Download POSTEREIOR CERVICAL TRIANGLE

LATERAL CERVICAL
TRIANGLE
Superficial Cervical Fascia

Contains:
Platysma muscle
Superficial veins
Cutaneous nerves
Prevertebral Fascia

Covers:
Muscles of the lateral triangle

Extends:
Around anterior surface of the cervical
vertebrae across anterior midline.
Boundaries of Triangle

Anterior:
Posterior border of the sternocleidomastoid

Posterior:
Anterior border of the trapezius

Inferior:
Clavicle

Moore: Fig. 6.29
Roof of Triangle
Skin
 Superficial layer of deep cervical fascia:

Also called investing fascia.
Splits to enclose:
Trapezius
Sternocleidomastoid
Muscular Floor Triangle

Prevertebral fascia covers muscular floor
consisting of:
Splenius capitis
Levator scapulae
Scalenus posterior
Scalenus medius
Scalenus anterior
Omohyoid
Nerves of Triangle
Lesser occipital (C2)
 Supraclavicular (C3,4)
 Accessory (CN XI):

To trapezius and sternocleidomastoid
Vessels of Triangle
Occipital artery
 Transverse cervical artery
 Subclavian vein:

Crosses first rib

Subclavian artery:
Crosses first rib

External jugular vein
Spinal Accessory Nerve

Spinal root
Arises from C1-C5.
Fibers pass superiorly through foramen
magnum and join cranial root.

Cranial root
Arises from medulla.
Spinal Accessory Nerve
Both roots exit through jugular foramen
and separate.
 Spinal root innervates:

Sternocleidomastoid
Trapezius