anatomy ii upnar

8/11/2019 Anatomy II Upnar

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Anatomy II

Head Neck

BY:

DR Yahya Alfarra

CANADIAN BOARD IN DENTISTRY


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Parotid region

arotid gland:: Size :its the largest salivary

gland & its compose of serousacini.

Shape :its wedge shaped ,

Site & extension:it liesbetween the ramus of Md. &SCM

It extends :

Upward:to zygomatic arch

Downward:to angle of Md.

Anteriorly:to cover part ofmasseter ms.

Posteriorly:to overlap SCM


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Parotid duct(stensons duct)

Length : 5 cm long

Beginning : at the

ant. Border of thegland

End: by opening

into the oral cavityopposite the upper2ndmolar tooth


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Opens in the oral cavity

opposite to the second

upper molar tooth.


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Blood supply of P.G

Arterial supply : small branches from ECA

inside the gland

Venous drainage: into retromandibular V.

Lymphatic drainage : into deep & superficial

parotid lymph node

Nerve supply of parotid :Sensory :

great auricualr N. auriculotemporal N.


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Superficial temporal artery


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Temporal region

Temporal fossa

Infratemporal fossa

MuSclE OF mastications


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Temporal fossa

Boundaries :

Sup. Temporal line above

Zygonatic arch.below

Frontal process of zygomaticbone.ant.

Contents(attachments):

2 superficial Ms of mastications

Muscles :

a) temporalis Ms. b) masseter Ms

Nerves :

a ) deep temporal N.b)auriculotemporal N.

Vesseles:superficial temporal A.


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Infratemporal fossa

Boundaries:

Anteriorly: post. Surface of maxilla

Posteriorly : styloid & mastoidprocess

Medially:lateral pterygoid plate

Laterally: coronoid process &ramus of Md.

Contents:

Muscles :2 deep Ms ofMastications

a) medial pterygoid Ms. b ) lateral

pterygoid m.

Nerves:a ) Md. N. b ) chordatympani c ) Mx. N.

Vesseles : a ) Mx. A. b )pterygoid plexus of viens


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Muscles of mastications

Lateral

Pterygoid

Medial

pterygoiod

temporalisMasseter

Arise by 2

head

a)Upper

head(infratem

poral

surfaceofgreater wing

of sphenoid )

b) Lower

head(lat.

Surface of lat.

Pterygoid

plate)

Arise by 2 head

a)superficial

head(Mx.tubero

sity)

b) Deephead(med.

Surface of lat.

Pterygoid

plate)

Floor of

temporal

fossa

?origin

Front of

neck of

Md. &

articular

disc of

T.M.J

Med. Surface of

angle of Md.

?.Lateral

(outer)surface

of ramus of

Md.

Insertion


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Muscles of mastications

Lateral

Pterygoid

Medial

pterygoiod

temporalisMasseter

Depress Md.Elevate Md.Elevate Md.Elevate Md.

To occlude

teeth in

mastication

Action

Anterior

division of

mandibularnerve

?Anterior

division of

mandibularnerve

Anterior

division of

mandibularnerve

Nerve

supply


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Submandibualr region

Definition:its the regoin between Md. & hyoidbone.

It contains :

Muscles:digastric, mylohyoid , hyoglossus,geniohyoid , genioglossus & styloglossus

Salivary gland :submandibualr & sublingual

Nerves :lingual , glossopharyngeal & hyoglossal

Blood vesseles:facial A. & V. , Lingual A. & V.

Parasympathetic ganglion :submandibualr

Lymph nodes :submandibualr group


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Muscles of sumandibualr regionstyloglossusgenioglossushyoglossusgeniohyoidmylohyoiddigastric

Styloidprocess

Uppergenial

tubercle of

Md.

Body ofhyoid

bone

it.s a smallMs lying

deep(above)

to mylohyoid

From genial

tubercle(behi

nd

symphysis

menti of Md.)

MylohyoidMd.

Arise by 2bellies: ant.

Belly:lowerborder of Md.

Close to

symphysis

menti

Post. Belly:medial

surface of

mastoid

process

origin

Whole

length ofside of

tongue

Whole

lengthUnder

surface of

tongue

Inside

tonguedeep to

styloglo

ssus

Upper

surface ofbody of

hyoid

Body of

hyoidbone

Into

intermediate tendon

that

connected

hyoid

bone

insertion

M l f dib l i


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Muscles of sumandibualr regoinstyloglossusgenioglossu

s

hyoglossusgeniohyoidmylohyoiddigastric

Hypoglossal

N.

Hypoglossal

N.

Hypoglossa

-l N.

From C1 via

HypoglossalN.

N. to

mylohyoid abranch of

Inferior

alveolar N.

(from Md. N.)

Ant. Belly :N. to

mylohyoid abranch of Inferior

alveolar N. (from

Md. N. )

Post. Belly:

Facial Nerve

Nerve

supply

Retract

tongue

upward&

backward

Protrude

tongue into

midline

Depress

tongue

*elevate

Hyoid Bone

*depress

Md. If Hyoid

Bone is

Fixed(open

Mouth)

*supportFloor of

mouth

*elevate

Hyoid Bone

*depressMd. If Hyoid

Bone is

Fixed(open

Mouth)

Ant. Belly :

opening Md.

Post. Belly:

Retract hyoid

bone upward&

backward

Action


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alivary gland


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Submandibular gland

Site & extension: It lies belowMd.

It extends to :

Mylohyoid line : a bove

Digastric muscle : below

Mental foramen : anterior

Angle of Md. : posterior

Size:about the size of P.G.

Shape:wedge shape Structure:it consists of 2parts,a large superficial part &a small deep part


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Submandibular duct

Its 5 cm long

Its duct open into

the floor of mouthclose to frenulum of

tongue.


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Blood supply of gland

The arterial supply:the gland is supplied by branchesof facial & lingual A.

The viens drain into facial & lingual V.

Nerve supply :

sympathetic:from plexus arround lingual A.

Parasympathetic:from facial N.


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Sublingual gland

Site:beneath tongue

Size:its the smallest of the 3S.G.

Shape:almond-shaped

Relation :

Ant. : the gland of the oppositeside

Post. : the deep part ofsubmandibualr gland

Med. : genioglossus Ms. ,

lingual N. & submand. DuctLaterally:sublingual fossa of Md.

Sup. : mucous membrane ofmouth(which elevated to formsublingual fold)

Inf. : mylohyoid Ms.


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Sublingual duct :It opens directly in the floor of mouth on sublingualfold

Blood supply :the gland is supplied by

branch of facial & lingual A.The viens drain into facial & lingual V.

Nerve supply :

sympathetic :

from plexus arround lingual A. Parasympathetic:from facial N.


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Nerves OF submandibualr regoin

lingual , glossopharyngeal & hyoglossalN.B. :lingual N. : branch of post. Division of Md. N. in the

infratemporal fossa

Blood vesseles submandibualr regoin:facialA. & V. , Lingual A. & V.N.B.

Facial A.: Branch of ECA

Facial V. :It units ant. Division of retromandibualr V. TO

drain into IJVLingual A. :Branch of ECA

Lingual V. :drain into IJV


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Good luck

anatomy ii upnar

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