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16 Cards in this Set

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  • Back

Frontal Belly of occipitofrontalis


Origin=frontal bone and skin of eyebrows


Insertion=epicranial aponeurosis (galea aponeurotica


Action= moves the scalp, wrinkles forehead, and elevates the eyebrows.

Occipital Belly of the occipitofrontalis

Origin= superior nuchal line


Insertion=epicranial aponeurosis


Action= moves the scalp slightly posteriorly

Orbicularis Oris

Origin= mandible and maxillae as well as fascia and fibers from the other muscles


Insertion= skin and lips surrounding the mouth


Action= closes lips, puckers up the lips

Platysma

Origin=fascia of deltoid and pectoralis major muscles and acromion of scapula



Insertion= skin of cheek and mandible



Action= pulls lower lip inferiorly, tenses skin of neck and contributes to depression of the mandible

Buccinator

Origin= alveolar processes of mandible and maxillae



Insertion= orbicularis oris



Action=compresses cheeck, hold food between teeth during chewing, aids in sucking and blowing

Temporalis

Origin= superior and inferior portions of temporal bone



Insertion= coronoid process of mandible



Action= elevates and retracts mandible

Masseter

Origin= zygomatic arch



Insertion= lateral surface of coronoid process; lateral surface and angle of mandible



Action=Elevates and protracts mandible; prime mover of jaw closure

Medial and Lateral Pterygoid

Origin= pterygoid process of the sphenoid bone



Insertion= mandible



Action= elevate and protract the mandible and move it from side to side during chewing

Anteriorlateral neck muscles

Origin=manubruim and sternal ends of clavicles



Insertion= mastoid process of temporal bones



Action= when both contract, the head is pulled forward and down (flexion of cervical vertebrae and flexion of atlanto occipital joint). When one contracts, it turns the head sideways in a direction opposite the side on which the contracting muscle is located (lateral flexion of the cervical vertebrae and rotation of the atlantoaxial joint)

Splenius capitus

Origin=ligamentum nuchae



Insertion= occipital bone and mastoid process of temporal bone



Action=When both contract, it pulls the head back and extends and hyperextends the cervical vertebrae. When one contracts it turns the head sideways in a direction towards the same side on which the contracting muscle is located.

Semispinalis capitus

Origin= seventh cervical vertebrae and first six throracic vertebrae



Insertion= between the superior and inferior nuchal lines of the occipital bone



Action= same as the Splenuis capitus

Diaphram

Origin= inferior internal surface of lower ribs, xiphoid process of sternum, costal cartilages of inferior ribs, and lumbar vertebrae



Insertion= "central tendon" (strong aponeurosis that is the insertion for all peripheral muscle fibers of the diaphram)



Action=contraction during inhalation causes flattening of the diaphram (moves inferiorly), thereby expanding the thoracic cavity and compressing the abdominopelvic cavity. During exhalation the diaphram rocoils passively upwards, pulled by the elastic fibers in the lung tissue, to resume its dome shape.

External Oblique

Origin= external inferior borders of lower ribs



Insertion= linea alba by a broad aponeurosis; some to the iliac crest



Action=When both contract, they compress the abdomen and flex the vertebral column. When only one contracts, it causes lateral flexion of the vertebral column.

Internal Oblique

Origin= lumbar fascia, infuinal ligament, and iliac crest



Insertion= linea alba, pubic crest, costal cartilages and surfaces of lower ribs



Action=same as external oblique

Transverse abdominis

Origin= iliac crest, lumbar fascia, inguinal ligament, and cartilages of lower ribs



Insertion= linea alba and pubic crest



Action=primarily compresses the abdomen

Rectus Abdominis

Origin= superior surface of pubis near symphysis



Insertion= xiphoid process of sternum and inferior surfaces of middle ribs



Action=Flexes vertebral column and compresses the abdominal wall; used in forceful exhalation