Muscles: Neck (Dustin) Flashcards Preview

Y Anatomy I > Muscles: Neck (Dustin) > Flashcards

Flashcards in Muscles: Neck (Dustin) Deck (33)
Loading flashcards...
1

Sternocleidomastoid  

superficial neck muscle
1. Arises: 
o Sternal  head: 
• Manubrium  of  the  sternum 
o Clavicular  head: 
• Medial  third  of  the  clavicle 
2. Inserted: 
o Mastoid  process  and  superior  nuchal  line 
3. Movement: 
o Individually: 
Marius 
• Tilts  head  to  the  same  side 
• Rotates  head  to  the  opposite  side 
o  Together: 
• Ventral  flexion  of  the  head 
4. Innervation: 
o Accessory  nerve  (cranial  nerve  XI) 

2

what is this muscle group and what is the function of their movement?

Infrahyoid muscles

Move  thyroid  cartilage  and  hyoid  bone  together 
Pull  hyoid  bone  and  the  laryngeal  cartilages  downward 
Together  with  the  suprahyoid  muscles  they  bend  the  head  forward  with  mouth 
closed 
The  omohyoid  muscle  prevents  pressure  on  the  large  underlying  vein  and 
assists  in  opening  the  mouth  and  in  flexion,  lateral  flexion  and  rotation  of  the 
head 

3

Sternohyoid  
1. Arises: 
o Posterior  surface  of  the  manubrium 
o Sternal  end  of  clavicle 
2. Inserted: 
o Inner  surface  of  hyoid  bone 
3. Innervation: 
o Cervical  ansa  of  the  cervical  plexus 

4

Omohyoid 
Inferior  belly 
1. Arises: 
o Superior  margin  of  scapula,  adjacent  to  the 
scapular  notch 
2. Inserted: 
o Intermediate  tendon 
3. Innervation: 
o Cervical  ansa  of  the  cervical  plexus 
Superior  belly:  
1. Arises: 
o Intermediate  tendon 
2. Inserted: 
o Body  of  the  hyoid  bone 
3. Innervation: 
o Cervical  ansa  of  the  cervical  plexus 

5

Sternothyroid  
1. Arises: 
o Posterior  surface  of  manubrium 
2. Inserted: 
o Thyroid  cartilage 
3. Innervation: 
o Cervical  ansa  of  the  cervical  plexus 

6

Thyrohyoid  
Is  a  continuation  of  the  sternothyroid. 
1. Arises: 
o Thyroid  cartilage 
Marius 
2. Inserted: 
o Body  of  the  hyoid  bone 
3. Innervation: 
o Ventral  ramus  of  C1 

7

what is this muscle group?

suprahyoid muscles:

stylohyoid

mylohyoid

geniohyoid

anterior and posterior bellies of digastric

8

Stylohyoid  
1. Arises: 
o Styloid  process  of  the  temporal  bone 
2. Inserted: 
o Body  of  the  hyoid  bone  by  a  split  tendon  (split  by  the 
digastric  muscle) 
3. Movement: 
o Elevated  the  hyoid  bone  (during  swallowing) 
o Assist  in  opening  the  mandible 
4. Innervation: 
o Facial  nerve

9

Mylohyoid  
1. Arises: 
o Mylohyoid  line  of  the  mandible 
2. Inserted: 
o Body  of  the  hyoid  bone  by  a  median  tendon  of 
insertion  (mylohyoid  raphe) 
3. Movement: 
o Tightens  and  elevates  the  oral  floor 
o Draws  the  hyoid  bone  forward  (during 
swallowing) 
o Assist  in  opening  the  mandible  and  moving  it 
from  side  to  side 
4. Innervation: 
o Mylohyoid  nerve  (from  the  mandibular  nerve) 

10

Geniohyoid  
1. Arises: 
o Mental  spine 
2. Inserted: 
o Body  of  the  hyoid  bone 
3. Movement: 
o Draws  the  hyoid  bone  forward  (during 
swallowing) 
o Assist  in  opening  the  mandible 
4. Innervation: 
o Ventral  ramus  of  C1

11

Anterior and Posterior Bellies of Digastric Muscle
Posterior  belly 
1. Arises: 
o Mastoid  notch  (medial  to  the  mastoid  process) 
2. Inserted: 
o Intermediate  tendon,  into  the  hyoid  bone 
3. Movement: 
o Elevates  the  hyoid  bone  (during  swallowing) 
o Assist  in  opening  the  mandible 
4. Innervation: 
o Facial  nerve 
Anterior  belly  
1. Arises: 
o Digastric  fossa  of  the  mandible 
2. Inserted: 
o Intermediate  tendon,  into  the  hyoid  bone 
3. Movement: 
o Elevates  the  hyoid  bone  (during  swallowing) 
o Assist  in  opening  the  mandible 
4. Innervation: 
o Mylohyoid  nerve  (from  the  mandibular  nerve)

12

(broad muscular area)

Platysma 
The  platysma  is  a  broad,  flat,  subcutaneous  muscular  sheet.  
1. Arises: 
o Below  the  clavicle,  from  the  pectoral  fascia 
2. Inserted: 
o Medial  fibers: 
• Into  the  mandible 
o Lateral  fibers: 
• Joins  the  muscles  around  the  mouth 
3. Movement: 
o Tenses  the  skin 
o Can  move  the  lower  lip  and  the  corners  of  the  mouth  down 
4. Innervation: 
o Facial  nerve

13

triangles of the neck: A

mandible

14

triangles of the neck: B

hyoid bone

15

triangles of the neck: C

clavicle

16

triangles of the neck: D

trapezius muscle

17

triangles of the neck: E

sternocleidomastoid

18

triangles of the neck: F

omohyoid muscle

runs deeper than sternocleidomastoid

19

triangles of the neck: G

posterior belly of digastric

20

triangles of the neck: H

anterior belly of digastric

21

triangles of the neck: 1

anterior triangle

22

triangles of the neck: 2

posterior triangle

contains Erb's Point aka punctum nervosum, where 6 nerves meet. Injury to this area results in paralysis of arm muscles

23

triangles of the neck: 3

muscular triangle

aka inferior carotid triangle

-infrahyoid muscles

-thyroid gland

24

triangles of the neck: 4

submental triangle

 

-submental lymph nodes

-small veins

25

triangles of the neck: 5

occipital triangle

aka omotrapezoid triangle

-external jugular vein

-brachial plexus

-cervical plexus

-spinal accessory nerve

26

triangles of neck: 6

supraclavicular triangle

aka subclavian triangle or omoclavicular triangle

-subclavian artery and vein

-suprascapular artery

-usually some lymph glands

27

triangles of neck: 7

submandibular triangle

aka digastric triangle

-facial artery and vein

-submandibular glands

-lymph nodes

-mylohyoid nerve

28

triangles of neck: 8

carotid triangle

contains carotid sheath: internal jugular vein, common carotid artery, vagus nerve

-hypoglossal n

-ansa cervicalis

-accessory nerve

29

which fascia is in red?

superficial lamina of (or investing layer of) deep cervical fascia

 

surrounds the neck like a collar, it splits around the sternocleidomastoid muscles and the trapezius muscles. Posteriorly (towards the back of the neck), it blends with ligamentum nuchae.

(1 out of 3 deep cervical layers)

30

which fascia is in blue?

which is in purple?

what do they make together?

blue = visceral pretracheal cervical fascia

-extends medially in front of the carotid vessels, and assists in forming the carotid sheath

-fixed to the hyoid bone

-encloses the thyroid

purple = muscular pretracheal cervical fascia

 

together they make up the middle cervical fascia part of the deep cervical fascia