Wednesday, April 29, 2015

Anterior Triangle of the Neck

Posted by Radiology Madeeasy

Anterior Triangle of the Neck

image

The sternocleidomastoid musc divides the neck into an ant triangle & a post triangle

Boundaries

Anteriorly

ant median line of neck

Posteriorly

ant border of sternocleidomastoid

Superiorly

inf border of mandible & a line drawn from angle of mandible to mastoid process

Inferiorly

the apex of the triangle lies at the manubrium sterni

Subdivision

It is subdivided by the digastric & sup belly of omohyoid into

a. submental

b. digastric

c. carotid

d. muscular triangles

a) Submental Triangle

base

hyoid core

on each side

ant belly of digastric

b) Digastric Triangle

anteroinferiorly

ant belly of digastric

posteroinferiorly

post belly of digastric

superiorly (base)

inf border of mandible

c) Carotid Triangle

anteriorly

sup belly of omohyoid

posteriorly

ant border of sternocleidomastoid

superiorly

post belly of digastric

d) Muscular Triangle

anteriorly

ant median line of neck

posterosuperiorly

sup belly of omohyoid

posteriorinferiorly

ant border of sternocleidomastoid

Roof

The roof is formed by

1. skin

2. fascia

3. platysma

Floor

Triangle

formed by

Submental

mylohyoid muscles

Digastric

1. mylohyoid

2. hyoglossus

Carotid

1. thyrohyoid

2. hyoglossus

3. inf & middle constrictors of pharynx

Muscular

1. sternohyoid

2. sternothyroid

3. thyrohyoid

ie. infrahyoid muscles

Contents

Triangle

Contents

Submental

1. LN

2. veins

Digastric

1. submandibular gld

2. facial art & vein

3. portions of parotid gld

4. ECA

situated more deeply

5. ICA

6. IJV

7. glossopharyngeal n

8. vagus n

Carotid

1. CCA, ECA & ICA (more deeply)

2. branches of ECA

3. IJV & some of its tributaries

4. portions of X, XI & XII cranial n

5. larynx & pharynx

6. int & ext laryngeal n

Muscular

1. thyroid gld

2. trachea & larynx

3. esophagus