Muscles (OIA)

Question 1

orbicularis oculi

Answer 1

origin- frontal & maxillary bone
insertion- tissue around eyelid
action- closing eye

Question 2

zygomaticus major

Answer 2

origin- zygomatic bone
insertion- tissue around mouth
action- raise lateral corners of the mouth (smile)

Question 3

splenius capitus

Answer 3

origin- spinous process c7-t6
insertion-temporal & mastoid process
action-head extension, hyperextension

Question 4

trapezius

Answer 4

origin- occipital bone, all thoracic vertebrae starting at c7
insertion- coracoid & acromion processes, lateral 1/3 clavicle
action- shrugging shoulders, elevate scapula, head, clavicle, rotate scapula

Question 5

deltoids

Answer 5

origin-lateral 1/3 clavicle, acromion & spine scapula
insertion-deltoid tuberosity
action-prime mover, abduction

Question 6

brachioradialis

Answer 6

origin- lateral ridge @ distal end of humerus
insertion-base radial styloid process
action-synergist in forearm flexion

Question 7

flexor carpi ulnaris

Answer 7

origin-medial epicondyle of humerus
insertion-base of metacarpal 5, hamate & pisiform
action-flex & adduction of hand

Question 8

extensor capri radialis longus

Answer 8

origin- lateral epicondyle of humerus
insertion-base of metacarpal 2
action- extension, abduction wrist

Question 9

serratus anterior

Answer 9

origin-ribs 1-8
insertion-scapula vertebral border
action-abduction & rotates scapula lateral & superior

Question 10

rhomboideus major

Answer 10

origin-spinous process c7 & t1-t4
insertion-medial border of scapula
action-stabilize scapula

Question 11

diaphragm

Answer 11

origin-lumbar vertebrae costal cartilage ribs 6-12
insertion-central tendon
action-prime mover for respiration

Question 12

pectoralis major

Answer 12

origin- clavicle, sternum, cartilage ribs 1-6
insertion- intertubercular sulcus
action- prime mover flexion, adduction of arm and medial rotation

Question 13

latissimus dorsi

Answer 13

origin-spinous process lower 6 thoracic
insertion- floor of intertubercular sulcus
action-primary extension, adduction, medial rotate arm

Question 14

erector spinae

Answer 14

origin-iliac crest and transverse process of vertebra
insertion- ribs and transverse process of vertebra
action- extend/flex vertebral column

Question 15

rectus abdominus

Answer 15

origin-pubic crest, symphysis
insertion- xiphoid process, costal cartilage 5-7
action-flexion lumbar/spine, compress abdominal region

Question 16

sartorius

Answer 16

origin-anterior superior iliac spine
insertion-aponeurosis on medial proximal tibia
action-flexes, abducts, laterally rotates thigh
flexes leg

Question 17

adductor longus

Answer 17

origin-pubis bone near symphysis
insertion- linea aspera on femur
action-adduct, flex and medially rotate thigh

Question 18

rectus femoris (quadriceps)

Answer 18

origin-anterior inferior iliac of spine
insertion-tibial tuberosity/ patella
action-extends leg and flexes thigh

Question 19

biceps femoris (hamstrings)

Answer 19

origin-ischial tuberosity
insertion-head of fibula, lateral condyle of tibia
action-extends thigh and flexes leg

Question 20

gastrocnemius

Answer 20

origin-medial and lateral condyles of femur
insertion-calcaneous
action- plantar flexion of foot