Study Sheet.pdf Axial Musculature

Question 1

It’s important with this muscular unit, to look at names carefully. Therefore…

What are the two belly’s of the occipitofrontalis?

Answer 1

Occipital

Frontal

Question 2

Function of frontal belly of….?

Answer 2

Moves scalp, eyebrows; wrinkles skin of forehead.

(occipitofrontalis)

Question 3

Origin and Insertion of….?

Answer 3

Origin: Epicranial aponeuroisis

Insertion: Skin over supraorbital margin (eyebrown skin)

Question 4

Origin and insertion of _______?

Answer 4

Origin: Medial wall or margin of orbit

Insertion: Skin surrounding eyelids

Question 5

Function of the…?

Answer 5

Closes eye; produces winking, blinking, squinting

(orbicularis oculi)

Question 6

Function of the ______?

Answer 6

Draws corners of mouth inferiorly and laterally (“frown” muscle)

(Depressor anguli oris)

Question 7

Origin and Insertion of the……?

Answer 7

Origin: Body of mandible

Insertion: Skin at inferior corner (angle) of mouth. 👄

Question 8

Function/Action of…

Answer 8

Elevates corner of the mouth (“smile” muscle)

(Zygomaticus major)

Question 9

Origin and insertion of…

Answer 9

Origin: Zygomatic bone

Insertion: Skin at superolateral edge of mouth

Question 10

Function of ……? (muscle in green)

Answer 10

Elevates and protracts mandible; prime mover of jaw closure.

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Question 11

Origin and Insertion of…

Answer 11

Origin: Zygomatic arch

Insertion: Ramus (lateral surface) and angle of mandible

Question 12

Function of ……?

Answer 12

Unilateral action: lateral flexion, rotation of head to opposite side

Bilateral action: Flexes neck

Question 13

Origin and Insetion of….?

Answer 13

Origin: Manubrium and sternal end of clavicle

Insertion: Mastoid Process

Question 14

Function of…?

Answer 14

Unilateral Action: Turns head to same side.

Bilateral action: Flexes neck

(Splenius capitis)

Question 15

Origin and insertion of…?

Answer 15

Origin: Ligamentum nuchae and spinous processes of c7-t3

Insertion: Occipital bone and mastoid process of temporal bone.

Question 16

Function of…

Answer 16

Contraction: causes flattening of diaphragm (moves inferiorly) and thus expansion of thoracic cavity; increases pressure in abdominopelvic cavity

Question 17

Function of…

Answer 17

Unilateral Action: Lateral flexion of vertebral column; rotation of vertebral column to the opposite side.

Bilateral Action: Flexes vertebral column and compresses abdominal wall; used in forced exhalation.

(External Oblique)

Question 18

Origin and Insertion of….

Answer 18

Origin: External and inferior borders of the inferior 8 ribs.

Insertion: Linea alba by a broad aponeurosis; some to iliac crest.

Question 19

Function of…

Answer 19

Flexes vertebral column and compresses abdominal wall; used in forced exhalation.

(Rectus abdominus)

Question 20

Origin and Insertion of…

Answer 20

Origin: Superior surface of pubis near symphysis

Insertion: Xiphoid process of sternum; inferior surfaces of ribs 5-7