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Originates: Temporal Fossa
Inserts: Mandible
Function: Closes and retracts the jaw.


Originates: Zygomatic Arch
Inserts: Mandible
Function: Elevates and Protracts the jaw (closes mouth)


Originates Mandible
Inserts: Corner of mouth (orbicularis oris)
Function: Presses Cheeks against Teeth
Puckers Lips


Originates: The sternum and the clavicle
Inserts: Mastoid process
Action:When both sides contract, opposite rotation occurs. Flex forward.

Orbicularis Oris

Protrudes the lips closes the mouth

Orbicularis Oculi

Closes eyes


Pulls eyebrows up and wrinkles forehead

What are the four muscles of mastication?

1. Masseter
3.Pterygoid (2)
medial pterygoid
lateral pterygoid

What action does the pterygoid make?

It moves the jaw side to side

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

Splenius Capitus

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

Iliocostalis(most lateral)
Spinalis (medial)

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: TP ttravel up 2 to 4 segments
Inserts: SP
Action: Spinal Rotation


Originates: TP
Inserts: Vertebral arch of segment above


Originates : TP
Inserts: 6 segments superiorly up
Action: Extends and Rotates

Quadratus Lumborum

Originates: Iliac Crest
Inserts: Rib 12 and TP's of L1 SIDE
Actions:Bends foot off the ground


Prime respiratory muscle


In between ribs, when breathing out internal costals pull ribs in.

Rectus Abdominis

Originates: Pubic Symphysis runs up to middle of chest. Inserts: Trunk

External Obliques

Originates: Last 8 ribs
Inserts: Iliac Crest
Action: Flexion Unilateral Rotation Contralateral Rotation

Internal Oblique

Originates: Iliac Crest
Inserts: Last 4 ribs
Action :Flexes Trunk and rotates isolateral hip

Pec Major

Originates: Sternum and Clavicle
Inserts: Humerous
Action: Flexion and adduction of humerous

Pec Minor

Originates: Ribs 3-5
Inserts: Coracoid
Action: Depression downward and rotstion of the scapula

Serratus Anterior

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.

Levator Scapulae

Originates :TP's of c1-c4
Inserts:Medial Border of scapula
Action:Elevates the scapula and downwardly rotates the scap position from glenoid cavity

Rhomdoid Major

Originates: SP of c7 to t5
Inserts: Medial Border of Scapula
Action:Downwardly rotates adduction pulls scapula toward medial line.

Rhomdoid Minor


Rotator Cuff

Head of humerous into the scapula 4 muscles SITS
Teres Minor


Originates: Supraspinous Fossa
Inserts: humerous
Action: Abduction externally rotates the arm


Originates: Infraspinous Fossa
Inserts: Humerous
Action:Adducts externally rotates the arm

Teres Minor

Originates: Inferior angle of scapula
Inserts: Humerous
Action: Aduction external Rotation


Originates: Subscapular Fossa
Inserts: Humerous
Action: Medial/Internal rotation of the arm

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