LAB Muscles 1

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    Orbicularis Oris

    Origin: various facial muscles

    Insertion: Lips

    Action: Close Lips
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    Orbicularis Oculi

    Origin: nasal portion of frontal bone

    Insertion: Eyelids

    Action: Blinking
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    Origin: Temporal Fossa

    Insertion: Coronoid Process of mandible

    Action: Elevates Jaw
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    Origin: Zygomatic Arch

    Insertion: Angle and ramus of mandible

    Action: clenches teeth
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    Origin: manubrium

    Insertion: Mastoid Process of the Temporal Bone

    Action: Rotation of head
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    Origin: manubrium

    Insertion: Hyoid

    Action: pulls down hyoid bone
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    Origin: mastoid process

    Insertion: fibrous loop on hyoid bone

    Action: raises hyoid
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    Origin: occipital bone

    Insertion: spine of scapula

    Action: hyperextends head
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    Levator Scapulae

    Origin: 1 to 4 cervical vertebrae

    Insertion: Superior angle of scapula

    Action: extends head backwards and flexes laterally
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    Splenius Group

    Origin: 1st three thoracic vertebrae

    Insertion: occipital bone

    Action: extension and rotation of head
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    Pectoralis Major

    Origin: Clavicle

    Insertion: between greater and lesser tuberacles of humerus

    Action: flexion of humerus
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    Pectoralis Minor

    Origin: Ribs 3,4,5

    Insertion: Coranoid process of the scapula

    Action: Depresses shoulder by drawing the scapula downward
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    Deltoid (anterior, middle, posterior)

    Origin: acrominon process

    Insertion: deltoid tiberosity of humerus

    Action: whole muscle abducts humerus
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    Serratus Anterior

    Origin:1st to 9th ribs

    Insertion: anterior medial border of scapula

    Action: Pulls scapula downward, forward, and inward
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    External Intercostals (11 Pairs)

    Origin: inferior borders of ribs

    Insertion: superior border of ribs

    Action: elevates ribs (aids in inspirtation)
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    Internal Intercostals (11 pairs)

    Origin: superior border of ribs

    Insertion: inferior borders of ribs

    Action: deprsses ribs (aids in expiration)
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    Origin: inferior border of the ribs and sternum

    Insertion: central tendon

    action: inspiration
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    Latissimus Dorsi

    Origin: lower 6 thoracic vertbrae

    Insertion: greater tuberacle of the humerus

    Action: extends humerous
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    Origin: infraspinous fossa of scapula

    Insertion: greater tuberacle of humerus

    Action: rotates humerus laterally
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    Teres Major

    Origin: Inferior angle of scapula

    Insertion: Crest of the lesser tuberacle of the humerus

    Action: rotates humerus medially
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    Teres Minor

    Origin: lateral border of scapula

    Insertion: lowest portion of the greater tuberacle of humerus

    Action: rotates humerus laterally
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    Origin: supraspinous fossa

    Insertion: greater tuberacle of the humerus

    Action: abduction of the humerus
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    Origin: subscapular fossa

    Insertion: lesser tubercle of the humerus

    Action: holds head of humerus in glenoid cavity
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    Rhomboideus Major

    Origin: spinous process of 1st to 5th thoracic vertebrae

    Insertion: medial border of the scapula

    Action: Adducts scapula
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    Rhomboideus Minor

    Origin: ligamentum nuchae

    Insertion: upper part of the medial border of scapula

    Action: adducts scapula
Card Set:
LAB Muscles 1
2012-04-06 01:56:34
LAB Human Muscles

LAB Human Muscles
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