Boundaries
What is the anterior boundary?
Posterior border of SCM
What is the muscle that splits the occipital region & omoclavicular triangles?
Omohyoid muscle (inferior belly)
What is another name for this triangle?
Subclavian triangle
Out of the 5 muscles, what 3 have superior attachments to posterior tubercles of transverse processes?
- Levator Scapulae
- Middle Scalene
- Posterior Scalene
Is it true that the anterior scalene is a lateral muscle?
No
What is the floor made up of?
Formed by the muscles
- splenius capitis
- levator scapulae
- middle scalene
- posterior scalene
What important nerve is associated with this triangle?
Spinal accessory nerve
What two arteries are associated with this triangle?
- Suprascapular artery
What is the innervation of the splenius capitis muscle?
Out of the 5 muscles, what 2 are innervated by anterior rami?
- Middle Scalene
- Posterior Scalene
What is the inferior boundary?
inferiorly by clavicle between trapezius & SCM
Is it the internal or external jugular vein that is associated with this triangle?
External jugular vein
What vein is associated with this triangle?
Subclavian vein
What is the main action of the levator scapulae?
Downward rotation of scapula & tilts its glenoid cavity inferiorly by rotating scapula
What is the inferior attachment for the posterior scalene muscle?
External border of 2nd rib
What is the posterior boundary?
What trunk is associated with this triangle?
Cervicodorsal trunk
Is this region superior/inferior to occipital triangle?
Inferior
What is the superior attachment of the rectus capitis lateralis muscle?
What is the innervation for the levator scapulae muscle?
- Dorsal scapular nerve C5
- Cervical spinal nerves C3-C4
What is the apex?
Where SCM & trapezius meet on superior nuchal line of occipital bone
What lymph node is associated with this triangle?
Cervical lymph node
Along with the occipital triangle, this triangle is associated with what region?
What is the superior attachment for the middle scalene muscle?
Posterior tubercle of transverse processes of C5-C7 vertebrae
What is the main action of the splenius capitis muscle?