Muscles of the Pectoral Girdle - Lab Exam 2 Study Guide

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Last updated 6:31 PM on 5/23/26

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11 Terms

1

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Deltoid *

O: spine of scapula

I: deltoid tuberosity of humerus

A: abducts shoulder

<p>O: spine of scapula</p><p>I: deltoid tuberosity of humerus</p><p>A: abducts shoulder</p>

2

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Anterior side:

- Pectoralis Major *

O: sternum; upper costal cartilages

I: intertubercular groove of humerus

A: flex shoulder; adduct shoulder

<p>O: sternum; upper costal cartilages</p><p>I: intertubercular groove of humerus</p><p>A: flex shoulder; adduct shoulder</p>

3

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Anterior side:

- Pectoralis Minor

O: ribs 3,4,5

I: coracoid process of scapula

A: protract scapula; depress scapula

<p>O: ribs 3,4,5</p><p>I: coracoid process of scapula</p><p>A: protract scapula; depress scapula</p>

4

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Anterior side:

- Serratus Anterior

O: ribs 1-8

I: medial border of scapula

A: protract scapula

<p>O: ribs 1-8</p><p>I: medial border of scapula</p><p>A: protract scapula</p>

5

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Rotator Cuff Muscles;

- Supraspinatus

O: supraspinous fossa of scapula

I: greater tubercle of humerus

A: stabilize humerus

<p>O: supraspinous fossa of scapula</p><p>I: greater tubercle of humerus</p><p>A: stabilize humerus</p>

6

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Rotator Cuff Muscles;

-Infraspinatus

O: infraspinous fossa of scapula

I: greater tubercle of scapula

A: stabilizes humerus

<p>O: infraspinous fossa of scapula</p><p>I: greater tubercle of scapula</p><p>A: stabilizes humerus</p>

7

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Rotator Cuff Muscles;

- Subscapularis

O: subscapular fossa of scapula

I: lesser tubercle of scapula

A: stabilizes humerus; rotate shoulder medially

<p>O: subscapular fossa of scapula</p><p>I: lesser tubercle of scapula</p><p>A: stabilizes humerus; rotate shoulder medially</p>

8

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Posterior side:

- Trapezius

O: thoracic & cervical vertebrae; occipital bone

I: spine of scapula; clavicle

A: rotate scapula ; retract scapula

<p>O: thoracic & cervical vertebrae; occipital bone</p><p>I: spine of scapula; clavicle</p><p>A: rotate scapula ; retract scapula</p>

9

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Posterior side:

- Rhomboideus *

O: thoracic vertebrae

I: medial border of scapula

A: stabilize scapula; retract scapula

<p>O: thoracic vertebrae</p><p>I: medial border of scapula</p><p>A: stabilize scapula; retract scapula</p>

10

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Posterior side:

- Teres Major

O: scapula

I: lesser tubercle of humerus

A: extend shoulder; adduct shoulder

<p>O: scapula</p><p>I: lesser tubercle of humerus</p><p>A: extend shoulder; adduct shoulder</p>

11

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Posterior side:

- Latissimus Dorsi

O: thoracic & lumbar vertebrae

I: intertubercular groove of humerus

A: extends shoulder (primary mover)

<p>O: thoracic & lumbar vertebrae</p><p>I: intertubercular groove of humerus</p><p>A: extends shoulder (primary mover)</p>