Write short note on the anatomy of the posterior triangle of the neck.

Definition: the posterior triangle of the neck is formed by
the sternocleidomastoid trapezius muscles and the clavicle.

Boundaries:

Anterior boundry: is formed by the posterior boarder of the sternocleidomastoid
muscle.

Posterior boundary: this is formed by the anterior border of
the trapezius muscle.

Base: formed by the middle one third of the clavicle

Apex: this is formed where the anterior border of trapezius
and the posterior boarder of the sternocleidomastoid muscle meet on the
occipital bone of the skull.

Roof: this is formed by deep fascia of the neck which cover
the space between trapezius and sternocleidomastoid.

Floor: the floor is formed from the superior to the inferior
by splenius capitis, levator scapulae, scalenus medius and posterior muscles. These
muscles are covered by the prevertebral fascia.

Content:

Veins:

1.      
The external jugular vein

2.      
Subclavian vein

Arteries:

1.      
Third part of subclavian artery

2.      
The thyrocervical trunk

3.      
The suprascapular artery

4.      
The occipital artery.

Nerves:

1.      
The accessory nerves

2.      
The cervical plexus

3.      
The phrenic nerves.

Lymph nodes: the superficial and deep groups of cervical
lymph nodes.