---
title: "Development of the Tongue"
description: "Understand the embryological development of the tongue."
source: "The ENT Resident"
author: "Dr. Mausumi Das"
canonical_url: "https://www.theentresident.com/ent-notes-lectures/development-of-tongue"
categories: ["Oral Cavity and Salivary Glands"]
video: "https://www.youtube.com/watch?v=zbRmnVoeP3g"
image: "https://media.theentresident.com/og-images/development-of-tongue.png"
---

# Development of the Tongue

Understand the embryological development of the tongue. Watch the full video lecture on YouTube: https://www.youtube.com/watch?v=zbRmnVoeP3g

The tongue begins development **around the 4th week of intrauterine life**.

Development can be studied under 3 components:

1. **Mucous membrane**
2. **Muscles**
3. **Fibrous stroma**

---

### 🌱 Origin of the Mucous Membrane

- It develops from the **endoderm of the floor of the primitive pharynx**.

- Divided into two regions:
  - **Anterior two-thirds**
  - **Posterior one-third**
  
These regions have **different embryological origins**.

### 🧱 Role of Pharyngeal Arches

During the 4th week, six mesodermal **pharyngeal (branchial) arches** form.

>Mnemonic to Remember Layers from Outside In: **CAP**:  
**C**: Pharyngeal *Cleft* – ectoderm  
**A**: Pharyngeal *Arch* – mesoderm  
**P**: Pharyngeal *Pouch* – endoderm

---

### 👅 Development of Anterior Two-Third of the Tongue

Develops from the **first pharyngeal arch**, from:

- **Two lingual swellings** (paired)
- **Tuberculum impar** (unpaired midline swelling)

These swellings:
- Merge in the midline
- Form the **anterior two-thirds**
- Are separated from the floor of the mouth by the **alveololingual groove**

**🔹 Foramen Cecum and Thyroglossal Duct**

- A depression called the **foramen caecum** forms behind the tuberculum impar.
- It's a remnant of the **thyroglossal duct**, which gives rise to the **thyroid gland**.

---

### 👅 Development of Posterior One-Third of the Tongue

Develops from **second, third, and fourth arches** via:

- A **median swelling** called the **hypobranchial eminence**
- Divided into:
  - **Cranial part** (mostly from the 3rd arch)
  - **Caudal part** (from 4th arch)

**🧩 Key Features:**

- The cranial part grows forward, fusing with anterior tongue.
- The line of fusion is the **sulcus terminalis**.
- The caudal part forms the **epiglottis**.

---

### 📌 Summary of Development

| Tongue Region | Structure Involved | Pharyngeal Arch | Outcome |
| --- | --- | --- | --- |
| Anterior 2/3 | Lingual swellings + Tuberculum impar | 1st arch | Mucosa of anterior tongue |
| Posterior 1/3 | Cranial hypobranchial eminence | 3rd arch | Mucosa of posterior tongue |
| Epiglottis + Valeculae | Caudal hypobranchial eminence | 4th arch | Epiglottis, valleculae area |

---

### 🔌 Nerve Supply of Tongue and Its Developmental Basis

The **nerve supply of the tongue** reflects its embryological origin.

**🔹 Anterior Two-Third**

- General sensation: **Lingual nerve** (branch of V3 – 1st arch, post-trematic)
- Taste sensation: **Chorda tympani** (branch of facial nerve – 1st arch, pre-trematic)

**🔹 Posterior One-Third**

- General & taste sensation: **Glossopharyngeal nerve (CN IX)**
  - Nerve of the **3rd arch**

**🔹 Epiglottis and Valleculae**
- Supplied by **internal laryngeal nerve** (branch of superior laryngeal nerve, from vagus)
  - Nerve of the **4th arch**

---

## About This Note

This free ENT note on Development of the Tongue was written by Dr. Mausumi Das and is paired with a corresponding video lecture.

Canonical page of this note: https://www.theentresident.com/ent-notes-lectures/development-of-tongue

When citing or referencing this content, please credit The ENT Resident and link to the canonical page above.

## Related Notes by Category

- Oral Cavity and Salivary Glands: https://www.theentresident.com/ent-notes-lectures/category/oral-cavity-and-salivary-glands.md

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