Temporal and infratemporal fossae

Overview and topographic anatomy

General information

  • The entire temporal area consists of 2 fossae divided by the zygomatic arch

Temporal fossa

  • Related to the temple of the head

  • Communicates with the infratemporal fossa beneath the zygomatic arch

Infratemporal fossa

  • An irregularly shaped fossa inferior and medial to the zygomatic arch

  • Communicates with the pterygopalatine fossa at the pterygomaxillary fissure

Figure 7-1

Borders of the temporal fossa

Overview

Border Structures
Superior
  • Superior temporal line

  • Inferior temporal line

Inferior
  • Zygomatic arch (laterally)

  • Infratemporal crest of greater wing of sphenoid (medially)

Anterior
  • Frontal process of the zygoma

  • Zygomatic process of the frontal bone

Posterior
  • Supramastoid crest

  • Posterior portion of superior temporal line (which arches inferiorly to the supramastoid crest)

Medial
  • Frontal

  • Greater wing of the sphenoid

  • Squamous part of the temporal

  • Parietal

Lateral Temporal fascia

Muscles

  • Temporalis

Arteries

  • Superficial temporal

  • Middle temporal

  • Anterior and posterior deep temporal

Veins

  • Superficial temporal

  • Middle temporal

  • Anterior and posterior deep temporal

Nerves

  • Anterior and posterior deep temporal

  • Auriculotemporal

  • Temporal branches of facial

  • Zygomaticotemporal

Figure 7-2

Contents of the temporal fossa

Overview

TEMPORALIS
Origin Insertion Main Actions Nerve Supply Comments
Entire temporal fossa—along the inferior temporal line, including the temporal fascia Coronoid process—along the apex, anterior and posterior borders, medial surface extending inferiorly on the anterior border of the mandibular ramus (temporal crest) to the 3rd molar tooth
  • Elevates mandible

  • Retrudes mandible (posterior fibers)

  • Aids in lateral excursion of the mandible

Anterior and posterior deep temporal branches from the anterior division of the mandibular division of the trigeminal n. (anterior deep temporal may branch from the buccal n., and the posterior deep temporal may branch from the masseteric n.) The main postural muscle—maintains the mandible in rest position

Figure 7-3

Vascular supply

ARTERIAL SUPPLY
Artery Source Course
Superficial temporal A terminal branch of the external carotid a. that arises within the parotid gland
  • Within the substance of the parotid gland, it gives off a transverse facial a.

  • Emerges from the superior part of the parotid gland immediately posterior to the temporomandibular joint and anterior to the external auditory meatus

  • Passes superficially to the root of the zygomatic arch just anterior to the auriculotemporal n. and the auricle

  • Immediately superior to the root of the zygomatic arch, it gives rise to the middle temporal a. that pierces deep into the temporalis fascia and muscle

  • As it continues to pass superiorly, it divides into anterior and posterior branches

Middle temporal Anterior branch(es) off the superficial temporal a. after it passes superiorly to the root of the zygomatic arch Passes deep into the temporalis fascia and temporalis m., where it anastomoses with the anterior and posterior deep temporal vessels
Anterior and posterior deep temporal Branches of the 2nd part of the maxillary a.
  • Pass between the skull and the temporalis m.

  • Supply the temporalis throughout their course

  • While ascending, they anastomose with the middle temporal a.

Figure 7-4

VENOUS DRAINAGE
Vein Course
Superficial temporal
  • Begins at the vertex and lateral aspect of the skull

  • Forms a venous plexus along the scalp by communicating with the supraorbital, posterior auricular, occipital vv., and corresponding veins from the opposite side

  • Forms an anterior and a posterior branch of the superficial temporal v. that pass inferiorly immediately anterior to the artery

  • A middle temporal v. joins the superficial temporal before the vessel passes inferiorly to the root of the zygomatic arch

  • Enters the parotid gland, where it receives the transverse facial v.

  • Joins the maxillary v. to form the retromandibular v.

Middle temporal
  • Arises deep within the temporalis m. and fascia

  • Within the temporalis m. and fascia, it anastomoses with the anterior and posterior deep temporal vessels

  • Joins the superficial temporal a. immediately before it passes inferiorly to the root of the zygomatic arch

Anterior and posterior deep temporal
  • Drain into the pterygoid plexus of veins

  • Also communicate with the middle temporal v.

Figure 7-5

Nerve supply

Nerve Source Course
Mandibular division of the trigeminal
  • The largest of the 3 divisions of the trigeminal n.

  • Created by a large sensory and small motor root that unite just after passing through the foramen ovale to enter the infratemporal fossa

  • Immediately gives rise to a meningeal branch and medial pterygoid branch before it divides into anterior and posterior divisions

  • The anterior division is smaller and mainly motor, with 1 sensory branch (buccal n.)

  • The posterior division is larger and mainly sensory, with 1 motor branch (mylohyoid n.)

Anterior and posterior deep temporal Arise from the anterior division of the mandibular division of the trigeminal n. Pass superiorly to the lateral pterygoid m. between the skull and the temporalis m. as they pass deep to the muscle to innervate it
Auriculotemporal Arises from the posterior division of the mandibular division of the trigeminal n.
  • Normally arises from 2 roots, between which the middle meningeal a. passes

  • Runs posteriorly just inferior to the lateral pterygoid and continues to the medial side of the neck of the mandible

  • While passing posteriorly to the mandible, it provides sensory innervation to the temporomandibular joint

  • Turns superiorly with the superficial temporal vessels between the auricle and the condyle of the mandible deep to the parotid gland

  • On exiting the substance of the parotid gland, it ascends over the zygomatic arch and divides into superficial temporal branches

Temporal branches of the facial Motor branches that arise in the substance of the parotid gland
  • Cross the zygomatic arch to the temporal region

  • Supply the muscles in the area, including the frontalis, anterior auricular, superior auricular, orbicularis oculi, procerus, and corrugator supercilii mm.

Zygomaticotemporal Maxillary division of the trigeminal n.
  • Arises from the zygomatic n. in the pterygopalatine fossa, and passes through the inferior orbital fissure to enter the lateral wall of the orbit and branches into the zygomaticotemporal and zygomaticofacial branches

  • Passes on the lateral wall of the orbit in a groove in the zygomatic bone, then through a foramen in the zygomatic bone to enter the temporal fossa region

  • Within the temporal fossa, it passes superiorly between the bone and the temporalis m. to pierce the temporal fascia superior to the zygomatic arch

  • Passes along the skin of the side of the scalp

Figure 7-6

Figure 7-7

Borders of the infratemporal fossa

Overview

Border Structure(s)
Superior
  • Infratemporal surface of the greater wing of the sphenoid (with the foramen ovale and foramen spinosum)

  • Infratemporal surface of the temporal bone

Inferior No anatomic floor—the boundary of the fossa ends where the medial pterygoid attaches to the mandible
Lateral Ramus of the mandible (medial surface)
Medial
  • Lateral pterygoid plate of the sphenoid (lateral surface)

  • Pyramidal process of the palatine bone

Anterior Posterior portion of the maxilla
Posterior
  • Styloid process

  • Condylar process of the mandible

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Feb 15, 2025 | Posted by in General Dentistry | Comments Off on Temporal and infratemporal fossae

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