Human AnatomyNMC Grounded

Maxillary Artery & Pterygopalatine Fossa: Branches & Clinical Anatomy

BD Chaurasia Human Anatomy Vol 3 · Head & Neck; Wheeler's Dental Anatomy

Verified Clinical DiagramBD Chaurasia Human Anatomy Vol 3 · Head & Neck; Wheeler's Dental Anatomy

High-Yield Clinical Pearls & Exam Keys

The Middle Meningeal Artery arises from the 1st part of the maxillary artery, enters the cranial cavity through the Foramen Spinosum, and lies deep to the Pterion.

Fracture of the pterion typically lacerates the anterior division of the Middle Meningeal Artery, causing an acute Extradural (Epidural) Hematoma.

The Sphenopalatine Artery is the terminal branch of the 3rd part of the maxillary artery and is known as the 'artery of epistaxis'.

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Pterygopalatine Fossa Clinical Communications

Key #1

Foramen Rotundum: Transmits Maxillary Nerve (V2) to the middle cranial fossa

Key #2

Pterygomaxillary Fissure: Transmits 3rd part of Maxillary Artery from infratemporal fossa

Key #3

Sphenopalatine Foramen: Transmits Sphenopalatine Artery & Nasopalatine Nerve to nasal cavity

Three Segments of the Maxillary Artery

Part of Maxillary Artery	Anatomical Course	Key Terminal Branches & Clinical Correlation
1st Part (Mandibular)	Deep to neck of mandible, along lower border of lateral pterygoid	Middle Meningeal Artery (passes through Foramen Spinosum; lacerated in extradural hematoma) & Inferior Alveolar
2nd Part (Pterygoid)	Superficial or deep to lower head of lateral pterygoid	Muscular branches (Masseteric, Deep Temporal, Pterygoid, Buccal) supplying masticatory muscles
3rd Part (Pterygopalatine)	Enters pterygopalatine fossa via pterygomaxillary fissure	Sphenopalatine Artery (artery of epistaxis), Greater Palatine, Posterior Superior Alveolar, Infraorbital

Interactive Clinical Vignette Practice

Live Rule-Out Engine

Case Vignette #1NEET-PG Calibrated

A 21-year-old cricketer is struck on the side of his temple by a ball. He loses consciousness momentarily, wakes up alert and conversational (lucid interval), but 2 hours later develops severe headache, vomiting, and becomes comatose with an ipsilateral dilated pupil. Cranial CT shows a biconvex, lenticular hyperdense collection adjacent to the inner skull table. Which artery was lacerated?

ASuperficial temporal artery

BMiddle meningeal artery

CBridging cortical vein

DInternal carotid artery cavernous segment

Comprehensive Clinical & Pathophysiological Breakdown

**1. Origin & Topographical Anatomy** The Maxillary Artery is the larger terminal branch of the External Carotid Artery, arising behind the neck of the mandible within the parotid gland. It runs forward through the infratemporal fossa and terminates within the pterygopalatine fossa. **2. Three Anatomical Parts & Branches** 1. *First (Mandibular) Part*: Runs horizontal deep to the mandibular neck. Key branches include the **Deep Auricular**, **Anterior Tympanic**, **Middle Meningeal Artery** (enters cranial cavity via foramen spinosum to supply dura mater), and the **Inferior Alveolar Artery** (enters mandibular foramen with inferior alveolar nerve to supply mandibular teeth). 2. *Second (Pterygoid) Part*: Runs oblique superficial (or deep) to lateral pterygoid muscle. Gives muscular branches: deep temporal, pterygoid, masseteric, and buccal arteries. 3. *Third (Pterygopalatine) Part*: Enters pterygopalatine fossa via pterygomaxillary fissure. Gives: **Posterior Superior Alveolar Artery** (supplies maxillary molars/premolars and maxillary sinus), **Infraorbital Artery**, **Greater Palatine Artery** (hard and soft palate), and **Sphenopalatine Artery** (the artery of epistaxis, terminating on nasal septum). **3. 🔬 Clinical Significance in Dentistry** * **Inferior Alveolar Nerve Block**: Accidental posterior injection risks penetrating the inferior alveolar artery or maxillary artery trunk, causing painful pterygomandibular space hematoma. * **Le Fort Osteotomies**: Surgical mobilization of the maxilla risks severe arterial hemorrhage from the descending palatine or terminal maxillary branches. **4. 📖 Standard Textbook Reference** * *BD Chaurasia's Human Anatomy*, 8th Ed., Vol. 3: Head and Neck, Ch. 10 (Infratemporal Fossa & Pterygopalatine Fossa), pp. 142–158. * *Sicher and DuBrul's Oral Anatomy*, 8th Ed., pp. 312–326.

Viva Examiner Traps & Model Answers

Oral Exam Prep

What is the Pterion, and why is it a critical surgical and trauma landmark?

The Pterion is an H-shaped suture junction on the lateral skull vault where four bones meet: Frontal, Parietal, Squamous temporal, and Greater wing of Sphenoid. It overlies the anterior branch of the Middle Meningeal Artery.

Which foramen transmits the Middle Meningeal Artery into the skull?

The Foramen Spinosum in the greater wing of the sphenoid bone.

What is the source of severe intractable posterior epistaxis?

The Sphenopalatine Artery (terminal branch of the maxillary artery) entering the nasal cavity through the sphenopalatine foramen.

Additional Exam Practice Vignettes (1)

Case Vignette #2

Which branch of the maxillary artery passes through the sphenopalatine foramen to supply the posterior nasal septum and lateral nasal wall?

The Sphenopalatine Artery enters the nasal cavity through the sphenopalatine foramen as the terminal branch of the 3rd part of the maxillary artery.

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