Muscular Triangle

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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


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