Movable muscular fold of mucous membrane suspended from posterior border of hard palate. Separates nasopharynx from oropharynx — “traffic controller” at crossroads of food + air passages.

Surfaces and Borders

• Anterior (oral) surface — concave; median raphe
• Posterior surface — convex; continuous with nasal cavity floor
• Inferior border — free; bounds pharyngeal isthmus; uvula hangs from middle

Palatine Arches and Uvula

• Uvula — conical projection from middle of free inferior border
• Palatoglossal arch (anterior pillar of fauces) — palatoglossus muscle; reaches side of tongue; forms lateral boundary of oropharyngeal isthmus (isthmus of fauces)
• Palatopharyngeal arch (posterior pillar of fauces) — palatopharyngeus muscle; forms posterior boundary of tonsillar fossa; merges with lateral pharynx wall

Structure

• Fibrous basis = palatine aponeurosis (flattened tendon of tensor veli palatini)
• Levator veli palatini + palatopharyngeus: superior surface of aponeurosis
• Palatoglossus: inferior (anterior) surface of aponeurosis
• Numerous mucous glands + some taste buds in mucosa

Muscles of Soft Palate

Motor to all muscles except tensor veli palatini = pharyngeal plexus (cranial root of accessory nerve via vagus) Tensor veli palatini = V3 (nerve to medial pterygoid) — derived from 1st pharyngeal arch

Nerve Supply

General sensory: middle + posterior lesser palatine nerves (V2 via pterygopalatine ganglion); glossopharyngeal nerve

Special sensory (taste): lesser palatine nerves → greater petrosal nerve → geniculate ganglion → nucleus of tractus solitarius

Secretomotor: superior salivatory nucleus → greater petrosal nerve → nerve of pterygoid canal (Vidian’s nerve) → pterygopalatine ganglion (no relay) → lesser palatine nerves → soft palate

Passavant’s Ridge

• Some upper palatopharyngeus fibres pass circularly deep to pharyngeal mucosa → Passavant’s muscle → on contraction raises Passavant’s ridge on posterior nasopharynx wall
• Elevated soft palate contacts this ridge → closes pharyngeal isthmus (separates nasopharynx from oropharynx)

Functions

1. Separates oropharynx from nasopharynx during swallowing (via Passavant’s ridge contact) — prevents food entering nose
2. Controls upper airway + upper food way
3. Modifies voice quality; enables pronunciation of consonants
4. During sneezing: divides air blast through nasal + oral cavities; during coughing: directs air + sputum into mouth

Blood Supply

• Greater palatine branch of maxillary artery
• Ascending palatine branch of facial artery
• Palatine branch of ascending pharyngeal artery

Lymphatics: Upper deep cervical nodes + partly retropharyngeal nodes

Applied Anatomy

• Cleft palate — failure of fusion of palatine processes; Passavant’s muscle best developed in cleft palate → compensatory velopharyngeal closure during swallowing + speech

The soft palate is a movable, muscular fold of mucous membrane suspended from the posterior border of the hard palate. It separates the nasopharynx from the oropharynx and acts as a “traffic controller” at the crossroads between the food and air passages.

Surfaces and Borders

• Anterior (oral) surface — concave, marked by a median raphe.
• Posterior surface — convex, continuous superiorly with the floor of the nasal cavity.
• Superior border — attached to the posterior border of the hard palate, blending on each side with the pharynx.
• Inferior border — free, and bounds the pharyngeal isthmus.

Uvula and Palatine Arches

From the middle of the free inferior border hangs a conical projection, the uvula. From each side of the base of the uvula, two curved mucosal folds extend laterally and downward:

• Palatoglossal arch (anterior pillar of fauces) — contains the palatoglossus muscle, reaches the side of the tongue at the junction of its oral and pharyngeal parts. Forms the lateral boundary of the oropharyngeal isthmus (isthmus of fauces).
• Palatopharyngeal arch (posterior pillar of fauces) — contains the palatopharyngeus muscle. Forms the posterior boundary of the tonsillar fossa and merges inferiorly with the lateral wall of the pharynx.

Structure

The fibrous basis of the soft palate is the palatine aponeurosis, the flattened tendon of the tensor veli palatini. Near the median plane, the aponeurosis splits to enclose the musculus uvulae.

• Levator veli palatini and palatopharyngeus lie on the superior surface of the palatine aponeurosis.
• Palatoglossus lies on the inferior (anterior) surface of the palatine aponeurosis.
• Numerous mucous glands and some taste buds are present in the mucosa.

Muscles of the Soft Palate

Nerve Supply

General sensory fibres are derived from:

• Middle and posterior lesser palatine nerves (branches of the maxillary nerve via the pterygopalatine ganglion).
• The glossopharyngeal nerve.

Special sensory (gustatory) fibres carrying taste sensation from the oral surface travel in the lesser palatine nerves, then through the greater petrosal nerve to the geniculate ganglion of the facial nerve, and onward to the nucleus of the tractus solitarius.

Secretomotor fibres are also contained in the lesser palatine nerves, derived from the superior salivatory nucleus, travelling via the greater petrosal nerve.

Taste from soft palate                Secretomotor to soft palate
        │                                       │
Lesser palatine nerves         Superior salivatory nucleus
        │                                       │
Greater petrosal nerve         Greater petrosal nerve
        │                                       │
Geniculate ganglion              Geniculate ganglion
        │                          (pseudounipolar neuron)
Nucleus of tractus solitarius             │
                                  Nerve of pterygoid canal
                                       (Vidian's nerve)
                                           │
                              Deep petrosal nerve joins here
                                           │
                          Pterygopalatine ganglion (no relay)
                                           │
                                  Lesser palatine nerves
                                           │
                                      Soft palate

Motor supply to all muscles of the soft palate except tensor veli palatini is via the pharyngeal plexus (cranial root of accessory nerve via vagus, through the pharyngeal branch of the vagus). Tensor veli palatini is supplied by the mandibular nerve (nerve to medial pterygoid, a branch of CN V3) — being derived from the first pharyngeal arch.

Passavant’s Ridge

Some upper fibres of palatopharyngeus pass circularly deep to the pharyngeal mucous membrane, forming a sphincter internal to the superior constrictor — these fibres constitute Passavant’s muscle. On contraction, this raises Passavant’s ridge on the posterior wall of the nasopharynx. When the soft palate is elevated, it contacts this ridge, and together they close the pharyngeal isthmus between the nasopharynx and oropharynx.

Movements and Functions of the Soft Palate

1. Controls the upper airway (pharyngeal isthmus) and upper food way (oropharyngeal isthmus) — acting as a gateway between the two passages.
2. Separates the oropharynx from the nasopharynx by locking against Passavant’s ridge during the second stage of swallowing, preventing food from entering the nose.
3. By varying the degree of closure of the pharyngeal isthmus, modifies the quality of voice and enables correct pronunciation of various consonants.
4. During sneezing, appropriately divides and directs the blast of air through the nasal and oral cavities without damaging the narrow nose; similarly during coughing, directs air and sputum into the mouth rather than the nose.

Blood Supply and Lymphatic Drainage

Arteries:

• Greater palatine branch of the maxillary artery.
• Ascending palatine branch of the facial artery.
• Palatine branch of the ascending pharyngeal artery.

Veins: Drain into the pterygoid and tonsillar venous plexuses.

Lymphatics: Drain mostly to the upper deep cervical lymph nodes, partly to the retropharyngeal nodes.

Clinical Correlation

Cleft Palate: A congenital defect resulting from failure of fusion of the palatine processes during development. In cases of cleft palate, Passavant’s muscle is best developed, as its contraction compensates to some extent for the structural deficiency in the palate, helping achieve velopharyngeal closure during swallowing and speech.

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