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7 Cards in this Set

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ANTERIOR TRIANGLE

SUBMENTAL TRIANGLE
-bordered by?
-contents?
5. Submental Triangle

a.Unpaired; bordered by the anterior bellies of the digastric and body of the hyoid

b. Contains submental lymph nodes and veins that coalesce to form the anterior jugular veins; its floor is formed by the medial portions of the mylohyoid muscles.
POSTERIOR TRIANGLE

BOUNDED BY...
1. Bounded by the sterriocleidomastoid, clavicle, and anterior border of trapezius; it is subdivided into the triangles noted below
POSTERIOR TRIANGLE

OCCIPITAL TRIANGLE
-bordered by...
Bordered by the upper part of sternocleidomastoid, the inferior belly of the omohyoid, and the anterior border of trapezius; from superior to inferior, its floor is formed by splenius capitis, levator scapulae, scalenus posterior, and scalenus medius, and their covering vertebral fascia
POSTERIOR TRIANGLE

OCCIPITAL TRIANGLE
-accessory nerve descends...
b. The accessory nerve descends across the triangle on levator scapu.
lae; the nerves to levator scapulae (ventral rami C3 and C4), the dorsal scapular nerve, and the long thoracic nerve may emerge into the triangle through scalenus medius
POSTERIOR TRIANGLE

OCCIPITAL TRIANGLE
-occ. + transverse cervical arteries course...
c. The occipital and transverse cervical arteries course posteriorly in
the superior and inferior regions ofthe triangle, respectively
POSTERIOR TRIANGLE

SUBCLAVIAN TRIANGLE
-bordered by...
3. Subclavian Triangle: bordered by the lower part of sternocleidomastoid,
the inferior belly of the omohyoid, and clavicle; contains the subclavia
artery, brachial plexus, and the lower part of scalenus anterio
STERNOCLEIDOMASTOID

OIAI
Origin- manubriumm of the sternum and sternal end of the clavicle

2. Insertion: mastoid process and lateral part of the superior nuchal line

3. Action: laterally flexes the head and neck and rotates the head and neck
to the opposite side; both muscles acting together flex the head and neck

4. Innervation: accessory nerve