Actions

Question 1

What is the action of rectus abdominus

Answer 1

Flex the trunk
Compress the abdomen
Stabilize the pelvis

Question 2

What is the action of transversus abdominus

Answer 2

Uni: ipsilateral rotation
Bi: compress the abdomen

Question 3

What is the action of external oblique

Answer 3

Uni: ipsilateral lateral flexion, contralateral rotation
Bi: flex the trunk, compress the abdomen, stabilize the pelvis

Question 4

What is the action of the internal oblique

Answer 4

Uni: ipsilateral lateral flexion, contralateral rotation
Bi: flex the trunk, compress the abdomen, stabilize the pelvis

Question 5

What is the action of diaphragm

Answer 5

Respiration

Question 6

What is the action of psoas major

Answer 6

Hip joint: flexion and external rotation

Lumbar spine: return spine to upright position

Question 7

What is the action of psoas minor

Answer 7

Weak flexor of the trunk

Question 8

What is the action of ilacus

Answer 8

Works with psoas major

Flexes thigh, stabilizes hip joint

Question 9

What is the action of quadratus lumborum

Answer 9

Uni: ipsilateral lateral flexion
Bi: stabilizes 12th rib

Question 10

What is the action of intercostals

Answer 10

External: inspiration (raises ribs)

Internal and innermost: expiration (lowers ribs)

Question 11

What is the action of transversus thoracis

Answer 11

Weakly lowers ribs ( expiration)

Question 12

What is the action of diaphragm hiatus and crura

Answer 12

Respiration

Question 13

What is the action of levator ani

Answer 13

Support pelvic viscera

Question 14

What is the action of coccygeus

Answer 14

Support pelvic viscera

Flex coccyx

Question 15

What is the action of piriformis

Answer 15

External rotation
ABduction
Stabilizes flexed hip

Question 16

What is the action of Obturator internus

Answer 16

External rotation

ABduction of flexed hip

Question 17

What is the action of ishiocavernosus

Answer 17

Maintains an erection by squeezing blood into clitoris or penis corpus caverunosum

Question 18

What is the action of bulbospongiosus

Answer 18

Females: compress vestibular gland
Male: maintain erection

Question 19

What is the action of superficial transverse perineal

Answer 19

Helps pelvic organs

Closes urethra

Question 20

What is the action of external anal spinchter

Answer 20

Closes anus

Question 21

What is the action of omohyoid, sternohyoid,sternothyroid

Answer 21

Depresses the hyoid and larynx for phonation and swallowing

Question 22

What is the action of thyrohyoid

Answer 22

Depress hyoid, elevate larynx for swallowing

Question 23

What is the action of masseter

Answer 23

Elevates and protrudes mandible

Question 24

What is the action of temporalis

Answer 24

Elevates, retracts, laterally deviates mandible

Question 25

What is the action of lateral pterygoid

Answer 25

Bi laterally: protrudes mandible | Unilateral: lateral deviation

Question 26

What is the action of medial pterygoid

Answer 26

Elevates mandible | Works with lateral pterygoid for ipsilateral lateral deviation

Question 27

What is the action of platysma

Answer 27

Forced depression of mandible | Tenses skin on neck

Question 28

What is the action of digastric

Answer 28

Elevates the mandible for swallowing

Question 29

What is the action of Stylohyoid

Answer 29

Elevates the mandible for swallowing

Question 30

What is the action of mylohyoid

Answer 30

Depress the mandible Draws hyoid forward for swallowing Lateral deviation for chewing

Question 31

What is the action of geniohyoid

Answer 31

Depress mandible | Draws hyoid forward for swallowing