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Anterior TriangleAnterior Triangleof The Neckof The Neck
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Anterior TriangleAnterior Triangle
Boundaries
Ant.:
Imaginary Midline
(mid-sagittal line)
Post.:
ant. border of SCM
Sup.:
inf. border of the mandible
Inf. apex:ant. & post. meet together
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Roof:
Skin
Superficial Fascia:
platysma
cervical facial n.
transverse cervical n.
ant. Jugular v.
Deep Fascia:
investing layer
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Subdivisions of Ant. TriangleSubdivisions of Ant. Triangle
By:
digastric m. (both bellies)
sup. Belly of omohyoid m.
4 Triangles:Submental
Submandibular (Digastric)
Carotid
Muscular
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Submental TriangleSubmental Triangle
* One unpaired triangleBoundaries
Lat. Sides:
2 ant. bellies of digastric
Base:body of hyoid bone
Apex:
symphysis menti
Floor:
mylohyoid muscle
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Contents
Small veins Ant. Jugular v.
Submental L.N. (2)
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Submandibular TriangleSubmandibular Triangle
Boundaries
Anteromedial:
ant. belly of digastric
Anterolateral:
lower border of mandible
Posterior:
post. belly of digastric
& stylohyoid m.
Floor:
mylohyoid & hyoglossus m.
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Contents
1. Superficial part ofsubmandibular gland
2. Facial a. & v.:
deep to the gland
3. Hypoglossal n.:
deep to the gland
on hyoglossus m.
4. n. To mylohyoid:
between ? & ?
5. Submandibular L.N.
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Submandibular GlandSubmandibular Gland
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Carotid TriangleCarotid Triangle
BoundariesSup.:
post. belly of digastric
Antero-inferiorly:
sup. Belly of omohyoid
Post.:
ant. border of SCM
Floor:
part of hyoglossus
part of thyrohyoid m.
middle & inf. costrictors
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Contents
Carotid sheath contents (4?)
Ansa Cervicalis
ant. aspect of the sheath
Cervical Sympathetic chain
post. aspect of the sheath
Hypoglossal n. (part)
ECA & some of its branches
mainly ant. branches
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Ansa CervicalisAnsa Cervicalis
Loop of cervical spinal nerves
of C1, C2 & C3
That supply:
infrahyoid muscles Except?
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Common Carotid Artery (CCA)Common Carotid Artery (CCA)
Starts:
Rt.? & Lf.?
Ascends in carotid sheath
(most medial)
Sup. Border of thyroid cartilage
(IV disc of C3-C4)
Divides into ICA & ECA
* No branches from CCA
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Carotid SinusCarotid Sinus
Localized dilatation in terminal
CCA & beginning ICA
That contains many n. endings
from IX
Fxn.:
mechanoreceptor
(pressoreceptor)
* Monitors bld. pressure
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Carotid BodyCarotid Body
A small str. Lies post. or at the
bifurcation area of CCA into
ICA & ECA
Fxn.:chemoreceptoe
* Monitors O2 level in bld.
Innervation:
carotid branch of IX
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ECAECA
* Extent?
Branches (8):
Medially (1)
Ant. (3)
Post. (2)
Terminations (2)
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Muscular TriangleMuscular Triangle
Boundaries
Ant.:
midline of the neck
Supero-posterior:
sup. Belly of omohyoid
Infero-posterior:
SCM
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Contents:
Infra hyoid Muscles
Thyroid gland
Larynx & trachea
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Thyroid GlandThyroid Gland
2 Lobes (C5-T1)
&
isthmus
(2nd & 3rd tracheal rings)
Covered by pretracheal layer
Of deep cervical fascia
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Thyroid RelationsThyroid Relations
Anterolateral:
sup. Belly of omo. (upper)
ant. border of SCM (lower)
sternohyoid & sternothyroid
muscles (middle)
Medial:
thyroid & cricoid cartilages(upper)
upper 6 tracheal rings (lower)
Posterior:
CCA
inf. thyroid a.
parathyroid glands
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Vasculature of Thyroid GlandVasculature of Thyroid Gland
Read your text for detailed
arterial bld. Supply & venous
drainage of the thyroid gland
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