Front neck Flashcards
what are the boundaries of the anterior triangle of the neck?
- Medially = line from mandible to sternal notch
- Laterally = Sternocleidomastoid
- Superiorly = mandible
What are the contents of the anterior triangle?
Supra Hyoid Muscles :
- Digastric
- Stylohyoid
- Mylohyoid
- genio hyoid
Infra hyoid muscles :
- Sterno Hyoid
- Omo Hyoid
- Sterno Thyroid
- Thyro hyoid
Vessels:
- common carotid (bifurcation into external and internal)
- Internal Jugular Vein
Nerves:
- Facial
- glossopharyngeal
- vagus
- accessory
- hypoglossal
what is the general function of the infrahyoid muscles?
pulls the hyoid bone downards
What is the nerve supply of the infrahyoid muscles?
Ansa Cervicalis , Anterior rami of C1 - C3 :
- Sternohyoid
- Sternothyroid
- Omo hyoid
Anterior Ramus of C1 carried on the hypoglossal nerve:
- Thyrohyoid
What is the function of digastric muscle?
Opens jaw when masseter and temporalis are relaxed
What is the origin of digastric?
Anterior = digastric fossa on lower mandible Posterior = Mastoid notch on mastoid process
What is the nerve supply of digastric?
Anterior = Trigeminal V3 (mandibular branch) Posterior = Facial
describe the branched of the trigeminal nerve
V1 :
-Opthalmic branch
V2:
-Maxillary branch ——-> Superior Alveolar
V3:
- Mandibular branch ———-> Lingual and Inferior Alveolar
What is the innervation of stylohyoid?
Facial (cervical branch)
what is the innervation of Mylohyoid?
Trigeminal - V3 (mandibular branch —> inferior alveolar —>Mylohyoid nerve )
what is the innervation of geniohyoid?
C1 - anterior ramus (carried on hypoglossal nerve)
what are the contents of the carotid sheath?
- Common carotid
- Internal Jugular
- Vagus nerve
- Last 4 cranial nerves = (glossopharyngeal, vagus, accessory, hypoglossal)
