Sternocleidomastoid (SCM)

ORIGIN:

Sternal Fibers: Manubrium / Sternum

Clavicular Fibers: Medial, Superior Clavicle

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Sternocleidomastoid

Insertion:

Mastoid Process

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Sternocleidomastoid

Actions:

Bilaterally: Neck Flexion

Unilaterally:Roatation to the Opposite Side  &

Lateral Flexion

(Accesory Muscles Of Respiration)

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Scalenes

Origin:

Transverse Processes of C2-C7

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Scalenes

Insertion:

Anterior and Middle Scalenes: RIB 1

Posterior Scalene: Rib 2

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Scalenes

Action:

Bilaterally: Flexion and Elevation of the ribacge during Inhalation

Unilaterally: Lateral Flexion

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Splenius Capitis

Origin:

Ligamentum nuchae, spinous process of (about)

C7-T6

[image]*Deep to Traps and rhomboids

Splenius Capitis

Insertion:

Mastoid process ( Deep to SCM)

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Splenius Capitis

Actions:

Bilaterally: Extension

Unilaterally: Lateral Flexion

&

Rotation to the Same Side

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Splenius Cervicis

Origin:

Spinous Processes of T3-T6

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Splenius Cervicis

Insertion:

Transverse Processes of C1-C3

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Splenius Cervicis

Action

Bilateral: Extension

Unilateral: Rotation to Same Side &

Lateral Flexion

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Upper Traps

Origin:

Nuchal Lines Until the Spinous Processes of C7

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Upper Traps

Insertion

Posterior Aspect of the Lateral Clavicle

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Upper Traps

Action:

Elevation of Shoulder Girdle

Upward Rotation of Scapula

*

Bilateral : Extension of Neck

Unilaterally: Lateral Flexion & Rotation to Opposite Side

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Middle Traps

Origin:

Spinous Processes T1-T5

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Middle Traps

Insertion:

Acromion Process

Superior Aspect of Spine of Scapula

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Middle Traps

Action:

Retraction

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Lower Traps

Origin:

Spinous Processes T6-T12

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Lower Traps

Insertion

Root of the Spine of Scapula (Inferior Aspect)[image]

Lower Traps

Action:

Rhomboids

Origin:

Minor: Spinous Processes of C7- T1

Major: Spinous Processes of T1-T5

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Rhomboids

Insertion:

Medial Border of Scapula from Root of the spine to the inferior angle.

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Rhomboids

Action:

Retraction

Downward Rotation

[image][image]