Muscles (Pt. 2)

Question 1

What is the platysma?

Answer 1

Single sheet-like muscle

Question 2

What does the platysma cover?

Answer 2

Anterolateral neck

Question 3

Where does the platysma originate from?

Answer 3

Originiates from the connective tissue covering of the chest muscles

Question 4

Where does the platysma insert into?

Answer 4

The area around the mouth

Question 5

What is the action of the platysma?

Answer 5

To pull the corners of the mouth inferiorly

Question 6

What does the platysma produce at the mouth?

Answer 6

Produces downward sag of the mouth

Question 7

What happens when both sternocledomastoid muscles contract together?

Answer 7

They flex your neck

Question 8

What does the flex of the neck allow for? (Sternocleidomastoids)

Answer 8

Allows for bowing of the head

Question 9

What are the sternocledomastoid muscles called?

Answer 9

Prayer muscles

Question 10

What is the pectoralis major shaped like? What does it cover? (2)

Answer 10

• Large fan shaped muscle
• Covering upper part of chest

Question 11

Where does the pectoralis major originate from? (2)

Answer 11

• Shoulder girdle
• First 6 ribs

Question 12

Where do the internal intercostal muscles lay? What do the internal intercostal muscles do to help with exhalation? (2)

Answer 12

• Lie deep to the external intercostals
• Depress the rib cage to help with exhalation

Question 13

What are the muscles of the abdominal girdle? (4)

Answer 13

• Rectus abdominis
• External oblique
• Internal oblique
• Transverses abdominis

Question 14

What do the trapezius muscles extend?

Answer 14

Extend the head

Question 15

What are the trapezius muscles to the sternocleidomastoids?

Answer 15

Antagonists

Question 16

What can the trapezius muscles do to the scapula? (3)

Answer 16

• Elevate
• Depress
• Adduct

Question 17

What are latissimus dorsi? What do they cover?

Answer 17

Large flat muscles that cover the lower back

Question 18

What do the latissimus dorsi extend and adduct to?

Answer 18

Extend and adduct the humerus

Question 19

What are latissimus dorsi important when? What actions benefit? (2)

Answer 19

• Important when the arm must be brought down
• As when swimming or sledge hammering

Question 20

What action do the erector spinae group provide resistance and control to?

Answer 20

Provide resistance that controls the action of bending over at the waist

Question 21

What happens when the erector spinae are injured? (2)

Answer 21

• Muscles go into spasms
• Common sourse of lower back pain

Question 22

What are deltoid muscles? What do they form? (3)

Answer 22

• Fleshy
• Triangle-shaped muscles
• Form the rounded shape of shoulders

Question 23

Why are deltoid muscles a good place for injection of small amounts of medication? What amount? (2)

Answer 23

• Because of the bulk size
• Less than 5 mL

Question 24

What are the deltoid the prime movers of?

Answer 24

Prime movers of arm abduction

Question 25

Where does the origin wind across from where to where? (3)

Answer 25

• Origin winds across the shoulder girdle
• From the spine of the scapula
• To the clavicle

Question 26

Where do the deltoids insert into?

Answer 26

Inserts into the proximal humerus