L

Gland

Location

Duct

Type of Secretion

Parotid glands

Anterior to and somewhat inferior to the ears between the skin of the cheeks and the masseter muscles

Parotid ducts pass through the buccinator muscles and enter the mouth opposite the upper second molars

Clear, watery serous fluid, rich in amylase

Submandibular glands

In the floor of the mouth on the inside surface of the mandible

Ducts open inferior to the tongue near the frenulum

Primarily serous fluid but with some mucus; more viscous than parotid secretion

Sublingual glands

In the floor of the mouth inferior to the tongue

Many separate ducts

Primarily thick, stringy mucus

Mandible

Superior constriGtor muscles

Mandible

Superior constriGtor muscles

Skull Blood Vessels

Skull

Esophagus

Figure 17.13

Muscles of the pharyngeal wall, posterior view.

Skull

Esophagus

Figure 17.13

Muscles of the pharyngeal wall, posterior view.

which prevents air from entering the esophagus during breathing.

Although the pharyngeal muscles are skeletal muscles, they are under voluntary control only in the sense that swallowing (deglutition) can be voluntarily initiated. Complex reflexes control the precise actions of these muscles during swallowing.

Essentials of Human Physiology

Essentials of Human Physiology

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