Gross Anatomy of the Muscular System

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created 7 years ago by chaneasegarvey
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1

Prime Movers/Agonists

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-muscles responsible for producing a particular movement

2

Anatagonists

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muscles that oppose or reverse a movement

3

Synergists

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-aid sthe action of agonists either by assisting with the same movement or by reducing undesirable or unnecessary movement

4

Fixators

-immobilize the origin of a prime mover so that all the tension is exerted at the insertion
-specialized synergists

5

Rectus

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-any straight muscle

6

Transverse

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- at right angles to the axis

7

Oblique

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- in a slanted position

8

Maximus

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largest

9

Minimus

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smallest

10

Longus

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long

11

Brevis

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short

12

Deltoid

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triangular

13

Orbicularis Oculi

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-muscle of eyelids
ORIGIN: frontal and maxillary bones and ligaments around orbit
INSERTION: encircles orbit and inserts in tissue of the eyelid
ACTION: closes eyes, blinking, squinting

14

Zygomaticus (major and minor)

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-extends diagonally from the corner of mouth to cheekbone
ORIGIN: zygomatic bone
INSERTION: skin and muscle at corner of mouth
ACTION: raises lateral corners of mouth upward (smiling muscle)

15

Orbicularis Oris

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-multilayered muscle of lips with fibers that run in many different directions

16

Buccinator

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-principal muscle of cheek; runs horizontally deep into the masseter