Triangles Of The Neck Flashcards
Boundaries for Posterior Triangles
In front ~ Post. Border of SCM
Behind ~ Trapezius Muscle
Apex ~ Mastoid Process
Base ~ Clavicle Bone
Posterior Triangles are Divided By
Inferior belly of omohyoid
Into Occipital
and
SupraClavicular/SubClavian Triangle
Posterior Belly Of Digastric Closely accompanied by ___________ Muscle
StyloHyoid Muscle
Anterior Triangles
- Sub Mental Triangle
- Digastric Triangle
- Carotid Triangle
- Muscular Triangle
Floor of Posterior Triangles Made By
Prevertebral Layer of deep cervical fascia
Below the DC Fascia~
Semispinalis Capitis
Splenius Capitis
Levator scapulae
Scalenus - post, medius, ante
Roof of Posterior Triangle Made By
Skin
Superficial fascia
Platysma Muscle
External Jugular Vein
DCF - Investing Layer
Cutaneous branches of cervical plexus (forms roof and content)
Cutaneous Branches of Cervical Plexus
Great auricular nerve
Lesser occipital nerve
Transverse cervical nerve
Supraclavicular nerve
(Forms roof and content of posterior triangle)
Most superficially located content of occipital triangle
Spinal Part of Accessory Nerve
Because it is present b/w the Investing layer (roof) and Prevertebral layer (floor)
Innervates SCM and Trapezius
Nerve from C5 Root of Brachial Plexus
Dorsal Scapular Nerve
Innervates ~
Rhomboid Major
Rhomboid Minor
Contents of Occipital Triangle
Spinal Part of Accessory Nerve
Cutaneous branches of cervical plexus
Proprioceptive fibres from Trapezius-C3, C4
C5 Root of brachial plexus - Dorsal Scapular Nerve
Transverse cervical artery
Occipital artery
Subclavian artery divided into 3 parts by
Scalenus Anterior
Contents of SupraClavicular / SubClavian Triangle
3rd Part of subclavian artery
SupraScapular Artery
Dorsal scapular artery
Subclavian vein
Trunk of Brachial plexus
Long Thoracic Nerve {C5, C6, C7}
SupraScapular Nerve {C5, C6}
Content of SubMental Triangle
SubMental Nodes
Content of Muscular Triangle
Infrahyoid Muscles
Nerve to Mylohyoid Muscle supplies
Mylohyoid And Anterior Belly of Digastric
All 3 are Derivatives of 1st Arch
Nerve to Mylohyoid arising from
Posterior Division Of Mandibular Nerve ~ Inferior Alveolar Nerve ~ Nerve To Mylohyoid
Contents of Digastric Triangle
Superficial part of SubMandibular Gland
Facial artery and vein
Nerve to Mylohyoid
Hypoglossal Nerve (XII) is content of Both Carotid and Digastric Triangle
Boundaries of Carotid Triangle
Above and Front ~
Post. Belly of Digastric
Stylohyoid Muscle
Below and Front ~
Superior Belly of Omohyoid
Behind ~
Anterior Margin of SCM
Structures within Carotid Sheath
Common Carotid Artery
Internal Jugular Vein
Vagus Nerve
CCA Bifurcates at
C3 - C4 (C4 > C5)
Or
Upper Border of Lamina of Thyroid Cartilage
Carotid body situated at
At the level of Bifurcation of CCA
Is yellow pigmented Structure
Acts as Chemoreceptor ~ maintains chemical composition
Fusiform dilation of ICA is called
Carotid Sinus
Acts as Baroreceptor ~ maintains Pressure
Tumor in the Carotid Body leads to
Splaying of ICA and ECA
Which gives an appearance of Lyre ~ Lyre Sign
1st Branch of ECA
Superior Thyroid Artery
Anterior Branches of ECA
Superior Thyroid Artery
Lingual Artery
Facial Artery
Posterior Branches of ECA
Occipital Artery
Posterior Auricular Artery
Thinnest Branch of ECA
Ascending Pharyngeal Artery ~ in medial side
Terminal Branches of ECA
Maxillary Artery
Superficial Temporal Artery
Branches of ECA not present in the Carotid Triangle
Terminal Branches (arises at the level of neck of mandible)
Posterior Auricular Artery
Arteries present in the Carotid Triangle
- CCA
- ECA
- ICA
- Superior Thyroid Artery
- Lingual Artery
- Facial Artery
- Occipital Artery
- Ascending Pharyngeal Artery
Internal Jugular Vein
Contents of Carotid Triangle
5 Nerves;
Vagus Nerve Ansa Cervicalis Cervical Sympathetic Chain Hypoglossal Nerve Spinal Accessory Nerve
1 Vein;
Internal Jugular Vein
8 Arteries;
CCA, ICA, ECA Superior Thyroid Artery Lingual Artery Facial Artery Occipital Artery Ascending Pharyngeal Artery
Floor Muscles of Digastric Triangle
Mylohyoid Muscle
Hyoglossus Muscle
Middle Constrictor Muscle
Middle Constrictor And Hyoglossus forms floor for Carotid and Digastric Triangle
Floor Muscles of Carotid Triangle
Muscles arising from Thyroid Cartilage and Hyoid Bone
Thyrohyoid Muscle
Inferior Constrictor
Middle Constrictor
Hyoglossus Muscle
Boundaries of Suboccipital Triangle
Above and Medially;
Posterior margin of rectus capitis
Above and Laterally;
Oblique capitis superior
Below and Laterally;
Oblique capitis inferior
Floor of SubOccipital Triangle is formed by
Posterior Atlanto-Occipital Membrane
Posterior Arch of Atlas
Contents of SubOccipital Triangle
3rd Part of Vertebral Artery
SubOccipital Nerve ~ Dorsal Rami of C1
