Term
| Orbicularis orbit: origin |
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Definition
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Term
| Orbicularis orbit: action |
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Definition
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Term
| orbicularis oris: origin/insertion |
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Definition
o Muscle fibers surrounding the opening of mouth
o Skin at corner of mouth
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Term
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Definition
o Closes and protrudes lips
o Compresses lips against teeth
o Shapes lips during speech
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Term
| Platysma: origin/insertion |
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Definition
origin: fascia over deltoid and pectoralis major muscles
insertion: mandible, muscles around angle of mouth, skin of lower face
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Term
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Definition
| draws out part of lip inferiorly and posteriorly (ie pouting); depresses mandible |
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Term
| occipitalis: origin/insertion |
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Definition
origin: occipital bone, mastoid process of temporal bone
insertion: epicranial aponeurosis |
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Term
| frontalis: origin/insertion |
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Definition
origin: epicranial aponeurosis
insertion: skin superior to supraoribtal margin |
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Term
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Definition
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Term
| masseter: origin/insertion |
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Definition
origin: maxilla, zygomatic arch
insertion: angle and ramus of mandible |
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Term
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Definition
| elevates mandible, closing mouth and retracts (draws back) mandible |
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Term
temporalis: origin/insertion
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Definition
origin: temporal bone
insertion: coronoid process of ramus of mandible |
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Term
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Definition
| elevates and retracts mandible |
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Term
medial pterygoid: origin/insertion
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Definition
origin: medial surface of lateral portion of pterygoid process of sphenoid bone; maxilla
insertion: angle of ramus of mandible |
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Term
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Definition
| elevates and protracts mandible and moves mandible from side to side |
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Term
lateral pterygoid: origin/insertion
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Definition
origin: greater wing and later surface of lateral ptrerygoid process of sphenoid bone
insertion: condyle of mandible; temporomandibular joint |
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Term
| lateral pterygoid: action |
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Definition
| protracts mandible, depresses mandible as in opening mouth, and moves mandible from side to side |
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Term
sternocleidomastoid: origin/insertion
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Definition
origin: sternum and clavicle
insertion: mastoid process of temporal bone |
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Term
| sternocleidomastoid: action |
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Definition
- Acting together (bilaterally), flex cervical portion of vertebral column, extend head and elevate sternum during forced inhalation
- Acting singly (unilaterally), laterally flex and rotate head to side opposite contracting muscle
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Term
| splenius capitis: origin/insertion |
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Definition
origin: ligament nuchae and spinous process of seventh cervical vertebra and first three or four thoracic vertebrae
insertion: occipital bone and mastoid process of temporal bone |
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Term
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Definition
| acting together: extending head. Acting singly: rotate head to side opposite contracting muscle. |
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Term
External Oblique: origin/insertion
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Definition
origin: inferior eight ribs
insertion: iliac crest of linea alba |
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Term
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Definition
| acting together (bilaterally): compress abdomen and flex vertebral column. Acting singly (unilaterally): laterally flex vertebral column, especially lumbar portion, and rotate vertebral column. |
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Term
internal oblique: origin/insertion
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Definition
origin: iliac crest, inguinal ligament, and thoracocolumbar fascia
insertion: cartilage of last three or four ribs and linea alba |
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Term
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Definition
Acting together: compress abdomen and flex vertebral column
Acting singly: laterally flex vertebral column, especially lumbar portion, and rotate vertebral column. |
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Term
Transversus Abdominus: origin/insertion
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Definition
Origin: iliac crest, inguinal ligament, lumbar fascia, and cartilages of ingerior 6 ribs
Insertion: xyphoid process, linea alba, and pubis |
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Term
| Transversus Abdominus: action |
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Definition
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Term
Rectus abdominis: origin/insertion
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Definition
origin: pubic crest and pubic symphysis
insertion: cartilage of 5th-7th ribs and xiphoid process
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Term
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Definition
| flexes vertebral column. especially lumbar portion, and compresses abdomen, forced exhalation, and child birth. |
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