Lab Exam 3 - Skeletal Muscles and Their Actions (Exercise 14) Flashcards Preview

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Flashcards in Lab Exam 3 - Skeletal Muscles and Their Actions (Exercise 14) Deck (168)
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1

Define Term: Origin

Point of attachment of the muscle tendon to the stationary bone (the bone which does not move with muscle contraction)

2

Define Term: Insertion

Point of attachment of the muscle tendon to the bone that moves with muscle contraction

3

Define Term: Action

The body movement that results from contraction of the muscle. During contraction, the insertion always moves toward the origin.

4

Define Term: Tendon

Tendons attach muscle to bone. They are extensions of the connective tissues surrounding the muscles, usually in long, parallel bundles. If the tendon is broad and flat, it is called an aponeurosis.

5

Understand the meaning of the folllowing terms with respect to muscle action: Flexor

A muscle that when contracted acts to bend a joint or limb in the body.

6

Understand the meaning of the folllowing terms with respect to muscle action: Extensor

A muscle that extends or straightens a limb or body part.

7

Understand the meaning of the folllowing terms with respect to muscle action: Abductor

A muscle that draws a body part, such as a finger, arm, or toe, away from the midline of the body or of an extremity.

8

Understand the meaning of the folllowing terms with respect to muscle action: Adductor

A muscle that draws a body part, such as a finger, arm, or toe, inward toward the median axis of the body or of an extremity.

9

Understand the meaning of the folllowing terms with respect to muscle action: Levator

A muscle that raises a bodily part.

10

Understand the meaning of the folllowing terms with respect to muscle action: Depressor

Any of various muscles that serve to draw down a part of the body.

11

Understand the meaning of the folllowing terms with respect to muscle action: Supinator

A muscle, especially in the forearm, that effects or assists supination.

12

Understand the meaning of the folllowing terms with respect to muscle action: Pronator

A muscle that effects or assists in pronation.

13

Understand the meaning of the folllowing terms with respect to muscle action: Sphincter

a ringlike muscle which closes a natural orifice or passage.

14

Understand the meaning of the folllowing terms with respect to muscle action: Tensor

A muscle that stretches or tightens a body part.

15

Understand the meaning of the folllowing terms with respect to muscle action: Rotator

A muscle that serves to rotate a part of the body.

16

Name the Origin, Insertion, and Action. Muscles of the Facial Expression: Frontalis

Origin: Epicranial Aponeurosis Insertion: Skin superior to superior to supraorbital margin Action: Raises eyebrows & wrinkles forehead

17

Name the Origin, Insertion, and Action. Muscles of the Facial Expression: Occipitalis

Origin: Occipital bone and mastoid process of the temporal bone Insertion: Epicranial Aponeurosis Action: Pulls scalp posteriorly

18

Name the Origin, Insertion, and Action. Muscles of the Facial Expression: Orbicularis oculi

Origin: Medial wall of orbit Insertion: Skin around margin of orbit Action: Closes Eye

19

Name the Origin, Insertion, and Action. Muscles of the Facial Expression: Zygomaticus Minor

Origin: Zygomatic Bone Insertion: Upper Lip Action: Raises upper lip, exposes upper teeth

20

Name the Origin, Insertion, and Action. Muscles of the Facial Expression: Zygomaticus Major

Origin: Zygomatic Bone Insertion: Skin and angle of mouth and orbicularis oris Action: Raises corner of mouth (smiling)

21

Name the Origin, Insertion, and Action. Muscles of the Facial Expression: Orbicularis Oris

Origin: muscle fibers surrounding mouth Insertion: Skin at the corner of mouth Action: Closes and purses lips

22

Name the Origin, Insertion, and Action. Muscles of the Facial Expression: Platysma

Origin: Fascia covering deltoid and pectoralis major Insertion: Mandible, Muscles around angle of mouth, and skin of lower face Action: Tenses neck skin, depresses mandible (pouting)

23

Name the Origin, Insertion, and Action. Muscles of the Mastication: Temporalis

Origin: Temporal Bone Insertion: Coronoid process and ramus of mandible Action: Elevates and retracts mandible

24

Name the Origin, Insertion, and Action. Muscles of the Mastication: Masseter

Origin: Maxilla and zygomatic arch Insertion: Ramus and angle of mandible Action: Elevates and retracts mandible

25

Name the Origin, Insertion, and Action. Muscles that move the Head and Neck: Sternocleidomastoid

Origin: Sternum and clavicle Insertion: Mastoid process of temporal bone Action: Bilateral contraction flexes head. Unilateral contraction laterally flexes head and rotates it to the opposite side

26

Name the Origin, Insertion, and Action. Muscles that move the Head and Neck: Splenius Capitus

Origin: Ligamentum nuchae and spinous proess of vertebrae C7-T12 Insertion: Clavical, Acromion of Scapula, and Spine of Scapula Action: Extends Head and Elevates Scapula

27

Name the Origin, Insertion, and Action. Muscles that move the Head and Neck: Trapezius

Origin: Occipital bone and spines of C7 through T12 Insertion: Clavical and Scapula Action: superior fibers elevate scapulae, middle fibers adduct scapulae, inferior fibers depress scapulae

28

Name the Origin, Insertion, and Action. Muscle that only moves the scapula: Levator Scapulae

Origin: Vertebrae C1-C5 Insertion: Superior Vertebra and Border of Scapula Action: Elevates Scapula and Rotates it Downward, Stabilizes Scapula

29

Selected Muscles of the Head. Define 1.

1. Orbicularis oculi

30

Selected Muscles of the Head. Define 2.

2. Orbicularis oris