Exam 2: Muscles of Head, Neck, and Trunk Flashcards Preview

Anatomy A-215 > Exam 2: Muscles of Head, Neck, and Trunk > Flashcards

Flashcards in Exam 2: Muscles of Head, Neck, and Trunk Deck (40):
1

Naming of Muscles

-actions

-body regions

-attachments

-fiber oreientation

-shape/size

-muscle head/tendons of origin

2

Epicranius 

-composed of the occipitofrontalis muscle and an epicranial aponeurosis (flattened tendon)

3

Frontal Belly of Occipitofrontalis 

-elevates eyebrows and wrinkles skin of forehead

4

Occipital Belly of Occipitofrontalis

-retracts scalp slightly 

5

Orbicularis Oculi

-closes the eyes

-wink, blink, squint

6

Orbicularis Oris

-closes and purses lips

-kiss, pucker

7

Zygomaticus Major

-elevates corner of mouth

-smile

8

Depressor Anguli Oris

-depresses corner of mouth

-frown

9

Buccinator

-pulls cheeks against teeth when chewing

-some trumpet players stretch this out 

10

Platysma

-tenses skin of neck, and depresses lower lip

-pout 

11

Masseter

-elevates and protracts mandible

-muscle of mastication

   

12

 Temporalis

-elevates and retracts mandible

-muscle of mastication

    

13

Medial Pterygoid

-elevates mandible and moves mandible side to side

-muscle of mastication

   

14

 Lateral Pterygoid

-elevates mandible and moves mandible side to side

-muscle of mastication

15

 Genioglossus

-protracts (protrudes) tongue

 

16

    Styloglossus

- retracts tongue

 

17

    Hyoglossus 

-depresses tongue 

18

Sternocleidomastoid

-each rotates head to one side, together: flex the head/neck

-attaches to sternum, clavicle, and mastoid process

-posterior neck muscle 

19

Splenius Capitis 

-each rotates head to one side, together: extend the head/neck

-head bandage 

-posterior neck muscle

-Sternocleidomastoid and Slenius Capitis work together to rotate head but they perform opposite functions regarding flexing or extending the neck

20

Digastric
 

            

       -elevates hyoid

-depresses mandible

-suprahyoid muscle

-anterior neck muscle

21

Stylohyoid

-elevates hyoid bone

-suprahyoid muscle

-anterior neck muscle

 

22

Mylohyoid

-elevates hyoid and raises floor of mouth

-suprahyoid muscle

-anterior neck muscle

 

23

Geniohyoid

- elevates hyoid bone

-suprahyoid muscle

-anterior neck muscle

24

Sternohyoid
           

-depresses hyoid

-infrahyoid muscle

-anterior neck muscle

 

25

Omohyoid

-depresses hyoid

-infrahyoid muscle

-anterior neck muscle

 

26

Sternothyroid

-depresses thyroid cartilage (not bone)

-infrahyoid muscle

-anterior neck muscle

 

27

Thyrohyoid

-depresses hyoid and raises thyroid cartilage

-infrahyoid muscle

-anterior neck muscle

28

Superficial Back Muscles

-move the scapula and humerus 

29

Quadratus Lumborum

-together: extend lumbar vertebral column

-unilaterally: each laterally flexes vert column

-deep back muscle

30

Erector Spinae Group of Muscles
           

 

-Extend vertebral column

-Consists of:

a. Iliocostalis: lateral

b. longissimus: intermediate

c. spinalis: medial

-deep back muscles

31

Superficial Thorax Muscles

-move upper limb, not ribs

32

Deep Thorax Muscles

-respiration muscles 

33

Diaphragm

-contraction pulls the central portion down, increasing vertical dimensions of thorax

-deep thorax muscle

 

34

External Intercostals

-elevate ribs during inhalation

-fibers run inferomedially

-deep thorax muscle

 

35

Internal Intercostals

-depress ribs during exhalation

-fibers run inferolaterally 

-deep thorax muscle

36

External Abdominal Oblique

-bilaterally flex vertebral column andcompress abdominal wall

-unilaterally: lateral flexion of vertebral column 

-fibers run inferomedially 

-similar to external intercostals 

37

Internal Abdominal Oblique

-bilaterally: flex vertebral column and compress abdominal wall

-unilaterally: lateral flexion of vertebral column 

-fibers run inferolaterally 

-similar to inferior intercostals

38

Transversus Abdominus 

-bilaterally: flex vertebral column and compress abdominal wall

-unilaterally:laterally flexes vertebral column

39

Rectus Abdominus

-flex vertebral column and compress abdominal wall 

-straight fibers

40

Muscles of the Pelvic Floor and Perineum

-close inferior opening of pelvis

        -support the pelvic organs

-assist with defecation, voluntary part of urination, and childbirth