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O: ligamentum nuchae, spinous processes C7-T12
I: acromion process, spine of scapula, and lateral third of the clavicle
extend the head, elevate, retract and upwardly rotate or depress the pectoral girdle
O: Spinous processes of T6 and lower, thoracolumbar fascia, illiac crest and lower ribs
I: intertubercular goove of the humerus
Splenius Capitis and Cervicis
O: inferior half of ligamentum nuchae, spinous processes of C and upper T vertebrae
I: Splenius Capitis inserts in mastiod process and adjacent occipital bone. Cervicis inserts on transverse processes of upper cervical vertabrae
Semispinalis capitis, cervicis, and thoracis
originate from upper half of the spine, contralaterally rotate and extend the head
heaviest in the lumber spine, spans 3 segments, originates on mammillary processes and inserts on spinous processes
surrounds posterior neck and encloses cervical spinal column and its mm. Makes the floor of the suboccipital triangle
arises from subclavian and acends through C6 and up, passes over posterior arch of the atlas and pierces dura mater to go through foramen magnum
origination of CN XI
arises from C1-C5 and ascends through foramen magnum then descends through jugular foramen to supply Trapezius
only has motor fibers
innervates suboccipital mm, rectus capitis posterior minor, and semispinalis capitis
greater occipital n
carries sensory for both itself and suboccipital
innervates semispinalis capitis
Functions of SCM
protects major blood vessels in the carotid sheath, flexes cervical spine,produces ipsilateral rotation of the head
Posterior cervical triangle contents
spinal accessory n divides it into superior (carefree) and inferior (careful) zones
posterior belly of the omohyoid
C2-C3 (climb the tree)
greater auricular n
lesser occipital n - to scalp
transverse cervical n - proceeds anteriorly
C3-C4 (hit the floor)
medial, intermediate and lateral supraclavicular nn
muscles to the floor of the posterior cervical triangle innervated by posterior primary rami
part of semispinalis capitis
muscles to the floor of the posterior cervical triangle innervated by anterior primary rami
levator scapulae (dorsal scapular n and C3-C4)
scalenus anterior, medial and posterior
where does brachial plexus appear in the posterior cervical trangle?
in between scalenus anterior and scalenus medial
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