1. The Muscular System Major Movers and Shakers
BIOL 2400 – Anatomy and Physiology 1
Chapter 11

3. Temporalis O: Temporal fossa I: Coronoid process and
O: Temporal fossa
I: Coronoid process and
ramus of the mandible
A: Elevation of the
mandible
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4. Masseter anterior portion of the zygomatic arch I: Angle and the ramus
 O: Maxilla and the
anterior portion of the
zygomatic arch   
I: Angle and the ramus
of the mandible.
A: Elevation of the
mandible
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6. Orbicularis oculi O: Medial wall of the orbit
I: Medial wall of the orbit
A: Closes the eyelid
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7. Orbicularis oris I: The skin at the corners of the mouth
 O: Opening of the mouth   
I: The skin at the corners
of the mouth
A: Closes the mouth
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9. Zygomaticus major O: Zygomatic bone I: The skin at the corners  
I: The skin at the corners
of the mouth and the
orbicularis oris
A: Elevates the skin at
the corners of the
mouth (smiling)
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10. Depressor anguli
oris
O: Anterior 1/3 of the body of the mandible, lateral to the mental foramen   
I: Angle of the mouth
A: Draws the angle of
the mouth laterally
and inferiorly, as in
opening the mouth
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12. Supraspinatus O: The supraspinous fossa of the scapula
I: The greater tubercle of the humerus
A: Weak ABduction of the
shoulder joint
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14. Infraspinatus O: The infraspinous fossa of the scapula
I: The greater tubercle of the humerus
A: Lateral rotation of the
humerus
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16. Teres minor O: Inferior lateral border of the scapula
I: The greater tubercle of the humerus
A: Lateral rotation of the
humerus
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18. Pectoralis minor O: Ribs 3 through 5
I: The coracoid process of the scapula
A: Protraction of the
scapula
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20. Rhomboid major O: The spinous processes of T2 through T5
I: The vertebral border of the scapula, inferior to the spine
A: Retraction of the
scapula
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22. Rhomboid minor O: The spinous processes of C7 through T1
I: The vertebral border of the scapula, superior to the spine
A: Retraction of the
scapula
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24. Levator scapulae O: The transverse processes of C1 through C4
I: The superior angle of the scapula
A: Elevation of the
scapula
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