Your information about Tongue

The tongue is derived from which Structures? 
The tongue is derived from the first four pharyngeal arches
and is innervated by associated nerves of those arches: arch 1 (V), arch 2 (VII), arch 3 (IX), and arch 4 (X).

What is the Motor Supply of Tongue?
Motor Supply of Tongue is by CN XII ( Hypoglossal Nerve)

What is the Sensory Supply of Tongue?
Sensory Supply of Tongue is by CN V3, IX, X ( Mandibular Nerve, Glossopharyngeal Nerve and Vagus Nerve)

Taste Sensation from the Tongue are carried by Which Nerves? 
Taste Sensation from the Tongue are carried by CN VII, IX, X  (Facial Nerve, Glossopharyngeal Nerve and Vagus Nerve)

The sense of taste is mediated by the following CNs:
■ IX
■ X


What are the Sensory innervation of the tongue?

What is the Course of CHORDA TYMPANI NERVE? 
This nerve is part of the structure of the facial nerve (CN VII).
■ Nucleus of solitary tract (accepts taste fibers).
■ Superior salivatory nucleus (parasympathetic to submandibular, sublingual glands).
■ Chorda tympani nerve arises from the geniculate ganglion.
■ Emerges from petrotympanic fissure.
■ Crosses the medial surface of the tympanic membrane.
■ Joins the lingual nerve (of V3) in the infratemporal fossa.

What are the Components of Chorda Tympani? 
Taste (pathway): 
■ Anterior two-thirds of tastebuds.
■ Chorda tympani (travels with lingual nerve).
■ Cell bodies are located in the geniculate ganglion (within facial          canalor petrous temporal).
Preganglionic parasympathetic
■ Synapse in submandibular ganglion.

Important Structures on The Inferior Surface of Tongue: 
1: Lingual frenulum: vertical fold in the midline.
2: Plica fimbriata: fold of mucous membrane, lateral to the frenulum
3: Wharton’s and Rivian ducts: openings of the submandibular and sublingual glands.

Diagram of taste pathways:

What are different Types Of Taste Buds on the Tongue? 
1: Filiform papillae: Rough texture of tongue; found in rows; avascular; most numerous papillae of tongue; do not contain tastebuds.
2: Fungiform papillae: Mushroom-shaped; scattered among filiform papillae; usually contain tastebuds.
3: Circumvallate papillae: Seven to nine large circular structures with tastebuds; serous-only salivary glands within (von Ebner’s glands).
4: Foliate papillae: On lateral surface of tongue in ridges; rudimentary and nonfunctional.

What are the Different Surface Components of Tongue?
Foramen cecum: Upper part of thyroglossal duct.
Sulcus terminalis
Lingual tonsils

Location and Type of Glands on Tongue:
1: Mucous (back, front, and sides)
2: Serous (posteriorly)
3: Anterior lingual glands (mixed seromucous glands)

What is The Lymph Drainage of Tongue?

The relationships to the hyoglossus muscle are:
■ Medial to the hyoglossus.
■ Lingual artery
■ Lateral to the hyoglossus.
■ Lingual vein
■ Lingual nerve
■ Submandibular duct
■ Hypoglossal nerve

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