Suboccipital Boundaries
Rectus capitis posterior major?
What muscle as the insertion of the lateral part of inferior nuchal line of occipital bone?
Rectus capitis posterior major
What are the four nerves in the suboccipital triangle?
- Suboccipital
- Greater occipital
- Lesser occipital
- Posterior rami (nerves C3-C7)
What is the innervation of the SCM?
What is the innervation for the platysma?
Fascial nerve
What is the superolateral boundary of suboccipital triangle?
Obliquus capitis superior
What muscle has the origin of the transverse process of vertebra C1?
What 3 nerves origins are associated with the posterior aspect?
- suboccipital
- greater occipital
- posterior rami (C3-C7)
What are the two inferior/lateral attachments for the SCM?
Clavicular head
What is the main action of the trapezius?
Elevates/retracts/rotates scapulae superiorly
What is the inferolateral boundary of the suboccipital boundary?
Obliquus capitis inferior
What muscle has the insertion of the medial part of inferior nuchal line of occipital bone?
What nerves passes directly to skin?
- lesser occipital
What is the action for the unilateral contraction of the SCM?
Tilts head to same side (laterally flexes neck) & rotates it so face is turned superiorly toward opposite side
What is the action of the ascending (inferior) fibers?
Depress scapulae/shoulders
What are the contents of the suboccipital triangle?
vertebral artery + suboccipital nerve
What muscles have the origins on posterior tubercles of posterior arches of C1 & C2?
- rectus capitis posterior minor (C1)
- obliquus capitis inferior (C2)
What nerves distributes into all muscles of the suboccipital triangle?
- suboccipital
What is the superior/medial attachment for the SCM?
Lateral surface of mastoid process of temporal bone & lateral half of superior nuchal line
What is the main action of the platysma?
Draws corners of mouth inferiorly & widens it as in expressions of sadness/fright
What makes up the floor of the suboccipital triangle?
- posterior arch of vertebra C1
What muscle has the insertion at the transverse processes of vertebra C1?
Obliquus capitis inferior
What is the course for the greater occipital nerve?
- Emerges inferior to obliquus capitis inferior & ascends to posterior scalp
What is one of the actions for bilateral contraction of the SCM?
- Extends neck at atlanto-occipital joint
- Flexes cervical vertebrae so chin approaches manubrium
- Extends superior cervical vertebrae while flexing inferior vertebrae
What is the inferior/lateral attachment of the trapezius?
Lateral third of clavicle/spine of scapula