What is Dr. Zubair Khalid's research focus?

Dr. Zubair Khalid specializes in molecular virology, mRNA vaccine development, and computational biology, with a focus on avian pathogens like IBDV and Avian Reovirus.

Where is Dr. Zubair Khalid currently working?

Dr. Zubair Khalid is a Postdoctoral Research Associate at the University of Maryland (UMD), specifically within the Department of Animal and Avian Sciences.

Velum Palate: Soft Palate Anatomy and Function Explained

Name: Velum Palate: Soft Palate Anatomy and Function Explained
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-09-20

The velum palate, also called the soft palate, is a musculoaponeurotic shelf that hangs from the caudal edge of the hard palate and separates the nasopharynx above from the oropharynx below. In domestic mammals it is largely a passive flap that is displaced by pressure changes and by the tongue and larynx during swallowing, rather than a structure that is actively lifted the way the human velum is lifted for speech.

What the Velum Palate Is and Where It Sits

The term velum comes from the Latin for a curtain or veil. The soft palate is a curtain of tissue that hangs down from the back of the hard palate. Its rostral attachment is a firm, fibrous junction with the caudal border of the hard palate, and its caudal border is free, forming the arched edge of the velum.

The two surfaces are different. The dorsal (nasal) surface faces the nasopharynx and is covered by respiratory-type epithelium. The ventral (oral) surface faces the oropharynx and is covered by non-keratinized stratified squamous epithelium. In the goat, the oral mucous membrane of the soft palate is covered by non-keratinized stratified squamous epithelium, and the lamina propria and submucosa contain connective tissue fibers, diffuse and nodular lymphatic tissue, striated muscle fibers, and many mucous and serous palatine glands [1]. The same layered arrangement, with regional variation, applies across domestic species.

The soft palate is one of the boundaries of the pharynx. Rostrally it opens into the nasopharynx and oropharynx, and caudally it continues toward the larynx. The space between the soft palate and the epiglottis, and between the soft palate and the dorsal pharyngeal wall, is the route that air and food must negotiate. That route is controlled by the position of the velum relative to the larynx.

The palatine glands open onto the oral surface. In the goat, scanning electron microscopy shows several rounded openings on the ventral surface occupied by flower-like structures, and these openings are the entrances to the palatine glands [1]. The palatine tonsil is a separate but related structure in the lateral wall of the oropharynx. In the goat the palatine tonsil is large and protrudes from a fossa in the lateral wall of the oropharynx, with two to three elongated irregular openings that lead to well-developed crypts lined by non-keratinized stratified squamous epithelium [1]. In the collared peccary, the soft palate tonsils are a pair separated by a median raphe, and the epithelium is keratinized stratified squamous with orifices associated with lymph nodule organization [2]. These are species variations on a shared theme, not different organs.

The Five Paired Muscles of the Soft Palate

The soft palate contains five paired muscles. Four are named for the structures they connect, and the fifth is the small midline muscle of the uvula. Their arrangement is consistent across mammals, and the mouse soft palate has been used as a model because its four muscles are very similar to their human counterparts in morphology, orientation and attachments [3].

Tensor veli palatini

The tensor veli palatini is the muscle that tenses the palatal aponeurosis. It arises from the region of the pterygoid and the auditory tube and runs downward to a tendon that turns around a pulley-like process, the hamulus of the pterygoid bone, before fanning out into the palatal aponeurosis. The hamulus acts as the anchor point that redirects the tendon's pull. The muscle's innervation by a small branch of the mandibular nerve has been confirmed in all reviewed anatomical studies [4]. Its action is to tense the soft palate and to open the pharyngotympanic (auditory) tube.

Levator veli palatini

The levator veli palatini lifts the soft palate. It arises from the region of the auditory tube and the adjacent part of the skull base and inserts into the palatal aponeurosis. Its innervation is debated. It is probable that the lesser palatine nerve and the pharyngeal plexus dually innervate the levator veli palatini and palatopharyngeus muscles [4]. The lesser palatine nerve enters from the lateral side of the inferior-velar part of the levator veli palatini, while nerves to the superior-extravelar part enter from the lateral side [4]. The lesser palatine nerve also innervates the musculus uvulae, palatopharyngeus, and levator veli palatini [5].

Palatoglossus

The palatoglossus runs in the palatoglossal arch from the soft palate to the tongue. It forms the rostral pillar of the fauces. Its innervation comes from the superior branches of the glossopharyngeal (IX) and vagus (X) nerves, which contribute to the palatoglossus, and the muscle appears to be composed of at least two neuromuscular compartments [5]. Its action is to narrow the oropharyngeal isthmus and to draw the soft palate toward the tongue.

Palatopharyngeus

The palatopharyngeus runs in the palatopharyngeal arch from the soft palate to the pharyngeal wall. It forms the caudal pillar of the fauces. Its middle branches of the glossopharyngeal and vagus nerves innervate it, and like the palatoglossus it appears to be composed of at least two neuromuscular compartments [5]. The muscle has a rostral and a caudal fasciculus in the horse [6]. Its action is to narrow the pharyngeal opening and to shorten the pharynx.

Musculus uvulae

The musculus uvulae is a small midline muscle within the uvula, the caudal projection of the soft palate. It is innervated by the lesser palatine nerve [5]. Its action is to shorten and thicken the uvula, which helps the velum conform to the dorsal pharyngeal wall.

Summary muscle table

Muscle	Origin	Insertion	Innervation	Action
Tensor veli palatini	Pterygoid region and auditory tube	Palatal aponeurosis via hamulus	Mandibular nerve branch (V3) [4]	Tenses soft palate, opens auditory tube
Levator veli palatini	Auditory tube and skull base	Palatal aponeurosis	Lesser palatine nerve and pharyngeal plexus (dual) [4]	Lifts soft palate
Palatoglossus	Soft palate	Tongue	Superior branches of IX and X [5]	Narrows oropharyngeal isthmus
Palatopharyngeus	Soft palate	Pharyngeal wall	Middle branches of IX and X [5]	Narrows pharyngeal opening
Musculus uvulae	Palatal aponeurosis	Uvula	Lesser palatine nerve [5]	Shortens and thickens uvula

The Palatal Aponeurosis and the Hamulus

The palatal aponeurosis is the fibrous sheet that gives the soft palate its structural backbone. The tensor veli palatini tendon hooks around the hamulus and then spreads into this sheet. The hamulus is therefore the mechanical anchor of the whole system. Without it, the tensor could not redirect its line of pull to tense the palate.

The aponeurosis is not just a passive sheet. It is the insertion point for the levator and the origin for parts of the palatopharyngeus and musculus uvulae. Its integrity matters clinically. When the soft palate is shortened surgically, the geometry of this sheet changes, and that is one reason postoperative palatal length and thickness are measured after staphylectomy [7][8].

Innervation of the Soft Palate

The motor innervation of the soft palate comes from the pharyngeal plexus, which receives contributions from the glossopharyngeal (IX) and vagus (X) nerves, and from the lesser palatine nerve. The facial nerve also contributes to the pharyngeal plexus [5]. The plexus divides into a superior part that innervates the palatal and neighboring muscles and an inferior part that innervates the pharyngeal constrictors [5].

The sensory innervation is separate. Nociceptive sensory information from the soft palate, the root of the tongue, and the pharynx is conveyed by neurons in the superior glossopharyngeal ganglion, and about 30% of the retrogradely labeled neurons in that ganglion expressed calcitonin gene-related peptide-like immunoreactivity in a rat study [9]. This matters because the soft palate is a sensory as well as a motor structure, and its sensory nerves can be damaged independently of its motor nerves. In a rat model of chronic intermittent hypoxia, sensory nerves were damaged while motor nerves were not, based on decreased annexin V expression without a change in argin level [10].

Species Differences in Length and Mobility

The soft palate varies in length, mobility and relationship to the larynx across domestic species. These differences explain much of the species-specific disease patterns.

Dog

The dog has a relatively long, mobile soft palate. In brachycephalic breeds the soft palate can be abnormally long and thick, a condition called elongated soft palate, and it is a major component of brachycephalic obstructive airway syndrome (BOAS). Computed tomography in French Bulldogs shows that the soft palate length is measured from the end of the hard palate to the caudal tip, and that after either folded-flap palatoplasty or traditional staphylectomy the palate is significantly shorter and significantly thinner at the rostral and middle thirds but not at the caudal third [7]. A separate study found that shortening the soft palate reduced median length, cross-sectional area and volume after both folded-flap palatoplasty and standard staphylectomy [8].

The dog soft palate is not just a passive flap. It has a palatinus muscle and a levator veli palatini muscle. In healthy Beagles, the palatinus muscle has myofibers of relatively uniform diameter with a random mosaic pattern of type I and II myofibers, while almost all myofibers in the levator veli palatini are type II [11]. In elongated soft palates, small group atrophy, large group atrophy and angular-shaped atrophy appear in the palatinus, and there is a significant increase in atrophic type II myofibers in the levator veli palatini [11]. Myofiber atrophy, hypertrophy, hyalinization and regeneration are found in almost all elongated soft palate specimens, and there are fewer palatine peripheral nerve branches than in controls [12]. These findings suggest a denervation component to the disease, not simply a developmental overgrowth.

Cat

The cat soft palate is shorter and less mobile than the dog's and sits closer to the larynx. The cat is an obligate nasal breather to a greater degree than the dog, so palatal length and position matter for airflow. The general muscle arrangement is the same as in the dog, but the cat's smaller oropharynx means that small changes in palatal thickness have proportionally larger effects on the airway.

Horse

The horse is the species where the soft palate has the most clinical importance. The equine larynx is intranarial, meaning the larynx sits partly within the nasopharynx and the soft palate wraps around it. This arrangement means the horse breathes through the nose and the soft palate is normally positioned dorsal to the larynx. The horse cannot breathe through its mouth, so displacement of the soft palate obstructs the airway.

Intermittent dorsal displacement of the soft palate (iDDSP) is a common cause of poor performance in racehorses. Laryngeal tie-forward surgery reduced the presence of iDDSP by 75% and the presence of palatal instability by 23% on overground endoscopy, and increased the number of horses that raced by 22% [13]. Soft palate thermocautery performed concurrently with laryngeal tie-forward showed no additional reduction in iDDSP prevalence [13].

The equine soft palate muscles have a low proportion of type 1 fibers. The palatopharyngeus, palatinus and levator veli palatini, which are innervated by the pharyngeal branch of the vagus, have significantly fewer type 1 fibers than the tensor veli palatini [6]. Mean fiber diameters are significantly smaller in type 1 than type 2 fibers in all muscles except the palatinus [6]. This fiber-type profile is consistent with a muscle group built for fast, phasic activity rather than sustained postural tone.

Body condition affects the equine soft palate. Increased body condition score leads to an increased mean soft palate angle and increased median basihyoid depth on computed tomography [14]. This is relevant because obesity is associated with obstructive sleep apnea in humans and with BOAS in dogs, and the horse data suggest a similar mechanical relationship [14].

Pig

The pig has a long soft palate that extends caudally toward the epiglottis. The pig is used as a model in airway and soft palate research because its anatomy is intermediate between the dog and the horse. The palatine tonsil is prominent in the pig, and the soft palate is a major site of lymphoid tissue.

Ruminant

The ruminant soft palate is short. In the goat, the soft palate forms the caudal continuation of the hard palate and extends from the level of the caudal border of the last upper molar tooth to terminate caudally against the base of the epiglottis [1]. This short palate is part of the ruminant's ability to regurgitate and rechew food. The soft palate does not need to be long because the ruminant's feeding mechanism relies on the tongue and the rumen, not on a long velum.

The collared peccary, a Tayassuidae species, has a pair of soft palate tonsils separated by a median raphe, with a keratinized squamous stratified epithelium and conical projections in the lamina propria after epithelial removal [2]. This is a useful reminder that even within the pig-like mammals the soft palate shows structural variation.

Function: Swallowing, Airway Protection and Speech

The soft palate has three main functions in mammals. It separates the nasal and oral cavities during swallowing, it protects the airway during swallowing, and it helps regulate airflow between the nasopharynx and oropharynx.

Swallowing

During swallowing, the soft palate is elevated and pulled dorsally to contact the dorsal pharyngeal wall. This seals the nasopharynx so that food and liquid do not enter the nose. The levator veli palatini lifts the palate, the tensor tenses it, and the palatoglossus and palatopharyngeus narrow the pharyngeal opening. The larynx moves rostrally and the epiglottis folds over the glottis. In the horse, the intranarial larynx means the soft palate must be displaced dorsally and rostrally to allow the bolus to pass, which is why iDDSP causes such dramatic signs.

Airway protection

The soft palate is part of the airway protection system. In the dog and cat, the soft palate and the epiglottis interlock to protect the larynx during swallowing. In the horse, the soft palate wraps around the intranarial larynx and forms a seal that separates the oral cavity from the airway. When this seal fails, as in iDDSP, the horse makes an abnormal respiratory noise and cannot perform.

Speech

Speech is a human specialization. In humans, the soft palate is actively elevated and tensed to modulate airflow through the nose and mouth, which changes the acoustic properties of the vocal tract. In most domestic mammals the soft palate is passive during vocalization and is moved by pressure changes and by the tongue and larynx. The comparative note is that the same muscles that humans use for speech are present in animals, but their function is primarily swallowing and airway protection.

Clinical Relevance, Limitations and Common Mistakes

The soft palate is a common site of disease in veterinary practice. In dogs, elongated soft palate is a major component of BOAS, and surgical shortening by staphylectomy or folded-flap palatoplasty is a standard treatment. Both techniques shorten the palate and reduce its volume, and neither has been shown to be clearly superior in exercise tolerance outcomes [7][8]. The choice of surgical instrument matters for tissue damage. In a randomized trial, staphylectomy with Onemytis Airplasma was less invasive than CO2 laser, causing reduced collateral tissue damage on histology and immunohistochemistry, and the surgery was significantly shorter [15].

In horses, iDDSP is a performance-limiting condition, and laryngeal tie-forward is an effective surgical treatment [13]. Soft palate thermocautery does not add benefit when performed with laryngeal tie-forward [13]. Body condition score is a modifiable factor, and increased body condition score is associated with increased soft palate angle and basihyoid depth [14].

Common mistakes in understanding the soft palate include treating it as a purely passive structure, ignoring its sensory innervation, and assuming that all species have the same palatal length and mobility. The soft palate has active muscles, a rich sensory supply, and species-specific geometry. In the dog, denervation-like changes are part of elongated soft palate disease [11][12]. In the horse, muscle fiber type and body condition both affect palatal position [6][14]. In the goat, the soft palate is short and ends at the epiglottis [1].

Limitations of the current knowledge base include the lack of detailed innervation maps for the levator veli palatini and palatopharyngeus in many species [4], the reliance on animal models for developmental studies [3], and the fact that most surgical outcome data come from specific breeds and techniques. Individual cases need a veterinarian for diagnosis and treatment.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Frequently Asked Questions

What is the velum palate?

The velum palate is the soft palate, a musculoaponeurotic shelf that separates the nasopharynx from the oropharynx. It hangs from the caudal edge of the hard palate and contains five paired muscles.

What are the five paired muscles of the soft palate?

The five paired muscles are the tensor veli palatini, levator veli palatini, palatoglossus, palatopharyngeus, and musculus uvulae. Each has a distinct origin, insertion, innervation and action.

What nerve supplies the soft palate muscles?

The tensor veli palatini is supplied by a branch of the mandibular nerve. The levator veli palatini and palatopharyngeus are probably dually innervated by the lesser palatine nerve and the pharyngeal plexus. The palatoglossus is supplied by superior branches of the glossopharyngeal and vagus nerves.

Why is the equine larynx intranarial?

The equine larynx sits partly within the nasopharynx, and the soft palate wraps around it. This arrangement lets the horse breathe through the nose and separates the oral cavity from the airway.

What is dorsal displacement of the soft palate in horses?

Dorsal displacement of the soft palate is a condition where the soft palate moves above the epiglottis and obstructs the airway. It is a common cause of poor performance in racehorses and is treated with laryngeal tie-forward surgery.

What is elongated soft palate in dogs?

Elongated soft palate is a condition where the soft palate is abnormally long and thick, obstructing the airway. It is a major component of brachycephalic obstructive airway syndrome and is treated by surgical shortening.

Is the soft palate active or passive in animals?

The soft palate is largely passive in most domestic mammals. It is displaced by pressure changes and by the tongue and larynx during swallowing, while humans actively elevate it for speech.

How does the soft palate protect the airway?

During swallowing, the soft palate is elevated to seal the nasopharynx, and the larynx moves rostrally with the epiglottis folding over the glottis. This prevents food and liquid from entering the airway.