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A&P LabMuscle Chart

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Nasalis   Origin-Maxillary bone; alar cartilage of nose Insertion- Bridge of nose Action-Compresses nostrils  
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Orbicularis oculis   Origin:Medial aspect of bony orbit Insertion:Skin around eyelids Action:Closes eyelid;  
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Buccinator   Origin:Maxillary bone; mandible Insertion:Blends with fibers of orbicularis oris Action:Compresses cheek while whistling or blowing  
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Zygomaticus major   Origin:Zygomatic bone Insertion:Angle of mouth Action:Raises lateral corner of mouth for smiling  
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Zygomaticus minor   Origin:Zygomatic bone Insertion:Upper lip Action:Raises upper lip  
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Levator Labii Superioris   Origin:Inferior aspect of bony orbit Insertion:Blends with fibers of orbicularis oris Action:Elevates upper lip;  
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Depressor Anguli Oris   Origin:Anterolateral surface of mandible Insertion:Skin at angle of mouth Action:Depresses angle of mouth  
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Depressor Labii Inferioris   Origin:Anterolateral surface of mandible Insertion:Skin of lower lip Action:Depresses lower lip  
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Mentalis   Origin:Anterior surface of mandible Insertion:Skin of chin Action: wrinkles skin on chin  
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Masseter   Origin:Zygomatic arch Insertion:Lateral Surface of mandibular ramus Action:Elevates mandible to close jaw; protrudes mandible  
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Temporalis   Origin:Temporal bone Insertion:Coronoid process of mandible Action:Elevates mandible to close jaw  
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Hyoglossus   Origin:Hyoid bone Insertion:Tongue Action:Depresses tongue  
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Sternocleidomastoid   Origin:Manubrium; medial one-third of clavicle Insertion:Mastoid process; occipital bone near mastoid process Action:Flexion and lateral flexion of neck  
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Mylohyoid   Origin:Inferior margin of mandible at the chin Insertion:Hyoid bone Action:Elevates hyoid bone, tongue, and floor of mouth during swallowing and speaking  
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Sternohyoid   Origin:Manubrium Insertion:Hyoid bone Action  
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Thyrohyoid   Origin:Thyroid cartilage of larynx Insertion:Hyoid bone Action:Depresses hyoid bone;  
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Splenius   Origin:Spinous processes of inferior cervical and superior thoracic vertebrae Insertion;Mastoid process, occipital bone and transverse processes of superior cervical vertebrae Action:Laterally flexes, rotates, and extends head and neck  
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Scalenes(Posterior, middle, and anterior   Origin:Transverse processes of cervical vertebrae Insertion:First and second ribs Action:Lateral flexion of neck; elevates ribs 1 and 2 during forced inspiration  
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Levator Scapulae   Origin:Transverse processes of superior four cervical vertebrae Insertion:Medial border of scapula near superior angle Action:Elevates scapula; inferior rotation of scapula  
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External intercostals   Origin:Inferior border of superior rib Insertion:Superior border of inferior rib Action:Elevates the ribs during normal inspiration  
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Internal Intercostals   Origin:Superior border of inferior rib Insertion:Inferior border of superior rib Action:Depresses the ribs during forced expiratio  
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Rectus Abdominis   Origin;Pubic crest; pubic symphysi Insertion:Xiphoid process; costal cartilages of ribs 5-7 Action:stabilizes pelvis during walking;  
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External Oblique   Origin:External surfaces of inferior eight rib Insertion:Linea alba; pubic crest; pubic tubercle; iliac crest Action: Rotation and lateral flexion of trunk;  
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Interal Oblique   Origin:Thoracolumbar fascia; iliac crest; inguinal ligament Insertion:Linea alba; pubic crest; inferior three or four ribs Action:Rotation and lateral flexion of trunk  
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Transversus Abdominis   Origin:Thoracolumbar fascia; inguinal ligament; costal cartilages of inferior six ribs; iliac crest Insertion:Linea alba; pubic crest Action;Increases intraabdominal pressure during forced expiration  
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Orbicularis oris   Origin :Maxillary bone; mandible Insertion:Lips Action:Closes and protrudes lips as in speaking, kissing, and whistling  
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