Podcast
Questions and Answers
Which action is NOT a responsibility of the Pectoralis Major muscle?
Which action is NOT a responsibility of the Pectoralis Major muscle?
Contraction of the External Intercostals results in what movement?
Contraction of the External Intercostals results in what movement?
Which of the following muscles has its primary function the protraction of the scapula?
Which of the following muscles has its primary function the protraction of the scapula?
Which of the following muscles opposes the action of the Rhomboids Major and Minor?
Which of the following muscles opposes the action of the Rhomboids Major and Minor?
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Which muscle is located directly underneath the Pectoralis Major?
Which muscle is located directly underneath the Pectoralis Major?
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Which muscle is responsible for depressing the clavicle?
Which muscle is responsible for depressing the clavicle?
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Which of the following muscles does NOT contribute to the flexion of the vertebral column?
Which of the following muscles does NOT contribute to the flexion of the vertebral column?
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What is the thick band of connective tissue that runs down the center of the abdomen called?
What is the thick band of connective tissue that runs down the center of the abdomen called?
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Which muscle extends the arm at the shoulder joint?
Which muscle extends the arm at the shoulder joint?
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What is the primary action of the serratus anterior muscle?
What is the primary action of the serratus anterior muscle?
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Which muscle functions as both an extensor of the neck and an elevator of the scapula?
Which muscle functions as both an extensor of the neck and an elevator of the scapula?
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Which muscle is NOT part of the rotator cuff group?
Which muscle is NOT part of the rotator cuff group?
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What is the function of the quadratus lumborum muscle?
What is the function of the quadratus lumborum muscle?
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What is the shared action of the teres major and latissimus dorsi muscles?
What is the shared action of the teres major and latissimus dorsi muscles?
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Which muscle is located on the anterior side of the body?
Which muscle is located on the anterior side of the body?
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What is the common function of the rhomboid major and rhomboid minor muscles?
What is the common function of the rhomboid major and rhomboid minor muscles?
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Flashcards
Pectoralis Major
Pectoralis Major
Large chest muscle responsible for arm flexion, adduction, and medial rotation.
External Intercostals
External Intercostals
Muscles located between ribs that elevate ribs during inhalation.
Internal Intercostals
Internal Intercostals
Muscles that depress ribs during forced exhalation.
Serratus Anterior
Serratus Anterior
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Pectoralis Minor
Pectoralis Minor
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Rectus Abdominis
Rectus Abdominis
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Transversus Abdominis
Transversus Abdominis
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Linea Alba
Linea Alba
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Trapezius Muscle
Trapezius Muscle
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Infraspinatus Muscle
Infraspinatus Muscle
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Teres Minor Muscle
Teres Minor Muscle
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Teres Major Muscle
Teres Major Muscle
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Latissimus Dorsi Muscle
Latissimus Dorsi Muscle
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Rhomboid Muscles
Rhomboid Muscles
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Supraspinatus Muscle
Supraspinatus Muscle
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Rotator Cuff Muscles
Rotator Cuff Muscles
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Study Notes
Muscles of the Anterior Thorax
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Pectoralis Major: large muscle on the anterior chest, responsible for:
- Arm flexion at the shoulder joint
- Arm adduction (pulling arm towards the body) at the shoulder joint
- Medial rotation of the arm at the shoulder joint
- Synergists: Coracobrachialis, Latissimus Dorsi, Teres Major, Subscapularis
- Antagonists: Teres Major, Latissimus Dorsi (for extension), Deltoid, Supraspinatus (for abduction), Infraspinatus, Teres Minor (for lateral rotation)
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External Intercostals: located between ribs, help to:
- Elevate ribs during inhalation
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Internal Intercostals: located between ribs, help to:
- Depress ribs during forced exhalation
- Antagonists: External Intercostals
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Serratus Anterior: located on the side of the chest, responsible for:
- Protraction of the scapula (moving scapula forward)
- Synergists: Pectoralis Minor
- Antagonists: Rhomboids major & minor, Trapezius
- Also functions in scapular protraction
Deeper Muscles of the Anterior Thorax
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Pectoralis Minor: located underneath Pectoralis Major, responsible for:
- Protraction of the scapula (moving scapula forward)
- Synergists: Serratus Anterior
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Subclavius: located beneath the clavicle, responsible for:
- Depression of the clavicle
Muscles of the Abdominal Wall
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External Oblique: most superficial abdominal muscle, responsible for:
- Flexion of the vertebral column
- Compressing abdominal contents to increase intra-abdominal pressure and assist in forced exhalation
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Internal Oblique: located underneath External Oblique, responsible for:
- Flexion of the vertebral column
- Compressing abdominal contents to increase intra-abdominal pressure and assist in forced exhalation
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Rectus Abdominis: located between External and Internal obliques, responsible for:
- Flexion of the vertebral column
- Compressing abdominal contents to increase intra-abdominal pressure and assist in forced exhalation
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Transversus Abdominis: deepest layer of abdominal wall, responsible for:
- Compressing abdominal contents to increase intra-abdominal pressure and assist in forced exhalation
- Does not flex the vertebral column
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Linea Alba: thick band of connective tissue down the center of the abdomen, where some abdominal muscles insert.
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Pyramidalis: small triangular muscle between pubic bone and Linea Alba, functions to tense the Linea Alba.
Muscles of the Posterior Thorax
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Trapezius: large muscle with three portions (descending, transverse, and ascending), responsible for:
- Elevating the scapula
- Extending the neck
- Retracting the scapula
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Infraspinatus: located on the posterior side of the scapula, responsible for:
- Lateral (external) rotation of the shoulder joint
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Teres Minor: small muscle inferior to the infraspinatus, responsible for:
- Lateral (external) rotation of the shoulder joint
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Teres Major: Located inferior to the teres minor, responsible for:
- Extending the arm at the shoulder joint
- Adducting the shoulder joint
- Medially rotating the shoulder
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Latissimus Dorsi: large muscle covering the lower back, responsible for:
- Extending the arm at the shoulder joint
- Adducting the shoulder joint
- Medially rotating the shoulder
- Origin: Thoracolumbar fascia
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Rhomboid Muscles (major & minor): responsible for:
- Retracting the scapula
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Erector Spinae Muscles (spinalis, longissimus, iliocostalis): responsible for:
- Extending the vertebral column and neck
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Serratus Posterior Inferior: Located on the lower back, responsible for:
- Extension of the vertebral column
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Quadratus Lumborum: Located on the lower back, responsible for:
- Extending the lower back
- Fixating (stabilizing) the ribs
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Supraspinatus: Located in the supraspinous fossa of the scapula, responsible for:
- Abduction (movement away from the midline) of the arm at the shoulder joint
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Subscapularis: Located in the subscapular fossa of the scapula, part of the rotator cuff
Rotator Cuff
- Rotator Cuff: comprised of: Supraspinatus, Infraspinatus, Teres minor, Subscapularis
- Function: Stabilize the shoulder joint
Other
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Thoracolumbar Fascia: Aponeurosis (connective tissue sheet) serving as an origin for the latissimus dorsi muscle
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Splenius Capitis: Extends the neck
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Description
Test your knowledge of the muscles located in the anterior thorax, including their functions, synergists, and antagonists. This quiz covers key muscles such as the Pectoralis Major, External and Internal Intercostals, and Serratus Anterior. Enhance your understanding of muscular anatomy and its roles in movements.
