lab 9 - muscles of the trunk, head, and neck

Question 1

pectoralis major

Answer 1

flexes, adducts, and medially rotates arm
O - clavicle, sternum, cartilages of ribs 1-7
I - crest of greater tubercle of humerus

Question 2

pectoralis minor

Answer 2

depresses glenoid cavity

Question 3

trapezius

Answer 3

extends and abducts head, rotates and adducts scapula
O - posterior occipital bone C7-T12
I - clavicle, acromion, and spine of scapula

Question 4

deltoid

Answer 4

abducts arm, flexes, extends, medially and laterally rotates arm
O - clavicle, acromion, spine of scapula
I - deltoid tuberosity of the humerus

Question 5

latissimus dorsi

Answer 5

extends, adducts, and medially rotates arm, draws shoulder inferiorly

Question 6

supraspinatus

Answer 6

abducts arm, helps stabilize shoulder joint
O - supraspinous fossa
I - greater tubercle of humerus

Question 7

subscapularis

Answer 7

medially rotates arm, stabalizes shoulder joint
O - subscapular fossa
I - lesser tubercle of humerus

Question 8

infraspinatus

Answer 8

laterally rotate arm, stabilizes shoulder joint
O - infraspinous fossa
I - greater tubercule of humerus

Question 9

teres minor

Answer 9

laterally rotates and adducts arm, stabilizes shoulder joint

Question 10

teres major

Answer 10

extends and medially rotates arm

Question 11

external abdominal oblique

Answer 11

compresses abdominal wall, laterally rotates waist

Question 12

internal abdominal oblique

Answer 12

compresses abdominal wall, laterally rotates waist

Question 13

rectus abdominis

Answer 13

flexes vertebral column, compresses abdominal wall

Question 14

external intercostals

Answer 14

elevates ribs (increases volume in thoracic cavity)

Question 15

internal intercostals

Answer 15

depresses ribs (decreases volume in thoracic cavity)

Question 16

serratus anterior

Answer 16

abducts scapula (moves scapula away from spinal column)

Question 17

diaphragm

Answer 17

inspiration (increases volume of thoracic cavity)

Question 18

occipitiofrontalis (frontal belly)

Answer 18

raises eyebrows, draws scalp anteriorly

Question 19

occipitofrontalis (occipital belly)

Answer 19

draws scalp posteriorly

Question 20

temporalis

Answer 20

elevates (closes) mandible

Question 21

masseter

Answer 21

elevates (closes) mandible

Question 22

orbicularis oculi

Answer 22

closes eyelid

Question 23

orbicularis oris

Answer 23

closes lips

Question 24

nasalis

Answer 24

compresses bridge of nose, flares nostrils

Question 25

zygomaticus major

Answer 25

elevates corner of mouth (smiling and laughing)

Question 26

zygomaticus minor

Answer 26

elevates cornor of mouth (smiling and laughing)

Question 27

risorius

Answer 27

pulls edge of mouth lateral

Question 28

levatator labii superioris

Answer 28

elevates superior lip

Question 29

depressor labii inferioris

Answer 29

depresses lower lip

Question 30

mentalis

Answer 30

protrudes lower lip

Question 31

buccinator

Answer 31

compresses cheek

Question 32

platysma

Answer 32

depresses (opens) mandible

Question 33

sternocleidomastoid (sternal and clavicular heads)

Answer 33

abducts, rotates, and flexes head

Question 34

sternohyoid

Answer 34

depresses hyoid during swallowing, tongue movement, and speech

Question 35

omohyoid (superior and inferior belly)

Answer 35

depresses hyoid during swallowing, tongue movement, and speech

Question 36

digastric (posterior and anterior belly)

Answer 36

opens mandible during swallowing, tongue movement, and speech

Question 37

stylohyoid

Answer 37

elevates hyoid during swallowing, tongue movement, and speech

Question 38

mylohyoid

Answer 38

elevates hyoid during swallowing, tongue movement, and speech