muscles origin insertion action

Question 1

digastric

Answer 1

mandible and posterior mastoid region of temporal bone
hyoid, depresses mandible and elevates larynx

Question 2

geniohyoid

Answer 2

medial surface of mandible at chin
hyoid, depresses mandible, elevates larynx, pulls hyoid anteriorly

Question 3

mylohyoid

Answer 3

mylohyoid line of mandible
raphe connected to hyoid, elevates floor of mouth, depresses mandible

Question 4

sternohyoid

Answer 4

clavicle and manubrium
hyoid, depresses hyoid and larynx

Question 5

sternocleidomastoid

Answer 5

head attaches to sternal end of clavicle, sternal head attaches to manubrium
mastoid region of skull, lateral part of nuchal line
flex the neck and head toward shoulder movement

Question 6

diaphragm

Answer 6

xiphoid process, cartilage in ribs 4-10
central tendinous sheet, expands thoracic cavity and compresses abdominopelvic cavity

Question 7

rectus abdominus

Answer 7

pubis surface around symphysis
inferior surface of ribs 5-7 & xiphoid process
depresses ribs, flexes vertebral column, compresses abdomen

Question 8

trapezius

Answer 8

occipital bone and spinous process of thoracic vertebrae
clavicle & scapula, elevate, retract, depress or rotate scapula upward or extend neck

Question 9

deltoid

Answer 9

clavicle and scapula
deltoid tuberosity of humerus, abduction at shoulder, medial & lateral rotation

Question 10

supraspinatus

Answer 10

supraspinous fossa of scapula
greater tubercle of humerus, abduction at shoulder

Question 11

subscapularis

Answer 11

subscapular fossa of scapula
lesser tubercle of humerus, medial rotation at shoulder

Question 12

teres major

Answer 12

inferior angle of scapula
reaches medial lip of intertubercular groove of humerus, extension adduction and medial rotation at shoulder

Question 13

pectoralis major

Answer 13

sternum, ribs 2-6 and inferior, medial portion of clavicle
crest of greater tubercle and intertubercular groove of humerus
flexion, adduction and medial rotation at shoulder

Question 14

infraspinatus

Answer 14

infraspinous fossa of scapula, greater tubercle of humerus
lateral rotation at shoulder

Question 15

teres minor

Answer 15

lateral border of scapula, reaches greater tubercle of humerus when passing laterally
lateral rotation at shoulder

Question 16

latissimus dorsi

Answer 16

spinous process of thoracic and lumbar vertebrae, ribs 8-12
floor of intertubercular groove of humerus
extension, adduction and medial rotation at shoulder

Question 17

biceps brachii

Answer 17

coracoid process and supraglenoid tubercle of scapula
tuberosity of radius, flexion and supination at elbow and shoulder

Question 18

brachialis

Answer 18

distal humerus surface
tuberosity of ulna, flexion at elbow

Question 19

brachioradialis

Answer 19

lateral epicondyle of humerus, styloid process of radius
flexion at elbow

Question 20

triceps brachii

Answer 20

lateral margin of humerus, olecranon of ulna, extension at elbow

Question 21

adductor brevis
adductor longus

Answer 21

inferior ramus of pubis, linea aspera of femur, adduction, flexion and medial hip rotation

Question 22

adductor magnus

Answer 22

inferior ramus of pubis posterior to ischial tuberosity and adductor brevis, linea aspera and adductor tubercle of femur, adduction at hip, flexion and medial rotation and extension and lateral rotation

Question 23

pectineus

Answer 23

superior ramus of pubis, pectineal line inferior to lesser trochanter
flexion at knee and adduction and medial hip rotation

Question 24

gracilis

Answer 24

inferior ramus of pubis
medial tibia surface
flexion at knee and adduction and medial hip rotation

Question 25

biceps femoris

Answer 25

ischial tuberosity, femur linea aspera head of fibula, tibia lateral condyle, flexion at knee and extension at lateral rotation at hip

Question 26

semimembranosus

Answer 26

ischial tuberosity, medial condyle fo tibia (posterior), flexion at knee, extension and medial hip rotation

Question 27

semitendinosus

Answer 27

ischial tuberosity, medial tibia surface near gracilis insertion flexion at knee, extension and medial hip rotation

Question 28

sartorius

Answer 28

anterior superior iliac spine, medial surface of tibia near tibial tuberosity flexion at knee, flexion and lateral hip rotation

Question 29

rectus femoris

Answer 29

iliac spine and superior acetabular rim of ilium, tibial tuberosity of patella ligament extension at knee, flexion at hip

Question 30

vastus intermedius

Answer 30

anterolateral surface of femur and linea aspera tibial tuberosity of patella ligament, extension at knee

Question 31

vastus lateralis

Answer 31

greater trochanter of femur, tibial tuberosity of patella, extension at knee

Question 32

vastus medialis

Answer 32

linea aspera of femur, tibial tuberosity of patella, extension at knee

Question 33

gastrocnemius

Answer 33

femoral condyles calcaneus by calcaneal tendon plantar flexion and inversion of foot, knee flexion

Question 34

soleus

Answer 34

head of fibula, shaft of tibia calcaneus by calcaneal tendon extension at ankle