38. Posterior triangle of the neck Flashcards
Anterior border of posterior triangle?
Posterior border of SCM
Posterior border of posterior triangle?
Anterior border of trapezius
Base of posterior triangle?
Clavicle
Name the: Vein Nerves Lymph nodes In the posterior triangle?
EJV
Brachial plexus roots
Accessory nerve
Cervical lymph nodes
Supraclavicular lymph nodes
*Make sure you know the cutaneous innervation of the head and neck**
Slide 7
Which muscles in the posterior triangle does the phrenic nerve cross?
Anterior scalene
In the posterior triangle, between which 2 muscles do the roots of the brachial plexus pass?
Middle scalene
Anterior scalene
Innervation of SCM?
Motor - spinal accessory CN XII
Pain and proprioception - C2, C3
Actions of trapezius?
Ascending part - depress scapula
Transverse - retract scapula
Descending - elevate scapula, rotate glenoid cavity
Innervation of trapezius?
Spinal accessory CNXI
C2, C3
Which 2 muscles form the floor of the posterior triangle of the neck?
Omohyoid
Splenius capitis
Action of omohyoid?
Depress hyoid
Innervation of omohyoid?
Ansa cervicalis
Action of splenius capitis?
Extend and rotate neck
Innervation of splenius capitis?
Dorsal rami middle cervical
Origin of levator scapulae?
Transverse processes of atlas, axis, 3rd, 4th vertebrae
Insertion of levator scapulae?
Medial scapular border between superior angle and medial end of scapular spine
Action of levator scapulae?
Control scapular position
Elevate shoulder
Innervation of levator scapulae?
C3, C4, C5 via dorsal scapular nerve
Origins of the scalenes?
Transverse processes of:
C3 - C6 (ant)
C2 - C7 (middle)
C4 - C6 (post)
Insertion of scalenes?
Ribs 1 and 2
Innervation of scalenes?
Middle - anterior rami C3 - 7
Anterior - C4-7
Posterior - C5 - 7
Action of scalenes?
Flex neck
Tilt head to same side
Elevate upper ribs
