Muscles - Lab Exam 3

Question 1

Orbicularis Oris

Answer 1

Action: purses lips

Question 2

Zygomaticus Major

Answer 2

Origin: Zygomatic bone
Insertion: Orbicularis oris
Action: Smile

Question 3

Frontalis

Answer 3

Action: Raising Eyebrows

Question 4

Orbicularis Oculi

Answer 4

Action: closes eye

Question 5

Masseter

Answer 5

Origin: zygomatic arch
Insertion: angle of mandible
action: elevate mandible

Question 6

Temporalis

Answer 6

Origin: temporal bone
Insertion: coronoid process of mandible
Action: elevates mandible

Question 7

Sternocleidomastoid

Answer 7

Origin: manubrium, sternal end of clavicle
Insertion: mastoid process
Action: contralateral rotation of the head

Question 8

Anterior Scalene

Answer 8

Action: Elevates 1st rib

Question 9

Middle Scalene

Answer 9

Action: elevates 1st rib

Question 10

Pectoralis major

Answer 10

Origin: sternum
Insertion: deltoid tuberosity
Action: flex and medially rotates shoulder

Question 11

Pectoralis minor

Answer 11

Insertion: coracoid process of scapula
Action: protracts scapula

Question 12

Trapezius

Answer 12

Origin: Spinous process of thoracic spine
Insertion: clavicle, acromion, spine of scapula
Action: elevate, retract, depress scapula

Question 13

Latissimus dorsi

Answer 13

Insertion: intertubercular groove of humerus
Action: adducts arm

Question 14

Erector spinae group

Answer 14

origin: sacrum, spinous process of lumbar vertebrae
Insertion: spinous process T1 - T2
Action: extends spine

Question 15

Deltoid

Answer 15

Origin: acromial end of clavicle, acromion and spine of scapula
Insertion: deltoid tuberosity
Action: flex, extend, abduct arm

Question 16

Supraspinatus

Answer 16

Origin: Supraspinous fossa

insertion: greater tubercle of humerus

Action: abducts arm

Question 17

Infraspinatus

Answer 17

Origin: infraspinous fossa

Insertion: greater tubercle of humerus

Action: lateral rotation of arm

Question 18

Teres minor

Answer 18

Origin: lateral border

Insertion: greater tubercle of humerus

Action: external rotation of arm

Question 19

Teres major

Answer 19

origin: lateral border of scapula

Insertion: intertubercular groove of humerus

Action: extend, adduct, internal rotation of arm

Question 20

Subscapularis

Answer 20

Origin: subscapular fossa

Insertion: lesser tubercle of humerus

Action: internal rotation, adduction of arm

Question 21

Biceps Brachii

Answer 21

Origin: coracoid process of scapula

Insertion: radial tuberosity

Action: supination of forearm

Question 22

Brachialis

Answer 22

Origin: distal humerus

Insertion: coronoid process of ulna

Action: elbow flexion

Question 23

Triceps Brachii

Answer 23

Origin: posterior humerus

Insertion: olecranon process of humerus

Action: elbow extension

Question 24

Forearm flexors

anterior group of muscles

Answer 24

Origin: medial epicondyle of the humerus

Insertion: lateral radius, carpals

Action: pronation of forearm, abduction of hand, flexes wrist

Question 25

Forearms extensor | posterior group of muscles

Answer 25

Origin: lateral epicondyle of humerus Insertion: metacarpals, carpals Action: abduct and extends hand

Question 26

Rectus abdominis

Answer 26

Origin: crest of pubis Action: flexes abdomen

Question 27

External oblique

Answer 27

Origin: ribs 5 - 12 Insertion: linea alba, inguinal ligament Action: laterally compresses abdomen

Question 28

Quadratus lumborum

Answer 28

origin: posterior border of iliac crest insertion: rib 12, transverse process of lumbar vertebrae 1 - 4 Action: extension of spine

Question 29

Psoas major

Answer 29

Insertion: lesser trochanter of femur Action: flexion of the hip

Question 30

Iliacus

Answer 30

Origin: iliac fossa Insertion: lesser trochanter of femur Action: flexes and medially rotates hip

Question 31

Tensor fasciae latae

Answer 31

Origin: anterior superior iliac spine Insertion: lateral knee, via iliotibial tract/band Action: hip abduction, medial rotation

Question 32

Gluteus maximus

Answer 32

Origin: posterior ilium Insertion: gluteal tuberosity of femur Action: extends hip and thigh

Question 33

Piriformis

Answer 33

Origin: Sacrum Insertion: greater trochanter Action: lateral rotation of thigh

Question 34

Biceps femoris

Answer 34

Origin: ischial tuberosity and linea aspera Insertion: proximal fibula Action: flex knee

Question 35

Semitendinosus

Answer 35

Origin: ischial tuberosity Insertion: proximal tibia Action: flex knee

Question 36

Semimembranosus

Answer 36

Origin: ischial tuberosity Insertion: medial tibia Action: flex knee

Question 37

Rectus femoris

Answer 37

Origin: Anterior inferior iliac spine Insertion: patella Action: extend knee

Question 38

Vastus lateralis

Answer 38

Origin: Greater trochanter, linea aspera Insertion: patella Action: extend knee

Question 39

Vastus medialis

Answer 39

Origin: linea aspera Insertion: patella Action: extend knee

Question 40

Vastus interemedius

Answer 40

Origin: anterior femur Insertion: patella Action: extend knee

Question 41

Sartorius

Answer 41

Origin: Anterior superior iliac spine Insertion: medial tibia Action: flex, lateral rotation of thigh

Question 42

Adductor Magnus

Answer 42

Origin: inferior ramus of pubis, ischial tuberosity Insertion: linea aspera Action: adduct thigh

Question 43

Gastrocnemius

Answer 43

Origin: medial and lateral epicondyle of femur Insertion: calcaneus Action: Plantar flex foot

Question 44

Soleus

Answer 44

Origin: Posterior tibia and fibula Insertion: Calcaneus Action: Plantar flex foot

Question 45

Tibialis posterior

Answer 45

Origin: posterior tibia and fibula Insertion: metatarsals 2-5, calcaneus Action: inversion of foot

Question 46

Fibularis longus

Answer 46

Origin: shaft of fibula Insertion: metatarsal 1 Action: eversion of foot

Question 47

Tibialis anterior

Answer 47

Origin: anterior tibia Insertion: metatarsal 1 Action: dorsiflexion of foot

Question 48

Flexor digitorum brevis

Answer 48

Origin: calcaneus. via plantar aponeurosis Insertion: middle phalanx of digits 2 - 5 Action: flexes digits 2 - 5