Muscular Triangle
Describe the Parathyroid Gland.
2 to 6 Parathyroid Glands Located on the posterior surface of the Thyroid Gland Located between the capsule and sheath of Thyroid Gland
# of Infrahyoid (strap) Muscles?
4
Location of the Location of the Inferior Thyroid Artery?
Can be seen deep to the inferior edge of the lateral lobes
What is a Pyramidal Lobe? 68
Can often be found extending superiorly from the left lobe of the Thyroid Gland
Surroundings of the Thyroid Gland - Lateral
Carotid Sheath
Significance of the Parathyroid Gland?
Essential for life
Origin of the Superior Thyroid Artery? Course?
External Carotid Artery Courses deep to the Strap Muscles
Describe these muscles
Form a single, almost vertical plane of fibers
Where do the 4 Infrahyoid Muscles derive their names?
From their bony or cartilaginous attachments
Attachments of the Infrahyoid Muscles superiorly?
Hyoid Bone Thyroid Cartilage
Superior to inferior, name the bony or cartilaginous structures located in the anterior midline of the neck.
Hyoid Bone Thyroid Cartilage Cricoid Cartilage Trachea
What carries these nerve fibers to the Thyrohyoid Muscle?
Hypoglossal Cranial Nerve
What is superficial to the Sternothyroid Muscle?
Inferior part of the Sternohyoid Muscle
In general, what is located in the Muscular Triangle?
Infrahyoid (strap) Muscles Thyroid Gland Parathyroid Gland
Surroundings of the Thyroid Gland - Anterior
Infrahyoid Strap Muscles
What connects the lateral lobes of the Thyroid Gland? Where?
Isthmus Crosses midline at the 2, 3, and 4 Tracheal Rings
Function of Infrahyoid Muscles?
**** Movements of the Hyoid Bone Swallowing, Phonation, and Movements of the tongue
Describe the Thyroid Gland's lateral lobes. 68
Ascend superiorly to the oblique line of the thyroid cartilage (deep to insertion of the Sternothyroid Muscle)
Origin of the Inferior Thyroid Artery?
Branch of Thyrocervical Trunk of Subclavian Artery
What innervates these two superficial Infrahyoid muscles?
Branches of the Ansa Cervicalis
What makes up the Nerve to Thyrohyoid Muscle?
C1 and C2 Cervical Nerves
Describe the Omohyoid Muscle's inferior attachment.
Deep to the Sternocleidomastoid Muscle, superior belly of the Omohyoid Muscle is attached to the clavicle by a fascial sling
Location of the Thyroid Gland in relation to these muscles?
Deep to the Sternothyroid Muscle
Path of the inferior belly of the Omohyoid Muscle. Insertion?
Descends across the Posterior Triangle to attach to the superior border of the Scapula (Medial to the Scapular Notch)
These 4 Infrahyoid Muscles lie ventral to what structures?
Larynx, Trachea, and Thyroid Gland
Describe the Omohyoid Muscle.
Lateral to the Sternohyoid Muscle 2 Bellies (Superior and Inferior)
Describe the Sternohyoid Muscle related to other muscles.
Medial to Omohyoid Muscle Narrow, almost vertical in orientation
How far can the lateral lobes of the Thyroid Gland descend?
Sixth Tracheal Ring
Name the Infrahyoid Muscles that form the superficial muscular plane
Sternohyoid Muscle Omohyoid Muscle
Which muscle is wider?
Sternothyroid Muscle
What forms the deep plane of strap muscles? 24
Sternothyroid Muscle Thyrohyoid Muscle
Name the arterial supply to the Thyroid.
Superior Thyroid Artery Inferior Thyroid Artery
Where do these veins drain? 68
Superior and Middle Thyroid Veins: Internal Jugular Vein Inferior Thyroid Vein: Brachiocephalic Vein
What drains the Thyroid Gland? 68
Superior, Middle, and Infeior Thyroid Veins
What is deep to the Sternothyroid Muscle?
Thyroid Gland
Innervation of these 2 deep muscles of the Muscular Triangle?
Thyrohyoid Muscle: Nerve to Thyrohyoid Muscle Sternothyroid Muscle: Ansa Cervicalis
Surroundings of the Thyroid Gland - Medial 69
Trachea and Recurrent Laryngeal Nerve
