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Muscle Attachments Spine and Thorax

On This Page: Bones | Bony Landmarks | Muscles

Bones

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Bony Landmarks

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Muscles

Infrahyoids

Origin Omohyoid:  Superior border of scapula

Sternohyoid and Sternothyroid: Manubrium

Insertion Omohyoid and Sternohyoid: Hyoid bone

Sternothyroid: Thyroid cartilage

Actions Depress hyoid bone and thyroid cartilage

Masseter

Origin Zygomatic Arch
Insertion Angle And Ramus Of Mandible
Actions Elevate The Mandible

Occipitofrontalis

Origin Frontalis and Occipitalis: Galea aponeurotica
Insertion Frontalis: Skin over eyebrows

Occipitalis: Superior nuchal line of occiput

Actions Frontalis raises eyebrows and wrinkles forehead

Occipitalis anchors and retracts galea posteriorly

Other Muscles Of The Head

Origin  
Insertion  
Actions  

Platysma

Origin Fascia covering superior part of pectoralis major
Insertion Edge of mandible, skin of lower part of face
Actions Assists depression of mandible (TMJ) tightens neck fascia

Anterior Scalene

Origin TVPs Of 3rd To 6th Cervical Vertebrae
Insertion First Rib
Actions Bilateral: Elevate Ribs During Inhalation, Flex Head and Neck

Unilateral: With Rib Fixed, Laterally Flex Neck (Anterior And Middle), Rotate Head and Neck to Opposite Site (Anterior And Middle)

Middle Scalenes

Origin TVPs Of 2nd To 7th Cervical Vertebrae
Insertion First Rib
Actions Bilateral: Elevate Ribs During Inhalation, Flex Head And Neck

Unilateral: With Rib Fixed, Laterally Flex Neck (Anterior And Middle), Rotate Head And Neck To Opposite Site (Anterior And Middle)

Posterior Scalenes

Origin TVPs Of 5th And 6th Cervical Vertebrae
Insertion Second Rib
Actions Bilateral: Elevate Ribs During Inhalation, Flex Head and Neck

Sternocleidomastoid

Origin Sternal: Head Top Of Manubrium

Clavicular: Head Medial One-Third Of Clavicle

Insertion Mastoid Process Of Temporal Bone, Lateral Superior Line Of Occiput
Actions Unilateral: Laterally Flex Head To Same Side, Rotate Head To Opposite Side

Bilateral: Flex Neck, Assist In Inspiration

Suprahyoids And Digastric
 

  Subprahyoids Digastric
Origin Geniohyoid and Mylohyoid underside of mandible

Stylohyoid Styloid process

Mastoid process deep to SCM and splenius capitis
Insertion Hyoid bone Inferior border of mandible
Actions Elevate hyoid and tongue, depress mandible (TMJ) With hyoid bone fixed depresses mandible (TMJ)

With mandible fixed elevates hyoid

Retracts mandible

Temporalis

Origin Temporal Fossa And Fascia
Insertion Coronoid Process Of The Mandible
Actions Elevate, Retract The Mandible

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