action: Adduction, flexion, and medial rotation of the arm; accessory muscle of inspiration
- Pectoralis minor
- Origin: Anterior surfaces and superior borders of ribs 3-5
- Insertion: Coracoid process of scapula
- Nerve supply: Medial pectoral nerve
- Action: Protraction of scapula, depression of shoulder, accessory muscle of inspiration
- Subclavius
- Origin: First rib at the costochondral junction
- Insertion: Groove on the inferior surface of the middle one-third of the clavicle (subclavius groove)
- Nerve supply: Nerve to subclavius
- Action: Stabilizes the clavicle during shoulder girdle movements; protects vessels and nerves from the bone
Fasciae of Pectoral Region
- Superficial fascia: Encloses mammary glands, platysma, and cutaneous nerves.
- Deep fascia: (pectoral fascia)
- Clavipectoral fascia: A strong fibrous sheet deep to the clavicular head of pectoralis major. Extends from pectoralis minor to clavicle, and thickens at the first rib forming the costocoracoid ligament. Attaches to the clavicle and joins the floor of axilla.
Structures Piercing Clavi-Pectoral Fascia
- Vein: Cephalic vein (terminates in axillary vein)
- Artery: Acromiothoracic artery (branch from axillary artery)
- Nerve: Lateral pectoral nerve (branch from lateral cord of brachial plexus)
- Lymphatic vessels: Enter infra-clavicular lymph nodes
Nerve Supply for Pectoralis major
- Medial and lateral pectoral nerves
Clavicular Head of Pectoralis Major
- Specifically responsible for the movement of shoulder flexion.
Pectoralis Minor Attachment on Scapula
- Coracoid process
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