Muscles

Question 1

Nerve supply of the facial muscles

Answer 1

facial nerve CN VII

Question 2

Occipitofrontalis action

Answer 2

elevates eyebrows
wrinkles skin on forehead
retracts scalp

Question 3

Orbicularis oculi

Answer 3

closes eyelids
palpebral part - gently
orbital part - tight winking

Question 4

buccinator action

Answer 4

presses cheek against molar teeth
resists distension of cheeks when blowing

Question 5

orbicularis oris action

Answer 5

holds lips closed
compresses and protrudes lips

Question 6

platysma action

Answer 6

depresses mandible
tenses skin of inferior face and neck

Question 7

What are the muscles of mastication?

Answer 7

temporalis
masseter
lateral pterygoid
medial pterygoid

Question 8

PA of temporalis

Answer 8

Floor of temporal fossa, up to the inferior temporal line
Deep surface temporal fascia

Question 9

DA of temporalis

Answer 9

Coronoid process of the mandible
Anterior ramus

Question 10

What nerve supplies the muscles of mastication

Answer 10

mandibular division of the trigeminal nerve

Question 11

action of the temporalis

Answer 11

elevates mandible (closes jaw)
posterior fibre retracts the mandible

Question 12

PA of the masseter

Answer 12

zygomatic bone and zygomatic arch

Question 13

DA of masseter

Answer 13

Angle and lateral side of ramus of the mandible

Question 14

action of masseter

Answer 14

elevates mandible
assists in protrusion

Question 15

PA of lateral pterygoid

Answer 15

greater wing of the sphenoid
lateral surface of lateral pterygoid plate

(two heads)

Question 16

DA of lateral pterygoid

Answer 16

neck of mandible and articular disc

Question 17

action of lateral pterygoid

Answer 17

bilaterally protrudes mandible
depresses chin
unilaterally moves jaw to the contralateral side

Question 18

PA of medial pterygoid

Answer 18

medial surface of lateral pterygoid plate
palatine and maxillary bone
(2 heads)

Question 19

DA of medial pterygoid

Answer 19

medial surface of the mandibular ramus

Question 20

action of medial pterygoid

Answer 20

elevates mandible and assists in protrusion
unilaterally produces grinding movements

Question 21

DA of SCM

Answer 21

mastoid process of the temporal bone

Question 22

PA of SCM

Answer 22

Sternal head - manubrium of the sternum
Clavicular head - medial 1/3 of the clavicle

Question 23

NS of SCM

Answer 23

accessory nerve CN XI (motor
spinal nerves

Question 24

action of SCM

Answer 24

bilaterally - anterior translation of the head
unilaterally - ipsilateral side bending, contralateral rotation

Question 25

PA of trapezius

Answer 25

medial 1/3 of superior nuchal ligament external occipital protuberance nuchal ligament SPs of C7-T12

Question 26

DA of trapezius

Answer 26

lateral 1/3 of clavicle acromion spine of the scapula

Question 27

NS of trapezius

Answer 27

accessory nerve CN XI C3/4 spinal nerves

Question 28

Action of trapezius

Answer 28

Superior * Elevates scapula Middle * Retracts scapula Inferior * Depresses scapula Superior and inferior: rotate glenoid fossa superiorly

Question 29

suprahyoid muscles

Answer 29

Mylohyoid geniohyoid stylohyoid diagastric

Question 30

infrahyoid muscles

Answer 30

sternohyoid omohyoid sternothyroid thyrohyoid

Question 31

prevertebral/anterior muscles

Answer 31

longus colli longus capitis rectus capitis anterior anterior scalene

Question 32

lateral cervical muscles

Answer 32

rectus capitis lateralis splenius capitis middle scalene posterior scalene levator scapulae

Question 33

PA of middle scalene

Answer 33

posterior tubercles of TPs of C5-7

Question 34

DA of middle scalene

Answer 34

1st rib, posterior to subclavian groove

Question 35

the action of the middle scalene

Answer 35

side bending of the neck elevation of 1st rib during forced inspiration

Question 36

PA of posterior scalene

Answer 36

posterior tubercles of TPs of C5-7

Question 37

DA of posterior scalene

Answer 37

external border of 2nd rib

Question 38

the action of posterior scalene

Answer 38

side bending of the neck elevation of the 2nd rib during forced inspiration

Question 39

PA of levator scapulae

Answer 39

posterior tubercle of TPs C1-4 vertebrae

Question 40

DA of levator scapulae

Answer 40

medial border of the scapula, superior to the spine of the scapula

Question 41

action of levator scapulae

Answer 41

elevates scapula and downwardly rotates it

Question 42

suboccipital muscles

Answer 42

rectus capitis posterior major rectus capitis posterior minor obliquus capitis inferior obliquus capitis superior

Question 43

what are the superficial extrinsic muscles

Answer 43

Trapezius Latissimus dorsi Levator scapulae Rhomboids

Question 44

what are the intermediate extrinsic muscles

Answer 44

serratus posterior superior serratus posterior inferior

Question 45

what are the superficial intrinsic muscles

Answer 45

splenius capitis spenius cervicis

Question 46

what are the intermediate intrinsic muscles

Answer 46

iliocostalis longissimus spinalis

Question 47

which group of back muscles are the erector spinae muscles?

Answer 47

intermediate intrinsic

Question 48

what are the deep intrinsic muscles?

Answer 48

rotatores multifidus semispinalis

Question 49

what are the deep intrinsic muscles also called

Answer 49

transversospinalis muscles

Question 50

what are the deep minor intrinsic muscles

Answer 50

interspinalis intertransversarii levatores costarum