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)

TASTE SENSATION OF THE TONGUE
The sense of taste is mediated by the following CNs:
■ VII
■ IX
■ X

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What are the Sensory innervation of the tongue?
sensss

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:
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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?
lymph

What are the relations of LINGUAL ARTERY, VEIN, AND SUBMANDIBULAR DUCT?
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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