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16 Cards in this Set
- Front
- Back
Frontal Belly of occipitofrontalis
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Origin=frontal bone and skin of eyebrows Insertion=epicranial aponeurosis (galea aponeurotica Action= moves the scalp, wrinkles forehead, and elevates the eyebrows. |
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Occipital Belly of the occipitofrontalis |
Origin= superior nuchal line Insertion=epicranial aponeurosis Action= moves the scalp slightly posteriorly |
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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 |
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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 |
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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 |
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Temporalis |
Origin= superior and inferior portions of temporal bone
Insertion= coronoid process of mandible
Action= elevates and retracts mandible |
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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 |
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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 |
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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) |
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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. |
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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 |
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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. |
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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. |
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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 |
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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 |
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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 |