Axial Musculature (Ch 11) Flashcards Preview

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Flashcards in Axial Musculature (Ch 11) Deck (28):
1

What are the muscle of facial expression?

1. Orbicularius Oris
2. Orbicularis Oculi
3. Frontalis
4. Buccinator

2

Orbicularis Oris

-sphincter/circular
action: puckers/closes lips

attachments: (O) skin around mouth and (I) within skin of face

3

Orbicularis oculi

-sphincter/circular
action: closes eyelids

attachments: (O) skin around eyelids and (I) within skin of face

4

Frontalis

action: raises eyebrows

attachments: (O) skin on the forehead and (I) within skin of face

5

Buccinator

action: tightens the cheeks

attachments: (O) mandible/maxilla and (I) within skin of face

6

What are the muscles of mastication?

1. Temporalis
2. Masseter
3. Pterygoids

7

Temporalis

action: elevates and retracts mandible (closes jaw)

attachments: (O) lateral cranium and (I) coronoid process of mandible

8

Masseter

action: elevates mandible (closes jaw)

attachments: (O) zygomatic arch and (I) mandible

9

Pterygoids

-medial and lateral
action: elevates and protracts mandible (side to side grinding)

attachments: (O) sphenoid and (I) mandible

10

Geniglossus

action: protracts (protrudes) tongue

attachments: (O) mandible and (I) posterior part of tongue

11

Sternocleidomastoid Muscle (SCM)

actions:
1. unilateral: flexes head laterally (turns head up and to opposite side)
2. bilateral: flexes head/neck towards sternum

attachments: (O) mastoid process and (I) medial end of clavicle and sternum

12

What are the muscles of the thorax?

1. Diaphragm
2. Intercostals

13

Diaphragm

main muscle of respiration
actions:
1. Inspiration: diaphragm muscle contracts (=depresses) and increases size of thoracic cavity
2. Expiration: diaphragm relaxes, thoracic cavity decreases in size

attachments: (O) inside body wall and ribs (I) central tendon

14

Intercostals

respiratory muscles
actions:
1. External Intercostals: elevates ribs, inspiration
2. Internal Intercostals: depresses ribs, expiration (forced)

attachments: ribs

15

What are the abdominal wall muscles?

1. Rectus Abdominis
2. External Oblique
3. Internal Oblique
4. Transversus Abdominis

16

Rectus Abdominis

-midline
-fibers run superior/inferior
action: flexes trunk

attachments: (O) pubis and (I) ribs and xiphoid process

17

External/Internal Oblique

External: lateral
Internal: deep to external oblique
-fibers run obliquely by intercostals
action: flex/rotate trunk

attachments: (O) lower ribs and (I) pelvis and linea alba

18

Transversus Abdominis

-deep to internal oblique
-deepest abdominal muscles
-fibers horizontally
action: compresses abdominal cavity

attachments: (O) posterior body wall and (I) anterior body wall

19

Pelvic Diaphragm

Three layers of muscles that form pelvic floor, support abdominal contents
-spans from ischium and pubis to sacrum and coccyx
-support pelvic viscera (organs)
-openings for urethra, anus, and vagina (in females)
-levator ani muscles + coccygeus muscle + pelvic fascia
-two hiatuses (holes) to allow passage of urethra/vagina and rectum

action: supports pelvic organs

attachments: (O) pelvic outlet and (I) midline

20

Erector Spinae Muscles

1. Spinalis
2. Longissimus
3. Iliocostalis
Actions:
-bilateral: extend trunk/neck/head
-unilateral: laterally flex trunk/neck/head

attachments: (O) pelvis and (I) ribs, vertebrae, and cranium

21

Extraocular Muscles

1. superior rectus
2. inferior rectus
3. lateral rectus
4. medial rectus
5. superior oblique
6. inferior oblique

22

Superior Oblique

*extraocular muscle
action: depresses and abducts eye

attachments: (O) sphenoid and (I) eyeball

23

Inferior Oblique

*extraocular muscle
action: elevates and abducts eye

attachments: (O) maxilla and (I) eyeball

24

Medial Rectus

*extraocular muscle
action: adducts eye

attachments: (O) common tendinous ring and (I) eyeball

25

Lateral Rectus

*extraocular muscle
action: abducts eye

attachments: (O) common tendinous ring and (I) eyeball

26

Inferior Rectus

*extraocular muscle
action: depresses and adducts eye

attachments: (O) common tendinous ring and (I) eyeball

27

Superior Rectus

*extraocular muscle
action: elevates and adducts eye

attachments: (O) common tendinous ring and (I) eyeball

28

Zygomaticus Major

action: elevates angle of mouth

attachments: (O) angle of mouth and (I) anterior zygomatic