Salivary glands Glands that secrete saliva - PowerPoint Presentation

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Salivary glands

Glands that secrete saliva

Three major pairs of salivary glands

Parotid gland- mainly serous acini,

Submandibular

gland- mixed acini,

Sublingual gland- mainly mucous acini

and hundreds of minor salivary glands in humans.

 parotid glands

Located near ear in parotid

fossa

Shape – inverted pyramid

Weight- 25-30 gm

Capsule- investing layer of deep cervical fascia

Superficial layer

Deep layer-

stylomandibular ligament

Structure

Base or superior surface

Apex

Lateral surface or superficial surface

anteromedial

surface

posteromedial

surface

Anterior border

Posterior border

medial border

Strucrures

within the gland

Facial nerve

External carotid artery

Retromandibular

vein

Duct of gland

stensons

duct

Thick walled

5 cm long

Opens into vestibule of mouth

opposite crown

of 2

nd

upper molar tooth

Arterial supply

Small branches from

External carotid artery

Superficial temporal artery

Maxillary artery

venous drainage

Retromandibular

vein

External jugular vein

Lymphatic drainage

Deep cervical nodes through

Superficial parotid nodes

Deep parotid nodes

i

Nerve supply

Parasympathetic-

secretomotor

-produces thin watery saliva

Preganglionic

fibres

Inferior

salivatory

nucleus-

glossopharyngeal

nerve-tympanic branch of

glossopharyngeal

nerve-tympanic plexus-

lessor

petrosal

nerve-

otic

ganglion

Postganglionic

fibres

Auriculotemporal

nerve- its parotid branches –parotid gland

sympathetic- vasoconstrictor and reduce secretion

Cervical

ganglia-external carotid nerve plexus-parotid gland

Sensory

– great auricular and

auriculotemporal

nerves

Applied aspect

Parotid swellings- mumps

Parotid abscess

Parotiditis

-very painful, referred to

Auricle

External acoustic

meatus

Tumours

Benign

malignant

Facial palsy

Sialography

-

sialogram

Submandibular gland

Walnut shaped

Weight- 10-20 g

location- partly below and partly deep to body of mandible

Parts- superficial and deep parts

seperated

by

myelohoid

muscle

Submandibular

duct- Wharton's duct

7 cm long

From superficial part-sublingual papillae

Arterial supply- facial and lingual arteries

venous drainage- internal jugular vein

lymphatic drainage-

submandibular

lymph nodes to deep cervical lymph nodes (

jugulo-omohyoid

nodes)

Nerve supply

Parasympathetic-for watery secretion

Preganglionic

fibres

. Superior

salivatory

nucleus-facial nerve-

chorda

tympanic branch of facial nerve-lingual nerve-

submandibular

ganglion

Post

ganglionic

fibres

- cells of

ganglionic-submandibular

gland

sympathetic-for mucous secretion

Post

ganglionic

fibres

from superior cervical ganglion-sympathetic plexus around facial artery-

submandibular

ganglion-

submandibular

gland

Applied aspect

Calculus in duct

sialography

Sublingual gland

Smallest

Almond shaped

3-4 gm in weight

Location- anterior part of oral cavity

Arterial supply – sublingual and

submental

arteries

venous drainage- internal jugular vein

lymphatic drainage-

submental

and

submandibular

lymph nodes to deep cervical lymph nodes (

jugulo-omohyoid

nodes)

Nerve supply- same as that of

submandibular

gland