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Questions and Answers
What is the origin of the Pectoralis major's clavicular head?
What is the origin of the Pectoralis major's clavicular head?
Where does the Pectoralis minor insert?
Where does the Pectoralis minor insert?
What is the origin of the Subclavius muscle?
What is the origin of the Subclavius muscle?
Which of the following muscles originates from the upper 8 ribs?
Which of the following muscles originates from the upper 8 ribs?
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What are the points of origin for the Deltoid muscle?
What are the points of origin for the Deltoid muscle?
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What is the origin of the trapezius muscle?
What is the origin of the trapezius muscle?
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Which of the following muscles is considered part of the superficial layer of back muscles?
Which of the following muscles is considered part of the superficial layer of back muscles?
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Where are the upper fibers of the trapezius muscle inserted?
Where are the upper fibers of the trapezius muscle inserted?
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Which rotator cuff muscle inserts at the lesser tuberosity of the humerus?
Which rotator cuff muscle inserts at the lesser tuberosity of the humerus?
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What structure does the latissimus dorsi originate from?
What structure does the latissimus dorsi originate from?
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Study Notes
Muscles of the Pectoral Region, Shoulder, and Back
- Pectoral Region: The pectoral region muscles include: Pectoralis major, Pectoralis minor, and Subclavius.
- Shoulder Muscles: The shoulder muscles include: Deltoid.
- Rotator Cuff Muscles: Rotator cuff muscles include: Subscapularis, Supraspinatus, Infraspinatus, and Teres Major and Teres Minor.
- Back Muscles: The back muscles include: Trapezius, Latissimus dorsi, Levator scapulae, and Rhomboids (minor and major).
- Learning Objectives: Students will be able to classify and locate the muscles mentioned above and understand their attachment to upper limb bones.
Pectoralis Major
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Origin:
- Clavicular head: medial half of the anterior aspect of the clavicle.
- Sternocostal head: lateral half of the anterior surface of the sternum, upper 6 costal cartilages.
- Insertion: Lateral lip of the bicipital groove.
Pectoralis Minor
- Origin: 3rd, 4th, and 5th ribs, near their costal cartilages.
- Insertion: Medial border and upper surface of the coracoid process of the scapula.
Subclavius Muscle
- Origin: First rib at its costochondral junction.
- Insertion: Subclavius groove on the lower surface of the clavicle.
Serratus Anterior
- Origin: 8 fleshy digitations from the upper 8 ribs.
- Insertion: Ventral surface of the medial border of the scapula and ventral surface of the inferior angle.
Deltoid
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Origin:
- Lateral third of the clavicle
- Acromion
- Lower lip of the spine of the scapula.
- Insertion: Deltoid tuberosity of the humerus.
Rotator Cuff Muscles
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Subscapularis:
- Origin: Medial 2/3 of the subscapular fossa.
- Insertion: Lesser tuberosity of the humerus.
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Supraspinatus:
- Origin: Supraspinous fossa.
- Insertion: Greater tuberosity of the humerus.
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Infraspinatus:
- Origin: Infraspinous fossa.
- Insertion: Greater tuberosity of the humerus.
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Teres Major:
- Origin: Lower 1/3 of the dorsal surface of lateral border of scapula.
- Insertion: Medial lip of the intertubercular groove of humerus.
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Teres Minor:
- Origin: Upper 2/3 of lateral border of the scapula.
- Insertion: Lower impression of the greater tuberosity of the humerus.
Back Muscles
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Trapezius:
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Origin:
- Medial third of the superior nuchal line.
- External occipital protuberance.
- Ligamentum nuchae.
- Spinous processes of the 7th cervical vertebra and thoracic vertebrae.
- Supraspinous ligaments
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Insertion:
- Upper: Posterior border of the lateral third of the clavicle.
- Middle: Medial margin of the acromion.
- Lower: Upper border of the crest of the spine of the scapula.
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Origin:
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Latissimus Dorsi:
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Origin:
- Lower six thoracic spines and their supraspinous ligaments, deep to the trapezius
- Posterior part of the outer lip of the iliac crest.
- Lower three or four ribs.
- Dorsal surface of the inferior angle of the scapula.
- Insertion: Floor of the bicipital groove of the humerus.
-
Origin:
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Levator Scapulae:
- Origin: Transverse processes of C1-C4.
- Insertion: Superior angle of scapula.
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Rhomboids (minor & major):
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Rhomboid Minor:
- Origin: Lower part of the ligamentum nuchae, 7th cervical vertebra and 1st thoracic vertebrae and their supraspinous ligament.
- Insertion: Dorsal surface of the medial margin of the scapula at the root of the scapular spine.
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Rhomboid Major:
- Origin: Spinous processes of T2-T5 vertebrae and their supraspinous ligaments.
- Insertion: Dorsal surface of the medial border of the scapula from the root of the spine to the inferior angle.
-
Rhomboid Minor:
Nerve Supply
- The presentation includes nerve supply information for each muscle.
Additional Notes
- Scapula: The scapula is a bony structure in the shoulder region.
- Clavicle: The clavicle is a bone connecting the sternum to the scapula.
- Humerus: The humerus is the bone of the upper arm.
- Other Bones: There are other bones referenced, including the ribs and vertebrae.
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Description
This quiz covers the muscles of the pectoral region, shoulder, and back. Students will learn to classify and locate key muscles including the pectoralis major, deltoid, and trapezius, as well as their anatomical attachments. Test your knowledge of muscle origins and insertions in this essential anatomy quiz.
