Exam 2 Muscle Actions - Cumulative

Question 1

pec major actions

Answer 1

ADduction of arm, medial rotation, flexion of arm (clavicular), extension of flexed humerus (sternocostal part)

Question 2

pec minor action

Answer 2

stabilizes scapula

Question 3

serratus anterior action

Answer 3

scapular protraction, holds scapula against thoracic wall (get winging of scap when thoracic nerve is damaged)

Question 4

subclavius action

Answer 4

depression of scap, stabilizes sternoclavicular joint

Question 5

external intercostals actions

Answer 5

aids in inhalation, lifts ribs up and out

Question 6

internal intercostals action

Answer 6

aids in forced expiration, pulls ribs in and down

Question 7

innermost intercostals action

Answer 7

aids in forced expiration, pulls ribs in and down

Question 8

subcostals action

Answer 8

aids in expiration, pulls ribs back down

Question 9

transversus thoracis action

Answer 9

retracts sternum to aid in expiration

Question 10

forced expiration (muscles)

Answer 10

internal and innermost intercostals, abdominal muscles, subcostals, transversus thoracis, serratus posterior inferior

Question 11

forced inspiration (muscles)

Answer 11

sternocleidomastoid, scalenes, serratus posterior, pec major/minor

Question 12

external oblique action

Answer 12

bilateral forward and ipsilateral flexion, contralateral rotation, compresses and supports abdominal viscera

Question 13

internal oblique actions

Answer 13

ipsilateral flexion, ipsilateral rotation, bilateral forward flexion, compresses and supports abdominal viscera

Question 14

transversus abdominus action

Answer 14

compression of abdominal viscera

Question 15

rectus abdominus action

Answer 15

bilateral forward flexion, pelvic tilt, compression of abdominal viscera