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Anatomy Anterior Triangle of the Neck
KYCOM Block 3
92
Anatomy
Graduate
10/12/2012

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Term
what is the anterior boundry of the anterior triangle of the neck
Definition
midline of the neck
Term
what is the posterior boundry of the antrior triangle
Definition
anterior border of the sternocleidomastoid
Term
what is the superior boundry of the anteior triangle
Definition
inferior border of the body of the mandible
Term
wha muscle groups are in the anterior triangle
Definition
infrahyoid, suprahyoid, anterior vertebral
Term
what are the infrahyoid muscles
Definition
sternohyoid, sternothydoid, thyrohyoid, omohyoid
Term
describe the location of the sternohyoid relative to the omohyoid
Definition
superificial and medial to the superior belly of it
Term
what is the origin of the sternohyoid
Definition
posterior surface of the manbrium of the sternum
Term
what is the insertion of the sternohyoid
Definition
body of the hyoid
Term
what innervates the sternohyoid
Definition
asna cervicalis
Term
what is the action of the sternohyoid
Definition
depress hyoid bone
Term
where is the sternothyroid located relative to the sternohyoid
Definition
deep
Term
what is the origin of the sternothyroid
Definition
posterior surface of the manubrium of the sternum
Term
what is the insertion of the sternothryoid
Definition
oblique line of the thryoid cardilage
Term
what innervates the sternothyroid
Definition
ansa cervicalis
Term
what is the action of the sternothryoid
Definition
depresses larynx
Term
where is the thyrohyoid located in relation to the sternothyroid
Definition
upward continuation of it
Term
what is the origin of the thyrohyoid
Definition
oblique line of the thryoid cardilage
Term
what is the insertion of the thryohyoid
Definition
runs superior over the thyroid membrane, inserts into greater horn and body of hyoid
Term
what innervates the thyrohyoid
Definition
C1 fibers via hypoglossal nerve
Term
what is the action of the thyrohyoid
Definition
depress hyoid bond or elevate larynx
Term
what is the ansa cervicalis
Definition
nerve loop with fibers from ventral rami of C1-C3, has a upper and lower root
Term
what is the lower root of the ansa cervicalis made of
Definition
ventral rami of C2-C3
Term
what is the path of the lower root of the ansa cervicalis
Definition
passes superficial to the internal juggular vein, joins upper root to form ansa
Term
what is the upper root of the ansa cervicalis made of
Definition
appears to originate from the hypoglossal nerve but really has fibers from C1 that joined it for a bit
Term
what does the ansa cervicalis supply
Definition
sternohypod, sternothyroid, omohyoid
Term
instead of joining the ansa cervicalis, some fibers continue with CN XII, what do they supply
Definition
thyrohyoid, geniohyoid
Term
what are the suprahyoid muscles
Definition
digastric, stylohyoid, mylohyoid, geniohyoid
Term
what are the parts of the digastric
Definition
posterior and anterior bellies connected by a intermediate tendon
Term
what is the origin and insertion of the posterior belly of the digastric
Definition
digastric notch on the mastoid medial to the mastoid process to the intermediate tendon
Term
what does the intermediate tendon of the digastric attach to
Definition
pierces stylohyoid and runs in fibrous sling connected to body and greater horn of hyoid then becomes continous with anterior belly
Term
what does the anterior belly of the digastric attach to
Definition
intermediate tendon to the digastric fossa of the mandible
Term
what nerve supplies the posterior belly of the digastric
Definition
facial
Term
what nerve supplies the anterior belly of the digastric
Definition
nerve to mylohyoid (branch of the inferior alveolar nerve from V3)
Term
what is the action of the digastric
Definition
depress mandible and elevate hyoid
Term
what is the origin of the stylohyoid
Definition
styloid process
Term
what is the insertion of the stylohyoid
Definition
hyoid bone at junction of body and greater horn
Term
where is the stylohyoid located in relation to the digastric
Definition
it runs along the superior border of the posterior belly
Term
what pierces the stylohyoid, where
Definition
near its insertion by the intermediate tendon of the digastric
Term
what nerve supplies the stylohyoid
Definition
facial
Term
what is the action of the stylohyoid
Definition
elevates the hyoid bone and draws it backwards
Term
where is the mylohyoid located in relation to the digastric
Definition
superior to the anterior belly
Term
what forms the floor of the oral cavity
Definition
the two mylohyoid muscles
Term
what is the origin of the mylohyoid
Definition
mylohyoid line of the mandible
Term
what is the insertion of the myelohyoid
Definition
most posterior fibers attach to the body of the hyoid, the rest of the fibers terminate in the midline raphe extending from mandible to hyoid
Term
what nerve supplies that mylohyoid
Definition
nerve to mylohyoid
Term
what is the action of the mylohyoid
Definition
elevates floor of mouth during swallowing, elevates hoid bone, depresses mandible
Term
where is the geniohyoid located in relation to the mylohyoid
Definition
above it
Term
what is the origin of the geniohyoid
Definition
mental spine
Term
what is the insertion of the geniohyoid
Definition
anteroir surface of the body of the hyoid
Term
what innervates the geniohyoid
Definition
C1 fibers via hypoglossal nerve
Term
what is the action of the mylohyoid
Definition
elevate hyoid bone, draw it forward, depress mandible
Term
what are the anterior vertebral muscles
Definition
longus capitis, longus colli, rectus capitis anterior, rectus capitis lateralis
Term
what is the origin of longus capitis
Definition
transverse process of C3-C6
Term
what is the insertion of longus capitis
Definition
inferior surface of basilar part of occipital bone
Term
what innervates longus capitis
Definition
branches from the ventral rami of C1-C3
Term
what is the action of longus capitis
Definition
flexion of head and neck
Term
what are the parts of longus colli
Definition
inferior oblique, superior oblique, vertical
Term
what is the origin and insertion of the inferior oblique of the longus colli
Definition
bodies of first 2-3 thoracic vertebra to transverse process of C5-C6
Term
what is the origin and insertion of the superior oblique of the longus colli
Definition
extends from the transverse processes of C3-C5 to anterior tubercle of the atlas
Term
what is the origin and insertion of the vertical part of the longus colli
Definition
bodies of upper 3 thoracic and lower 3 cervical vertebra to bodies of C2-C4
Term
what nerve supplies the longus colli
Definition
branches of ventral remi of C2-C6
Term
what is the action of the longus colli
Definition
flexion of neck
Term
where is the rectus capitis anterior located in relation to the longus capitis
Definition
posterior to the upper part
Term
what is the origin of the rectus capitis anterior
Definition
anterior surface of the lateral mass of the atlas and root of its transverse process
Term
what is the insertion of the rectus capitis anterior
Definition
inferior surface of the basilar part of the occipital bone, immediatly anterior to the occipital condyle
Term
what innervates the rectus capitis anterior
Definition
branches from liip between ventral rami of c1-C2
Term
what is the action of the rectus capitis anterior
Definition
flexion of head
Term
what is the origin of the rectus capitis lateralis
Definition
upper surface of the transverse process of the atlas
Term
what is the insertion of the rectus capitis lateralis
Definition
inferior surface of the jugular process of the occipital bone
Term
what innervates the rectus capitis lateralis
Definition
branches from loop between ventral rami of C1-C2
Term
what is the action of the rectus capitis lateralis
Definition
lateral flexion of the head to the same side of the contracting muscle
Term
what are the subdivisions of the anterior triangle
Definition
submandibular (digastric) triangle, carotid triangle, muscular triangle, submental triangle
Term
what is the anterior boundry of the submandibular triangle
Definition
anterior belly of the digastric
Term
what is the posterior boundry of the submandibular triangle
Definition
posterior belly of the digastric and stylohyoid
Term
what is the superior boundry of the submandibular triangle
Definition
inferior border of the body of the mandible
Term
what forms the floor of the submandibular triangle
Definition
mylohyoid and hyglossus
Term
what are the contents of the submandibular triangle
Definition
submandibular gland, facial vessels, submandibular lymph nodes, hypoglossal nerve, mylohyoid nerve and vessels
Term
what is the anterior and superior boundry of the carotid triangle
Definition
posterior belly of the digastric
Term
what is the anterior and inferior boundry of the carotid triangle
Definition
superior belly of the omohyoid
Term
what is the posterior boundry of the carotid triangle
Definition
anterior border of the sternonucleidomastoid
Term
what are the arteries in the carotid triangle
Definition
common carotid, initial segment of external and internal carotid, some branches of the external carotid
Term
what are the veins in the carotid triangle
Definition
internal juggular, some of its tributaries
Term
what are the nerves in the carotid triangle
Definition
vagus, accessory, hypoglossal, ansa cervicalis, internal and external laryngeal
Term
what lymph nodes are in the carotid triangle
Definition
deep cervical
Term
what is the anterior boundry of the muscular triangle
Definition
anterior midline of the neck
Term
what is the posterior and superior boundry of the muscular triangle
Definition
superior belly of the omohyoid
Term
what is the posterior and inferior boundry of the muscular triangle
Definition
anterior border of the sternonucleidomastoid
Term
what are the contents of the muscular triangle
Definition
sternohyoid and sternothryoid muscles, viscera of the neck (thyroid and parathryoid glands, larynx, trachea)
Term
what is the lateral boundry of the submental triangle
Definition
anterior bellies of the digastric muscles
Term
what is the inferior boundry of the submental triangle
Definition
body of hyoid
Term
what forms the floow of the submental triangle
Definition
mylohyoid muscles
Term
what are the contents of the submental triangle
Definition
submental lymph nodes, small veins that join to form anterior juggular veins
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