Posterior Triangle

Anterior Triangle Mandibl

e

Median Plane

Sternocleidomastoid

Omohyoid (superior

belly)

Sternocleidomastoid

Median plane

Contents: Infrahyoid mm Cricothryoid m Thyroid gland Parathyroid

gland

Thyroid Cartilage Thyrohyoid

membrane Cricoid Cartilage

Cricothyroid ligament

Thyrohyoid Membrane

Thyroid Cartilage

Cricoid Cartilage

Laryngeal Prominence

Superior Horn

Inferior HornOblique

line

Cricothyroid ligament

Omohyoid Superior Belly Inferior Belly

Sternohyoid Sternohyoid

Omohyoid

Fascial sling of omohyoid

Sternothyroid Thyrohyoid Sternohyoi

d

OmohyoidSternothyroid

Thyrohyoid

External Laryngeal N.

Cricothyroid

Variation Pyramidal lobe

Vasculature Superior Thyroid A Inferior Thyroid A Thyroid Ima

(occassionally)

Superior Thyroid

A

Inferior Thyroid A

Considerations Thyroid Ima A Recurrent Laryngeal

NN

Thyroid Ima

A

Recurrent Laryngeal N

Parathyroid Glands

The Center for Advanced Head and Neck Surgery. http://www.waent.org/archives/2009/vol2-1/parathyroid/parathyroid.htm

Recurrent Recurrent

Digastric Anterior Belly Posterior Belly

Stylohyoid Mylohyoid Geniohyoid

Digastric (ant)

Mylohyoid

Stylohyoid

Digastric (ant)

Stylothyoid

Digastric (post)

Digastric (post)

Geniohyoid

Sternocleidomastoid

Omohyoid (superior

belly)

Digastric (posterior belly) Contents:

Common Carotid A.

Internal Carotid A. External Carotid A.

Branches Internal Jugular V. Hypoglossal N. Vagus N.

(branches) Parts of Cervical

Plexus

Bifurcation Branches

Superior Thyroid A. Superior Laryngeal A.

Lingual A. Facial A. Ascending Pharyngeal A. Occipital A. Others:

Maxillary A. Superficial Temporal A. Posterior Auricular A.

Subclavian A.

Common Carotid A.

Superior Thyroid A.

Lingual A.

Occipital A.

Ascending Pharyngeal A.Facial A.

Investing Fascia

Pretracheal Fascia Prevertebral Fascia

Carotid Sheath

Carotid Sheath Internal Jugular V. Vagus N. Common Carotid A.

Then, Internal Carotid A

Sternocleidomastoid (cut)

Carotid Sheath

VPR C1-C4 Phrenic nerve Cutaneous branches* already seen in the posterior

triangle

Muscular branches

Fig 8.11 Clinically Oriented Anatomy 5th Ed. Moore & Dalley

. Ansa cervicalis

Superior root (C1) Inferior root (C2,3)

N. to thyrohyoid

Hypoglossal N (CN XII)

VPR C1

Nerve to Thyrohyoid

Superior root of Ansa Cervicalis

Inferior root of Ansa Cervicalis

Phrenic N

C2

C3

Phrenic N Unnamed nerves

prevertebral mm.

N. to thyrohyoid Ansa cervicalis

Superior root Inferior root

Fig 7.8, Grant’s Dissector 14th Ed.

Mandible

Digastric(Post. Belly)

Digastric(Ant. Belly)

Contents: Submandibular

gland Facial A. & V. Stylohyoid M. Lymph Nodes Hypoglossal N

(portion)

Hypoglossal N (CN XII)

Digastric (Ant. Bellies)

Hyoid

Contents: Submental

Lymph Nodes