10-2. Principle Muscles and their Actions Flashcards Preview

A&P 1 - Unit 3 > 10-2. Principle Muscles and their Actions > Flashcards

Flashcards in 10-2. Principle Muscles and their Actions Deck (26)
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1
Q

frontalis

A

draws scalp forward, raises eyebrows, wrinkles forehead

2
Q

occiptalis

A

draws scalp backward

3
Q

orbicularis oculi

A

closes the eye (blinking, squinting)

4
Q

orbicularis oris

A

moves the lips (kiss)

5
Q

masseter

A

elevates the mandible, closes the jaw (chew)

6
Q

temporalis

A

elevates the mandible, maintains position of jaw at rest

7
Q

sternocleidomastoid

A

contraction of one rotates face from side to side; contraction of both causes head flexion

8
Q

rectus abdominus

A

compresses abdomen to aid in defecation, urination, childbirth, and forceful exhalation (“sit ups” muscle)

9
Q

external oblique

A

contraction of both compresses abdomen; contraction of one bends the body laterally

10
Q

pectoralis major

A

prime mover of arm flexion, also adducts and rotates arm medially. Used to climb, throw and push

11
Q

latissimus dorsi

A

prime mover of arm extension, also adducts and rotates arm. Used to strike a blow, hammer, swim, or row

12
Q

What is an example of a pair of antagonists in the trunk?

A

pectoralis major and latissimus dorsi

13
Q

biceps brachii

A

flexes elbow joint and supinates forearm

14
Q

triceps brachii

A

extends forearm at elbow

15
Q

What is an example of a pair of antagonists in the arm>

A

biceps brachii and triceps brachii

16
Q

gluteus maximus

A

extends the thigh (as in climbing stairs), also rotates thigh laterally

17
Q

tensor fasciae latae

A

flexes and abducts thigh

18
Q

quadriceps femoris

A

powerful knee extensor used in climbing, running and jumping

19
Q

What muscles make up quadriceps femoris?

A

rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius

20
Q

hamstrings

A

flex knee and extend thigh

21
Q

What muscles make up the hamstrings?

A

biceps femoris, semitendinosus, semimembranosus

22
Q

tibialis anterior

A

prime mover of dorsiflexion

23
Q

gastricnemius

A

plantar flexes foot

24
Q

sartorius

A

flexes thigh and rotates it laterally (cross your legs)

25
Q

What are some examples of antagonists in the leg?

A

quadriceps femoris and hamstrings

tibialis anterior and gastricnemius

26
Q

Achilles tendon

A

thick, very apparent tendon that attaches the gastricnemius muscle to the calcaneius