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Transcript 
ANTERIOR and POSTERIOR
TRIANGLES of NECK
Gross HSB Reviewer
Courtesy of Katherine Joy N. Lumucso 1-A2
FEU-NRMF SY 2005-2006
Anterior Triangle of Neck
Submental
Triangle
Boundaries:
Apex – Mandibular symphysis
bellies of Digastric muscle
Inferior – Body of hyoid bone
Floor – Mylohyoid muscle
Lateral – Right & left anterior
Contents:
Submental lymph nodes
Veins forming Anterior jugular vein
Submandibular
or Digastric
Triangle
Boundaries:
Lateral – Anterior & posterior
bellies of Digastric muscle
(1)
Superior – Inferior border of
mandible (2)
Floor – Mylohyoid muscle
(3), Hyoglossus muscle, and
Middle constrictor of pharynx
1
2
3
Contents:
Submandibular gland & duct
CN XII, Nerve to mylohyoid
Submental artery
Submental lymph nodes
Suprahyoid muscles
Carotid
Triangle
Boundaries:
Superior belly of Omohyoid
muscle (1)
Posterior belly of Digastric
muscle (2)
Anterior border of SCM (3)
Contents:
Carotid sinus
2
Carotid body
3 Carotid sheath (Common
1 carotid artery, CN X, IJV)
Ansa cervicalis (supply
Infrahyoid muscles)
Muscular
Triangle
Boundaries:
Superior belly of Omohyoid
muscle (1)
Anterior midline of the neck (2)
Anterior border of SCM (3)
1
Contents:
2 Infrahyoid muscles
3 (Sternohyoid, Sternothyroid,
Thyrohyoid, Omohyoid)
Viscera of neck (Thyroid
gland, Parathyroid glands,
Larynx)
Suprahyoid
Muscles
Mylohyoid
Digastric (Anterior belly)
Geniohyoid
Digastric (Posterior belly)
Stylohyoid
Infrahyoid
Muscles
Thyrohyoid
Omohyoid (superior belly)
Sternohyoid
Sternothyroid
1
1 : Internal jugular vein
2
2 : Common carotid artery
Carotid
Arteries
External carotid artery
Internal carotid artery
Common carotid artery
1 : Omohyoid (superior belly)
2 : Sternohyoid
3 : SCM (reflected)
3
1
2
2
1
3
1:
With ARROW:
Internal jugular vein
With RED PIN:
Sternohyoid muscle
With RED PIN:
Sternocleidomastoid muscle
With RED PIN:
Right common carotid artery
Posterior Triangle of Neck
Occipital
Triangle
Supraclavicular
Triangle
2
3
11
7a
5
4
6
7b
1
8
9
10
1 : Trapezius
2 : Splenius capitis
3 : Levator scapulae
4 : Scalenus posterior
5 : Scalenus medius
6 : Omohyoid (inf. belly)
7a : SCM (sternal head)
7b : SCM (clavicular head)
8 : Brachial plexus
9 : R. Subclavian artery
10 : R. Subclavian vein
11 : Anterior triangle of neck
1 : Trapezius
2 : Semispinalis capitis
3 : Splenius capitis
4 : Levator scapulae
5 : Scalenus medius
6 : Scalenus anterior
7 : SCM
8 : Parotid gland
9 : Parotid (Stensen’s)
duct
9
8
2
3
7
1
4
5
6
R. Anterior belly of
Digastric
Stylohyoid
R. Posterior belly
of Digastric
Thyrohyoid muscle
Omohyoid (superior
belly)
Sternohyoid
Anterior jugular vein
5
4
6
7
2
1
3
8
10
9
1 : Scalenus anterior
2 : Scalenus medius
3 : Scalenus posterior
4 : Levator scapulae
5 : Splenius capitis
6 : Thyrohyoid
7 : L. Common carotid artery
8 : Brachial plexus
9 : L. Subclavian artery
10 : L. Subclavian vein
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