Lab 6

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created 7 years ago by anoffke
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Muscle Tissue, Head and Neck Muscles
updated 7 years ago by anoffke
Subjects:
human anatomy
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1

Smooth muscle

no striations, involuntary

2

Skeletal muscle

striated, voluntary

3

Cardiac muscle

striated, involuntary, intercalated disks

4

Action of trapezius

elevation, retraction and depression of scapula

5

Action of sternocleidomastoid

rotate and flex head to opposite side of contracting muslce

6

Action of platysma

depress mandible, tenses skin of neck, depress lower lip back and down

7

Action of levator scapulae

elevation and rotation of scapula

8

Action of splenius capitis

extends, rotates and flexes laterally the head

9

Action of occipitofrontalis

elevates eyebrows, wrinkles skin of forehead, draws scalp anteriorly (surprise)

10

Action of buccinator

compresses (pulls inward) cheeks (as in whistling and kissing)

11

Action of depressor labii inferioris

depresses lower lip (frowning or doubt)

12

Action of levator labii superioris

elevates upper lip (sneering)

13

Action of orbicularis oculi

closes eye by depressing upper eyelid and elevating lower eyelid

14

Action of orbicularis oris

compresses lips, protrudes and purses lips (kissing)

15

Action of zygomaticus

retracts and elevates upper lip and corner of mouth (smiling)

16

Action of temporalis

elevates and retracts mandible for biting and chewing

17

Action of masseter

elevates and protracts mandible

18

Origin and insertion of sternocleidomastoid

origin: manubrium and clavicle

insertion: mastoid process and superior nuchal line of occipital bone

19

Origin and insertion of temporalis

origin: temporal lines on parietal and frontal bones

insertion: coronoid process of mandible

20

Origin and insertion of masseter

origin: zygomatic arch

insertion: lateral side of mandible

21

Origin and insertion of digastric muscles

origin: mastoid process (posterior belly), mandible near midline (anterior belly)

insertion: hyoid