Anterior triangle OF NECK Anterior Median plane of
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Anterior triangle OF NECK
• Anterior - Median plane of the neck. • Posterior - Sterno cleidomastoid. • Base- Mandible + Line from angle to mastoid process. • Apex Suprasternal notch • Roof- Skin , superficial Fascia +, Platysma, deep fascia. Boundaries
Subdivisions Submental Digastric Carotid Muscular
• Boundaries Ø Anterosuperior Ø Anteroinferior Ø Posterior Ø Floor Ø Roof Carotid triangle
• Common carotid artery and its bifurcation • External carotid artery and its branches • Carotid sheath with its contents. • Spinal accessory nerve • Hypoglossal nerve • Jugulo-digastric and juguloomohyoid lymph nodes Contents
Applied aspects • Carotid pulse: Pulse palpated just lateral to the upper margin of thyroid cartilage • Carotid sinus syndrome: syncope and slowing of heart rate. • Potato tumor: enlargement of the carotid body. Pressure on carotid sinus.
Muscular triangle
Boundaries: FIn Front: anterior median line of neck hyoid bone – suprasternal notch. FBehind & above: superior belly of omohyoid. FBehind & below: anterior border of sternocleidomastoid FFloor and contents: infrahyoid muscles.
Infrahyoid muscles
Infrahyoid muscles • 1)Sternohyoid • Origin-Posterior surface of manubrium sterni and clavicle. • Insertion-Lower border of hyoid bone. • Nerve supply-Ansa cervicalis. • Action-Depresses the hyoid bone after its elevation during swallowing and during vocal movements.
• 2)Sternothyroid • Origin-Posterior surface of manubrium sterni and adjoining parts of first costal cartilage. • Insertion • Oblique line of lamina of thyroid cartilage. • Nerve supply-Ansa cervicalis. • Actions-Depresses the larynx , after its elevation in swallowing and its vocal movements.
• 3)Thyrohyoid • Origin-Oblique line of thyroid cartilage. • Insertion-Lower border of body and greater cornua of the hyoid bone. • Nerve supply-C 1 through hypoglossal nerve. • Actions-Depresses the hyoid bone. • Elevates the larynx when the hyoid bone is fixed by the suprahyoid muscles.
• 4)Omohyoid • Origin-Inferior belly • Upper border of scapula near the medial side of the suprascapular notch and adjoining suprascapular ligament. • Insertion-Superior belly • Lower border of body of hyoid bone lateral to the sternohyoid muscle.
• Nerve supply • Superior belly by the superior root of the ansa cervicalis and inferior belly by nerve loop of ansa cervicalis. • Actions • Depresses the hyoid bone following its elevation during swallowing and in vocal movements.
Infrahyoid muscles
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