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Anterior Triangle of the Neck
N/A
16
Anatomy
Professional
07/14/2012

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Cards

Term
What four triangles make up the Anterior triangle of the neck?
Definition
1. Carotid Triangle
2. Submandibular triangle
3. Submental triangle
4. Muscular triangle
Term
What are the boundaries of the Carotid Triangle?
Definition
*Boundaries:
-Superior: Post. Belly of Digastric m.
-Medial: Sup. Belly of Omohyoid m.
-Lateral: SCM
Term
What are the contents of the Carotid Triangle?
Definition
•Carotid Sheath
•External Carotid Artery
•Hypoglossal Nerve (CN XII)
•Deep Cervical Lymph Nodes
•Ansa Cervicalis
Term
What are the boundaries of the Submandibular Triangle?
Definition
*Boundaries:
-Superior: Inferior border of mandible.
-Medial: Anterior belly of digastric m.
-Lateral: Posterior belly of digastric m
Term
What are the contents of the Submandibular triangle?
Definition
•Submandibular Gland
•Facial Artery and Vein
•Hypoglossal Nerve (CN XII)
•Cervical Lymph Nodes
•Nerve to Mylohyoid
Term
What are the boundaries of the Submental Triangle?
Definition
•Superior: Inferior border of mandible.
•Lateral: Anterior belly of digastric m.
•Floor: Mylohyoid m.
Term
What are the contents of the Submental triangle?
Definition
•Anterior Jugular Vein
•Submental Lymph Nodes – very important because the drain the anterior portion of the lower lip and the tongue
Term
What are the boundaries of the Muscular Triangle?
Definition
•Superior: Superior belly of omohyoid m.
•Medial: Midline of neck.
•Lateral: SCM
Term
What are the contents of the Muscular triangle?
Definition
*Infrahyoid Muscles
*Viscera of Neck
Term
Digastric Muscle (OIIA)
Definition
*Origin:
-Posterior belly: mastoid notch
-Anterior belly: digastric fossa of mandible
*Insertion: hyoid bone
*Innervation:
-Posterior belly: facial nerve
-Anterior belly: nerve to mylohyoid (CN V3)
*Action: raise hyoid, depress mandible
Term
Stylohyoid Muscle (OIIA)
Definition
*Origin: Styloid process of temporal bone
*Insertion: Hyoid bone
*Innervation: Facial nerve
*Action: Raise and retract hyoid
Term
Sternohyoid Muscle (OIIA)
Definition
*Origin: manubrium
*Insertion: hyoid
*Innervation: ansa cervicalis
*Action: depress hyoid
Term
Sternothyroid Muslce (OIIA)
Definition
*Origin: manubrium
*Insertion: thyroid cartilage
*Innervation: ansa cervicalis
*Action: depress larynx
Term
Thyrohyoid Muscle (OIIA)
Definition
*Origin: thyroid cartilage
*Insertion: hyoid
*Innervation: C1
*Action: depress hyoid, elevate larynx
Term
Omohyoid Muscle (OIIA)
Definition
*Origin: Superior border of scapula
*Insertion: hyoid, central tendon held clavicle
*Innervation: ansa cervicalis
*Action: depress hyoid
Term
Mylohyoid Muscle (OIIA)
Definition
*Origin: Internal aspect (inside)of mandible
*Insertion: Hyoid bone and median raphe`
*Innervation: Nerve to mylohyoid (CN V3)
*Action: Raise hyoid, depress mandible (open mouth), support tongue
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