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Originates: Zygomatic Arch
Function: Elevates and Protracts the jaw (closes mouth)
Inserts: Corner of mouth (orbicularis oris)
Function: Presses Cheeks against Teeth
Originates: The sternum and the clavicle
Inserts: Mastoid process
Action:When both sides contract, opposite rotation occurs. Flex forward.
What are the four muscles of mastication?
Rectus Capitis Posterior Major
Originates:Spinous Process of axis c2
Inserts: All the way up to the occipital bone
Action: Laterally Rotates
Rectus Capitus Posterior Minor
Originates: Spinous Process of c1
Inserts: Occipital bone
Actions: Laterally rotates and extends the neck
Originates: t6 all the way to c7 Sp
Inserts: Occipital bone and c1 to c3 tp's
action: When both sides contract extension occurs. When 1 side contracts lateral flexion and lateral rotation occurs
Originates: Posterior Aspect of iliac crest, Sacrum, lower lumbar vertebrae
Inserts: vertebrae and ribs and to occipital bone
Action: When it contracts you extend back. Extension occurs when both sides contract together When one side cotracts side bend.
Originates: Iliac Crest
Inserts: Rib 12 and TP's of L1 SIDE
Actions:Bends foot off the ground
Originates: Pubic Symphysis runs up to middle of chest. Inserts: Trunk
Originates: Last 8 ribs
Inserts: Iliac Crest
Action: Flexion Unilateral Rotation Contralateral Rotation
Originates: Iliac Crest
Inserts: Last 4 ribs
Action :Flexes Trunk and rotates isolateral hip
Originates: Sternum and Clavicle
Action: Flexion and adduction of humerous
Originates: Ribs 3-5
Action: Depression downward and rotstion of the scapula
Originates: Ribs 1-8
Inserts: Medial Border of the scapula
Action: Retracts the scapula and rotates upward.
Trap Muscles (3)
Originates: Occipital bone and the SP of c1-12
Inserts: Clavicle acromion end and spine of scapula
Upper: Shrugs shoulders elevates and upwardly rotates the scapula
Middle: Retracts Scapula Adducts
Lower: Depresses Scapula and upwardly Rotates.
Originates :TP's of c1-c4
Inserts:Medial Border of scapula
Action:Elevates the scapula and downwardly rotates the scap position from glenoid cavity
Originates: SP of c7 to t5
Inserts: Medial Border of Scapula
Action:Downwardly rotates adduction pulls scapula toward medial line.
Head of humerous into the scapula 4 muscles SITS
Originates: Supraspinous Fossa
Action: Abduction externally rotates the arm
Originates: Infraspinous Fossa
Action:Adducts externally rotates the arm
Originates: Inferior angle of scapula
Action: Aduction external Rotation
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