AT I: Muscular Triangle & Endocrine Glands Flashcards
Describe the boundaries and roof/floor of the anterior triangle
Borders: Inferior border of mandible, anterior border of SCM, midline of neck
Floor: pretracheal fascia
roof: deep investing fascia around muscles
What are the subdivisions of the anterior triangle of the neck?
Submandibular, Submental, muscular, and carotid triangles
What is the attachment, nerve supply and action of the Mylohyoid?
Origin: mylohyoid line on mandible
Insertion: Body of hyoid
Nerve: Trigeminal nerve (CN V3) - nerve to mylohyoid
Action: elevate hyoid & floor of mouth
What is the attachment, nerve supply and action of the anterior belly of digastric?
Origin: Digastric fossa on mandible
Insertion: hyoid
Nerve: Trigeminal nerve (CN V3) - nerve to mylohyoid
Action: raises & opens mouth by lowering mandible
What is the attachment, nerve supply and action of the posterior belly of digastric?
Origin: Mastoid notch
Insertion: hyoid
Nerve: Facial nerve (CN VII)
Action: Elevates & retracts hyoid
what are the functions of the suprahyoid muscles?
elevate the hyoid (for swallowing) and larynx (tone production)
What is the attachment, nerve supply and action of the sternohyoid muscle?
Origin: posterior surface sternoclavicular joint & manubrium
Inserts: body of hyoid
Nerve: Anterior rami of C1-C3 (through ansa cervicalis)
Action: depresses hyoid
What is the attachment, nerve supply and action of the superior omohyoid muscle?
Origin: intermediate tendon
Inserts: hyoid bone laterally
Nerve: Anterior rami of C1-C3 (through ansa cervicalis)
Action: depresses hyoid
What is the attachment, nerve supply and action of the inferior omohyoid muscle?
Origin: superior border of scapula
Inserts: intermediate tendon
Nerve: Anterior rami of C1-C3 (through ansa cervicalis)
Action: depresses hyoid
What is the attachment, nerve supply and action of the thyrohyoid muscle?
Origin: Oblique line on thyroid cartilage
Inserts: greater horn of hyoid
Nerve: anterior rami of C1
Action: depresses hyoid
What is the attachment, nerve supply and action of the sternothyroid muscle?
Origin: Posterior surface of manubrium
Inserts: oblique line on thyroid cartilage
Nerve: Anterior rami of C1-C3 (through ansa cervicalis)
Action: Draws larynx downward
Describe the general structure of the thyroid gland
Has a pyramidal lobe down the middle with a left & right lobe as well, Thyroid gland placed within visceral compartment of neck
what is the arterial supply of the thyroid gland?
Superior thyroid artery - 1st brand of external carotid
Inferior thyroid artery - branch of thyrocervical trunk from subclavian artery
what is the venous drainage of the thyroid gland?
Superior thyroid vein (into IJV)
Middle thyroid vein (into IJV)
Inferior thyroid vein (into brachiocephalic)
Describe the general structure of the parathyroid gland
2 PAIRS (superior & inferior) of small round glands usually POSTERIOR SURFACE of thyroid glands
