Infratemporal fossa structure
- 1. INFRATEMPORAL FOSSA STRUCTURE Instructor : Dr. Ibtihag Siddig Student name : Fatemah Ibrahim 201608350
- 2. CONTENTS Introduction 01 Boundaries 02 Contents 04 Blood supply 05 Innervation 06 03 COMMUNICATIONS
- 3. The infratemporal fossa is the space beneath. The base of the skull, between the side wall of the pharynx and ramus of the mandible. It communicates with the temporal fossa through a gap deep to the zygomatic arch. It is also referred to as the parapharyngeal space or lateral pharyngeal space. INTRODUCTION 01
- 5. Boundaries 02 Roof: Formed by the infratemporal surface of the greater wing of the sphenoid. It is pierced by foramen spinosum and foramen ovale. Medial wall: Formed by lateral surface of the lateral pterygoid plate of the sphenoid. It is separ ated from the anterior wall by pterygomaxillary fissure. Lateral wall: Formed by the ramus of the mandible. Anterior wall: Formed by the infratemporal surface of the maxilla. It is separated from roof by inferior orbital fissure. Floor: Open and extends up to the level of the base of the mandible. Posterior wall: Formed by styloid process of the temporal bone.
- 7. CONTENTS 04 1.Muscles: Lateral pterygoid, medial pterygoid, and tendon of temporalis. 2.Blood vessels: Maxillary artery, maxillary vein, and pterygoid venous plexus. 3.Neural structures: Mandibular nerve, chorda tympani nerve, and otic ganglion.
- 8. MUSCLES LATERAL PTERYGOID It is a short, thick conical muscle with its apex pointing backwards. It passes backwards and slightly laterally from the roof and medial wall of the fossa to the neck of the mandible.
- 9. • Relations Structures emerging at the upper border: • Deep temporal nerves (two in number) • Masseteric nerve. Structures emerging at the lower border: • Inferior alveolar nerve and artery. • Lingual nerve. • Middle meningeal artery
- 10. MUSCLES MEDIAL PTERYGOID • The medial pterygoid is a thick quadrilat eral muscle and consists of two heads: superficial and deep. • The medial pterygoid is supplied by a nerve to medial pterygoid, a branch. from the main trunk of the mandibular nerve.
- 11. Superficial : 1.Lingual nerve. 2.Inferior alveolar nerve. 3.Inferior alveolar vessels. Deep: 1.Levator palati and tensor palati muscles. 2.Superior constrictor of pharynx. 3.Styloglossus and stylopharyngeus muscles. • Relations
- 12. BLOOD VESSELS 1. MAXILLARY ARTERY 2. MAXILLARY VEIN 3. PTERYGOID VENOUS PLEXUS NEURAL STRUCTURES 1. MANDIBULAR NERVE AND ITS BRANCHES 2. CHORDA TYMPANI NERVE 3. OTIC GANGLION.
- 13. Blood supply 05 The vascular supply of the infrate- mporal fossa comes singularly from the maxillary artery. The branches have been divided i nto three sections for clarity and are categorized according to the anatomical structure closest to them, including: •mandibular part •the pterygoid part •the pterygopalatine part
- 14. The first part (mandibular part) contains several arterial branches, such as the deep auricular, the anterior tympanic, the middle and accessory meningeal arteries and the inferior alveolar artery. The branches pass between the mandible and the sphenomandibular ligament. The second part (pterygoid part ) contains vessels that pass obliquely and anterosuperiorly between the mandibular ramus and the temporalis muscle. The list of vascular constituents includes the anterior and posterior deep temporal artery, the masseteric artery, the pterygoid artery and the buccal artery The third part (the pteryogopalatine ) holds the posterior superior alveolar artery that runs from the infratemporal fossa to the pterygopalatine fossa via the pterygomaxillary fissure.
- 15. MAXILLARY VEIN AND PTERYGOID VENOUS PLEXUS It is a short venous trunk, which accompanies the first part of the maxillary artery. • Pterygoid Venous Plexus It is a network of very small veins that lie around and within the lateral pterygoid muscle. • Maxillary Vein which leads infratempora foggy to communicate with Cavernous sinus
- 16. Innervation 06 • The mandibular nerve contribute their branches. • Mandibular nerve providing nerves from both its an terior and posterior divisions.
- 18. CHORDA TYMPANI NERVE The chorda tympani nerve is the slender branch of facial nerve.
- 19. OTIC GANGLION It is a small parasympathetic ganglion connected to the mandibular division of trigeminal nerve and provides a relay station to the secretomotor fibres to the parotid gland. Topographically , it is intimately related to the mandibular nerve but functionally it is related to glossopharyngeal nerve.
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- 21. REFRENCES :