Axial Muscles Flashcards Preview

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Flashcards in Axial Muscles Deck (32):
1

What are the 4 groups of axial muscles

Muscles of the head and neck, muscles of the vertebral column, muscles of the trunk, muscles of the pelvic floor

2

Muscles of facial expression typically originate on the surface of the skull and they insert into the superficial fascia and dermis of the skin. When these muscles contract, the skin moves and results in facial expressions

Muscles of facial expression typically originate on the surface of the skull and they insert into the superficial fascia and dermis of the skin. When these muscles contract, the skin moves and results in facial expressions

3

What is the origin, insertion, and action of the orbicularis oris

Origin-maxillary bone and mandible
Insertion- lips
Action- compresses purses lips

4

What is the origin, insertion, and action of the orbicularis oculi

Origin-medial margin of orbit
Insertion-skin around eyelids
Action-closes eyes

5

What is the origin, insertion, and action of the frontal belly

Origin-epicranial aponeurosis
Insertion-skin of eyebrow and bridge of nose
Action-raises eyebrows, wrinkles forehead

6

What is the origin, insertion, and action of the occipital belly

Origin-occipital and temporal bone
Insertion-epicranial aponeurosis
Action-tenses and retracts scalp

7

What is the origin, insertion, and action of the platysma

Origin-superior thorax between cartilage of 2nd rib and acromion of scapula
Insertion-mandible and skin of cheek
Action-tenses skin of neck, depresses mandible and pulls lower lip inferiorly

8

Where are the temporalis, masseter, lateral/medial pterygoid located

Look at picture

9

What are the superficial muscles of mastication and what are their functions

Temporalis and masseter are both jaw closers

10

What are the deep muscles of mastication and what are their functions

Medial pterygoid is a jaw closer
Lateral pterygoid is a jaw opener

11

What is the origin, insertion, and action of the masseter

Origin- zygomatic arch
Insertion- lateral surface of mandibular ramus
Action- elevates mandible and closes the jaws

12

What is the origin, insertion, and action of the temporalis

origin-along temporal lines of skull
insertion-coronoid process of mandible
action-elevates mandible

13

What is the origin, insertion, and action of the pterygoids

Origin- lateral pterygoid plate
Insertion- medial surface of mandibular ramus
Action-
Medial:elevates the mandible and closes the jaws, or slides the mandible from side to side
Lateral:opens the jaws, protrudes the mandible, or slides the mandible from side to side

14

What is the origin, insertion, and action of the inferior rectus

Origin-sphenoid around optic canal
Insertion-inferior,medial surface of eyeball
Action-eye looks inferiorly

15

What is the origin, insertion, and action of the medial rectus

Origin-Sphenoid around optic canal
Insertion-medial surface of eyeball
Action-Eye looks medially

16

What is the origin, insertion, and action of the superior rectus

Origin-sphenoid around optic canal
Insertion-superior surface of eyeball
Action-eye looks superiorly

17

What is the origin, insertion, and action of the lateral rectus

Origin-sphenoid around optic canal
Insertion-lateral surface of eyeball
Action-eye looks laterally

18

What is the origin, insertion, and action of the inferior oblique

Origin-maxillary bone at anterior portion of orbit
Insertion-inferior, lateral surface of eyeball
Action-eye rolls, looks superiorly and laterally

19

What is the origin, insertion, and action of the superior oblique

Origin-sphenoid around optic canal
Insertion-superior, lateral surface of eyeball
Action-eye rolls, looks inferiorly and laterally

20

What is the origin, insertion, and action of the genioglossus

Origin-medial surface of mandible around chin
Insertion-body of tongue, hyoid bone
Action-depresses and protracts tongue

21

What is the origin, insertion, and action of the sternocleidomastoid

Origin-one head attaches to sternal end of clavicle, the other attaches to manubrium
Insertion-mastoid region of skull and lateral portion of superior nuchal line
Action-flexes the neck; one alone bends head toward shoulder and rotates neck

22

What are erector spinae muscles

represent a mass of muscle that extends from the sacrum to the skull. They are superficial extensors of the vertebral column

23

The erector spinae muscles are made up of the following muscle groups

spinalis (attach to spinous processes)
longissimus (attach to transverse processes)
iliocostalis (attach to ribs)
These muscles arise from a broad attachment to the posterior part of the iliac crest, sacrum and spinous processes. Their distal attachments are to ribs, transverse processes and spinous processes of vertebrae.
Acting bilaterally, they extend the vertebral column. Acting unilaterally, they laterally flex the vertebral column.

24

What is the origin, insertion, and action of the scalenes

Origin- transverse and costal processes of cervical vertebrae
Insertion-superior surfaces of first two ribs
Action-Elevate ribs or flex neck

25

What is the origin, insertion, and action of the external intercostals

Origin-inferior border of each rib
Insertion-superior border of more inferior rib
Action-elevates ribs

26

What is the origin, insertion, and action of the internal intercostals

Origin-superior border of each rib
Insertion-inferior border of the preceding rib
Action-depress ribs

27

What is the origin, insertion, and action of the external oblique

Origin-external and inferior borders of ribs 5-12
Insertion-linea alba and iliac crest
Action-compresses abdomen, depresses ribs, flexes or bends spine

28

What is the origin, insertion, and action of the internal oblique

Origin-lumbodorsal fascia and iliac crest
Insertion-inferior ribs, xiphoid process, and line alba
Action-compresses abdomen, depresses ribs, flexes or bends spine

29

What is the origin, insertion, and action of the diaphram

Origin- xiphoid process, cartilages of ribs 4-10, and anterior surfaces of lumbar vertebrae
Insertion-central tendinous sheet
Action-contraction expands thoracic cavity, compresses abdominopelvic cavity

30

What is the origin, insertion, and action of the rectus abdominis

Origin-superior surface of pubis around symphysis
Insertion-inferior surfaces of costal cartilages(ribs 5-7) and xiphoid process
Action-depresses ribs, flexes vertebral column, compresses abdomen

31

What muscles make up the urogenital triangle

Bulbospongiosus, ischiocavernosus, superficail transverse perineal, urogenital diaphragm, deep transverse perineal, external urethral sphincter

32

What muscles make up the anal triangle

Pelvic diaphragm, coccygeus, levator ani, iliococcygeus, pubococcygeus