Neck 2 Flashcards
what is the anterior border of posterior triangle
posterior border of SCM
what is the posterior border of posterior triangle
anterior border of trapezius muscle
what is the inferior border of posterior triangle
superior border of intermediate 1/3 of clavicle
what is the superior border of posterior triangle
meeting of trapezius and SCM at superior nuchal line
what is the roof of posterior border of triangle
skin, superficial fascia, platysma, and investing layer of deep cervical fascia
what is the floor posterior triangle
muscles :
1- semispinals capities
2- splenius capities
3-levator scapulae
4- scalene muscles
origin of platysma muscle
- superficial fascia of deltoid
-pectoral regions
insertion of platysma muscle
- inferior border of mandible
- some fibers sweep upward and blend to risorius
action of platysma muscle
-stretches tightly the skin of the neck
- depresses mandible
what is the nerve supply of platysma muscle
cervical branch of facial nerve
origin of splenius capities muscle
-lower part of ligamentum nuchae
-spinus process of C7-T3
insertion of splenius capities muscle
- mastoid process
- superior nuchal line
action of splenius capities muscle
bilateral: extends the head
individual: flexes the head laterally and rotate the head to same side
nerve supply of splenius capities muscle
cervical spinal nerves 2nd and 3rd
origin of levator scapulae
transverse process of C1 to C4
insertion of levator scapulae
superior portion of vertebral ( medial) border of scapula
action of levator scapulae
elevates and rotates scapula
nerve supply of levator scapulae
dorsal scapular nerves
origin of scalene muscles
transverse process C2 to C7
insertion of scalene muscles
Anterior scalene: 1st rib
Middle scalene : 1st rib ( posterior to anterior scalene )
Posterior scalene : 2nd rib
action of scalene muscles
- flex neck
- elevate the 1st and 2nd ribs
nerve supply of scalene muscles
spinal nerves C3-C8 through cervical and brachial plexus
posterior triangle arteries
occipital a
transverse cervical a
suprascapular a
subclavian a
dorsal scapular a
post triangle veins
occipital v
transverse cervical v
subclavian v 3rd p
suprascapular v
external jugular v
