Study Sheet.pdf Axial Musculature Flashcards
It’s important with this muscular unit, to look at names carefully. Therefore…
What are the two belly’s of the occipitofrontalis?
Occipital
Frontal
Function of frontal belly of….?
Moves scalp, eyebrows; wrinkles skin of forehead.
(occipitofrontalis)
Origin and Insertion of….?
Origin: Epicranial aponeuroisis
Insertion: Skin over supraorbital margin (eyebrown skin)
Origin and insertion of _______?
Origin: Medial wall or margin of orbit
Insertion: Skin surrounding eyelids
Function of the…?
Closes eye; produces winking, blinking, squinting
(orbicularis oculi)
Function of the ______?
Draws corners of mouth inferiorly and laterally (“frown” muscle)
(Depressor anguli oris)
Origin and Insertion of the……?
Origin: Body of mandible
Insertion: Skin at inferior corner (angle) of mouth. 👄
Function/Action of…
Elevates corner of the mouth (“smile” muscle)
(Zygomaticus major)
Origin and insertion of…
Origin: Zygomatic bone
Insertion: Skin at superolateral edge of mouth
Function of ……? (muscle in green)
Elevates and protracts mandible; prime mover of jaw closure.
(
Origin and Insertion of…
Origin: Zygomatic arch
Insertion: Ramus (lateral surface) and angle of mandible
Function of ……?
Unilateral action: lateral flexion, rotation of head to opposite side
Bilateral action: Flexes neck
Origin and Insetion of….?
Origin: Manubrium and sternal end of clavicle
Insertion: Mastoid Process
Function of…?
Unilateral Action: Turns head to same side.
Bilateral action: Flexes neck
(Splenius capitis)
Origin and insertion of…?
Origin: Ligamentum nuchae and spinous processes of c7-t3
Insertion: Occipital bone and mastoid process of temporal bone.
Function of…
Contraction: causes flattening of diaphragm (moves inferiorly) and thus expansion of thoracic cavity; increases pressure in abdominopelvic cavity
Function of…
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)
Origin and Insertion of….
Origin: External and inferior borders of the inferior 8 ribs.
Insertion: Linea alba by a broad aponeurosis; some to iliac crest.
Function of…
Flexes vertebral column and compresses abdominal wall; used in forced exhalation.
(Rectus abdominus)
Origin and Insertion of…
Origin: Superior surface of pubis near symphysis
Insertion: Xiphoid process of sternum; inferior surfaces of ribs 5-7
