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Muscular triangle
Boundaries
• Anteriorly: midline of neck
• Superiorly: superior belly of omohyoid.
• Inferiorly: anterior border of sternomastoid .
Sternohyoid
• Origin :Back of manubrium& medial end of clavicle.
• Insertion :Medial part of the lower border of hyoid bone.
• Nerve supply : AnsaCervicalis
• Action: Depression of hyoid bone
Sternothyroid
• Origin :Back of
manubrium sterni.
• Insertion: Oblique line of
thyroid cartilage.
• Nerve supply : Ansa
cervicalis.
• Action :Depression of the
larynx.
Thyrohyoid
• Origin: Oblique line of the thyroid cartilage.
• Insertion :Lower border of hyoid bone.
• Nerve supply :hypoglossal nerve(C1fibers).
• Action:Depression of hyoid or elevation of larynx.
Ansa Cervicalis
Def It is a loop of cervical nerves which lies on the surface of carotid sheath.
It is formed by the union of:• Descending hypoglossi :consist of fibers from C1.• Descending cervicalis : consist of fibers from C2&C3
Branches:• Sternohyoid
• Sternothyroid
• Omohyoid(both belies)
Carotid Triangle
Boundaries• Superiorly(A) Posterior
belly of digastric
muscle.
• Inferiorly(C) Superior
belly of omohyoid.
• Posteriorly(B) Anterior
border of
sternomastoid.
Roof:• Skin &superficial fascia
• Platysma & deep fascia
Floor:•Thyrohyoid
•Hyoglossus
•Middle& Inferior constrictors of the pharynx.
Contents:1- Internal jagular vein:
descends vertically in the lateral part of the triangle
2-common & internal carotid triangle:both lie medial to the internal jagular vein
3-external carotid artery:it gives 8 branches, 5 of them are given off in the triangle ( superior thyriod, ascending pharyngeal, lingual, facial, occipital)
4-vagus:it descends within the carotid sheath
5- Cervical part of the sympathetic trunk:
Lies behind the carotid sheath
6-Accessory nerve:
runs downwards and backwards either superficial or deep to the internal jagular vein.
7- Hypoglossal nerve:
descends between internal jagular vein and internal carotid artery.
cross the external carotid artery and the loop of the lingual artery.
:عمل الطالب
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بيترايهاب مجدي لبيب-221
بيشوي كمال لبيب توما-222
تسنيم ابراهيم عبد الحليم قنديل أبو طير-223
تسنيم احمد مصطفى احمد خليل الجندي-224
تسنيم محمود محمد عبد الفتاح-225
تقى ابراهيم عطيه عبد الهادي -226
تقى السيد جاد الزيات-227
تقى خالد عبد القادر سعد شعيب -228
تقى محمد صابر الفيومي-229
تهاني جمعة فوزي عبده-230