Lec 20 Ant. NK MM.

Question 1

Sternocleidomastoid

Answer 1

Origin-
1. Sternal head : ant. surface manubrium
2. Clavicular head :
Medial 1/3 of clavicle
(sup Surface)
Insertion-
1. Mastoid process
2. Lat. 1/3 Sup. Nuchal line
Action- Flex, IP Lat. Flex, Rot. Op side CS, Ext head- (cap ext)
elevates sternum and the clavicle - forced expiration

Question 2

Mylohyoid

Answer 2

Origin-
mylohyoid line of mandible
Insertion-
1.Body of hyoid
2. Median Raphe
Action-
elevates hyoid bone + floor of mouth (swallowing)
depresses mandible

Question 3

Digastric

Answer 3

Ant. Belly-
digastric fossa
Post. belly-
mastoid process
Insert-
body of hyoid bone
Action -
elevates hyoid
depresses mandible

Question 4

Geniohyoid

Answer 4

O- Inf. mental spine
I- body of hyoid
A- elevates hyoid bone + depresses mandible

Question 5

Stylohyoid

Answer 5

O- styloid process
I- body of hyoid + base of lesser horn of hyoid
A- elevate + retract hyoid
(no action mandible)

Question 6

thyrohyoid

Answer 6

O- oblique line thyroid cartilage
(Sup. Medial Fiber direc.)
I- lower border hyoid bone
A - elevate thyroid cartilage
(larynx) + depresses hyoid

Question 7

Omohyoid

Answer 7

O- upper border Scapula
+ Suprascalpular Lig. (attached to clav. + 1st rib by sling
I - lower lateral border of hyoid
A- depresses hyoid

Question 8

Sternohyoid

Answer 8

O- 1. medial end of clavicle + manubrium
I- Body of hyoid (middle)
A- depresses hyoid

Question 9

Sternothyroid

Answer 9

O- manubrium
I- oblique line of thyroid cartilage
A- depresses thyroid cartilage
(larynx)
* only infrahyoid with no action on hyoid bone

Question 10

Ant. Scalene

Answer 10

O- ant. tubercles TVP C3-C6
I- Tubercle + ridge of upper surface 1st rib
A- Elevate rib 1: forced inspiration
lat. flex, flex, contralateral flex of CS

Question 11

Middle Scalene

Answer 11

O- Post tubercles TVP C2-C7
I- Sup. surface of 1st rib
A- Elevate rib 1: forced inspiration
lat. flex, flex, contralateral flex of CS

Question 12

Post. Scalene

Answer 12

O- Post tubercles of TVP C4-C6
I- Lateral Surface 2nd rib
A- Elevate rib 2: forced inspiration
lat. flex, flex, contralateral flex of CS

Question 13

Longus Capitis

Answer 13

O- Ant. tubercles of TVP C3-C6
I- Basilar surface of Occipital bone
A- Flex , Lat Flex of head + CS

Question 14

Longus Colli

Answer 14

Inf Oblique-
O- Ant surface of bodies T1-T3
I- Ant tubercles of TVP C5-C6
Sup Oblique
O- Ant tubercles TVP C3-C5
I- anterior arch of atlas
Vertical Segment
O- Ant surface bodies C5-T3
I- ant surf. bodies C2-C4
A- Flexion and lat. flex of CS