Physiology

Efferent Innervation of the Salivary Glands Parasympathetic Innervation

• inferior salivatory nucleus (medulla)—glossopharyngeal nerve (Jacobson's nerve) — lesser (superficial) petrosal nerve — otic ganglion—postganglionic parasympathetic fibers—carried by auriculotemporal branch of CNV3 — parotid gland

Acini Cells

Intercalated Duct

Endoplasmic reticulum

Golgi apparatus

Striated Duct

Endoplasmic reticulum

Golgi apparatus

Myoepithelial cell

Figure 2-3. Schematic drawing of the salivary gland duct system.

Myoepithelial cell

Figure 2-3. Schematic drawing of the salivary gland duct system.

Excretory Duct

• superior salivatory nucleus (pons) — nervus intermedius — chorda tympani—carried on lingual nerve — submandibular ganglion—

postganglionic parasympathetic fibers — submandibular and sublingual glands

Sympathetic Innervation

• superior thoracic nerves — superior cervical ganglion—

postganglionic fibers via arterial plexus — submandibular and cutaneous vessels

Salivation

• Composition: >99% water, salts (calcium phosphate, calcium carbonate), organic compounds and enzymes (amylase, albumin, lysozyme, immunoglobulin A, ptyalin initiates the first phase of starch digestion, others)

• Function of Saliva: antibacterial (contains "secretory piece" needed for IgA, ABO isohemagglutinogens, perioxidases, and other immunological proteins), digestion (provides digestive enzymes and buffers), lubrication and moisturization, dental protection (prevents caries and promotes dental calcification), modulation of taste

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