5/26 posterior cervicle tri muscle

Question 1

sternocleidomastoid

Answer 1

SA

• lateral surface of mastoid process
• lateral half of superior nuchal line

IA
sternal head
-anterior surface of manubriun of sternum
clavicular head
-superor surface of medial third clavicle

I
-CN11, C2C3

A
unilaterally
-tilt head on same side but rotate to opposite side
-bend at ao joint
bilaterally 
-extend neck at atlantooccioital joints*
-flexes cervicle neck and at atlantooccioital joint
-foward head poature 
-pump handle deep respiration

Question 2

scalene anterior

Answer 2

O
-anterior tubercle of transverse C3-C6

I
-Scalene tubercle and cranial crest of first rib

I
-ar c3-c8

A

• bend unilaterally
• flex neck bilaterally

Question 3

scalene medius

Answer 3

O
-pos tubercle TP C2-C7

I
-cranial surface of first rib

I
-ar C3-C8

A
same as anterior

Question 4

scalene posterior

Answer 4

O
-tendons from pos tubercles of TP C4-C6

I
-outer surface of 2nd rib

N
-ar C3-C8

A
-same as ant

Question 5

platysma

Answer 5

SA
-inf border of mandible, skin, and subcutaneous tissue of lower face

IA
-Fascia covering sup of pectoralis major and deltoid muscles

I
-certicle branch of facial nerve CN7

A

• draws corners of mouth infly and widens it
• draw skin of neck sup when teeth are clenched