posterior triangle updated Flashcards
list of mm in posterior triangle
- scm
- trapezius
- splenius capitis
- anterior, middle, posterior scalene
- omohyoid m (inferior)
action of scm
unilateral: tilt (same) and rotate (opposite)
bilateral: flexion of neck
action of trap
unilateral: tilt (same)
bilateral: extend neck
action of splenius capitis m
unilateral: tilt (same); rotate (same)
bilateral: extend neck
action anterior scalene m
bilateral: flex neck, elevate rib 1
unilateral: flex neck (same)
action middle scalene m
unilateral: flex neck (same)
bilateral: flex neck and elevate rib 1
posterior scalene m action
unilateral: flex neck (same)
bilateral: flex neck and elevate rib 2
subclavian artery is behind which structures and in front of which
behind anterior scalene m and clavicle and subclavian v and phrenic n.
in front of middle scalene m
phrenic n sits on what m
anterior scalene m
what veins drain into EJV
posterior auricular v and posterior branch of retromandibular v
what m does EJV lie upon
scm
cutaneous branches of cervical plexus
- lesser occipital n (C2)
- greater auricular (C2-C3)
- transverse cervical n (C2-C3)
- supraclavicular nn (C3-C4)
lesser occipital n supplies
- skin of neck
- scalp posterior to ear
greater auricular n supplies
- portion of auricle
- scalp posterior to ear
- skin of parotid region
- parotid gland
- skin from angle of mandible to mastoid area
name 2 motor branches of cervical plexus
- phrenic n
- ansa cervicalis
